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Particular pulse demodulator or detector

Subclass of:

375 - Pulse or digital communications

375316000 - RECEIVERS

Patent class list (only not empty are listed)

Deeper subclasses:

Class / Patent application numberDescriptionNumber of patent applications / Date published
375341000 Maximum likelihood decoder or viterbi decoder 320
375343000 Correlative or matched filter 214
375342000 Locating predetermined portion of pulse 11
Entries
DocumentTitleDate
20130044839WIRELESS APPARATUS AND PROCESSING METHOD THEREOF - The present invention relates to a wireless apparatus and the processing method thereof. The wireless apparatus according to the present invention comprises a demodulating circuit, a computing circuit, and a compensating circuit. The demodulating circuit receives and demodulates an input signal for producing a baseband signal. The computing circuit is coupled to the demodulating circuit and receives the baseband signal. It performs inner product on the baseband signal for producing an output signal. The compensating circuit is coupled to the computing circuit, and produces and transmits a compensation signal to the demodulating circuit according to the output signal for adjusting the demodulating circuit. Accordingly, by means of the computing circuit according to the present invention, erroneous outputs sent to the compensation circuit due to erroneous judgment of a signal received with large frequency deviation can he avoided effectively, and hence enhancing the efficiency of the wireless apparatus.02-21-2013
20130044840DIGITAL BROADCAST RECEIVING APPARATUS AND DIGITAL BROADCAST RECEIVING METHOD - Disclosed is a digital broadcast receiver which includes a TS processing unit. The TS processing unit comprises reference packet detection units (02-21-2013
20090147887METHOD OF CALCULATING SOFT VALUE AND METHOD OF DETECTING TRANSMISSION SIGNAL - The present invention relates to a method of calculating a soft value and a method of detecting a transmission signal. The present invention estimates a channel on the basis of a received signal and rearranges a plurality of data streams. Further, a plurality of substitute vectors are selected from the rearranged data streams and a metric corresponding to each of the substitute vector is calculated. Further, a threshold value is calculated from a metric calculated for each of the substitute vectors and a soft value of each bit of a transmission signal is calculated from the metric and threshold value corresponding to each of the substitute vectors.06-11-2009
20130028353METHOD AND DEVICE FOR ITERATIVE BLIND WIDEBAND SAMPLING - Devices and methods are for iteratively sampling a wideband signal in order to recover one or more narrowband signals are disclosed. In one aspect, a wideband signal is received and the signal is sampled using a sampling device, which includes an amplifier with an initial gain level, to produce a plurality of sampled signals. A first set of narrowband signals may be recovered from the plurality of sampled signals. Then, the wideband signal is re-sampled to produce a second plurality of sampled signals. The re-sampling includes increasing the gain of the amplifier to a second level and suppressing a component of the wideband signal. A second set of narrowband signals may then be recovered from the second set of sampled signals.01-31-2013
20130028355DEMODULATION USING SERIAL LOCALIZATION WITH INDECISION - A receiver includes a constellation processing module and a plurality of demodulation stages. The constellation processing module groups points of a constellation associated with a transmitted signal into a plurality of subsets, were at least two adjacent ones of the subsets have one or more common constellation points so that the at least two adjacent subsets overlap. The constellation processing module also determines a centroid-based value for each of the subsets of constellation points and groups the centroid-based values into one or more sets. Each of the demodulation stages except for the last demodulation stage localizes a search for a final symbol decision using the set of centroid-based values input to or selected by the demodulation stage as constellation points. The last demodulation stage determines the final symbol decision using the subset of constellation points input to or selected by the last demodulation stage.01-31-2013
20130028354Detecting a Transmitted OFDM Signal in a Receiver Having at Least Two Receiver Branches - A transmitted OFDM signal is detected in a receiver of a wireless communication system. The receiver has at least two receiver branches, each comprising an antenna, a front end receiver, a Discrete Fourier Transform unit, and a channel estimator. The receiver further comprises a detector for detecting received data symbols. The method comprises the steps of determining a system bandwidth associated with the transmitted signal; comparing the determined system bandwidth with a predetermined value; determining, if the system bandwidth is lower than the predetermined value, channel estimates separately for each branch, and detecting received data symbols from the received signals and corresponding channel estimates; and calculating, if the system bandwidth is higher than the predetermined value, a weighted sum of signals from each branch, determining a combined channel estimate, and detecting received data symbols from the weighted sum and the combined channel estimate.01-31-2013
20120163510WIRELESS COMMUNICATION DEVICES AND METHODS - Provided are wireless communication methods. The wireless communication method receives communication information through a plurality of antennas, generates a plurality of beam directions, selects one of the beam directions on the basis of the received communication information, and performs communication using the selected beam direction. Communication information received through the unselected beam directions among the beam directions are ignored.06-28-2012
20130044838LOAD TOLERANT VOLTAGE CONTROLLED OSCILLATOR (VCO), IC AND CMOS IC INCLUDING THE VCO - A voltage controlled oscillator (VCO), IC and CMOS IC including the VCO. The VCO includes an LC tank circuit, a pair of cross-coupled devices connected to the tank circuit and driving a pair of buffers. Each of the pair of cross-coupled devices includes a field effect transistor (FET) with an independently controllable body, e.g., the surface layer of a Silicon on Insulator (SOI) chip or the surface well of a multi-well chip. Diodes in the multi-well structure are biased off in each device. The tank circuit is coupled to the buffers solely through the FET drain to body capacitance02-21-2013
20090196379MULTIPLE-INPUT MULTIPLE-OUTPUT SIGNAL DETECTORS BASED ON RELAXED LATTICE REDUCTION - System and methodologies for reduced-complexity signal detection and decoding in a wireless communication system are provided herein. Systems and methodologies presented herein can utilize a relaxed form of the Lenstra-Lenstra-Lovasz (LLL) lattice reduction algorithm to reduce the complexity of lattice reduction operations in the context of MIMO detection. Additional systems and methodologies presented herein can apply lattice reduction in the context of a maximum likelihood (ML) detector for spherical or elliptical lattice space-time (LAST) codes.08-06-2009
20090196377CORRELATION SYSTEM AND METHOD FOR GNSS RECEIVER - A correlation system for a GNSS receiver uses an FFT engine to perform correlation and post-FFT operation. The FFT engine executes FFT operation to an input data stream so as to generate a frequency-domain correlation with frequency-domain C/A code and IFFT operation to the frequency-domain correlation result to generate post correlation data for each hypothesis, and executes FFT operation to the post correlation data of a selected hypothesis to generate a post-correlation FFT result in a programmable TDM manner. In the present invention, in addition to the FFT engine, some components such as a magnitude calculation unit and memory are shared by a correlation stage and a post-correlation stage. Therefore, hardware complexity can be reduced.08-06-2009
20100150276Digital Radio Tagging Using an RF Tuner Accessory - An accessory having an RF tuner for digital radio, such as HD radio, can be in communication with a media player such as a portable media device (“PMD”). The user can be given the ability to command the accessory to provide raw digital data, the ability to scan only for stations having digital audio content (or for all available stations), the ability to provide station lists of stations having digital audio content (or all available stations), and the ability to request and store metadata beyond that for stations actually being listened to provide enhanced search capabilities. Enhanced metadata and searching can provide the listener the ability to refine station choices without having to listen at length to any particular station, and further can facilitate tagging broadcast tracks for subsequent access and/or purchase.06-17-2010
20110194654DECODING APPARATUS, DECODING METHOD, AND COMPUTER-READABLE STORAGE MEDIUM - Provided are a decoding apparatus and method. The decoding apparatus includes a repository and a configuration unit. The repository stores a plurality of functional units having an input port and an output port which are respectively represented as tokens. The configuration unit receives decoder description which includes an identifier of at least one of the functional units and connection relationship information between the functional units, selects each functional unit corresponding to the received identifier from the repository, and connects the selected functional units by using the token to configure a variable decoder. The decoding apparatus and method defines the connection relationships between a plurality of functional units that configure a decoder, and thus can quickly and dynamically configure a decoder suitable for various encoding schemes. Accordingly, the decoding apparatus and method enable to easily verify suitability in each level of encoding, decoding and standardization and achieve the concentration of information, thereby accelerating the progress and standardization of technologies.08-11-2011
20110194653RECEIVER AND RECEPTION METHOD FOR LAYERED MODULATION - A receiver for receiving a layer-modulated signal includes: a base layer decoding unit configured to calculate a bit metric including code bit information of a base layer based on the reception signal and decode an information bit of the base layer; and at least one enhancement layer decoding unit configured to decode an information bit of an upper layer of a lower layer based on the decoding results of the lower layer, wherein the base layer decoding unit and the at least one enhancement layer decoding unit are sequentially connected according to the order of the corresponding layers.08-11-2011
20110194652PHYSICAL LAYER CIRCUIT - Provided is a physical layer circuit. Upon detecting a connection recognition signal from an output of a differential input terminal, a first detection circuit outputs a first control signal for allowing an upper layer to output a power supply control signal for turning on a power supply of each of a receiver circuit and a recovery conversion circuit. Upon detecting “input absent” based on the bit configuration of parallel data, a second detection circuit outputs a second control signal for allowing the upper layer to output the power supply control signal for turning off the power supply of each of the receiver circuit and the recovery conversion circuit. A control circuit turns off a power supply of the first detection circuit when the second detection circuit detects “input present”, and turns on the power supply of the first detection circuit when the second detection circuit detects “input absent”.08-11-2011
20090122920DIGITAL BROADCASTING TRANSMISSION/RECEPTION DEVICES CAPABLE OF IMPROVING A RECEIVING PERFORMANCE AND SIGNAL PROCESSING METHOD THEREOF - Disclosed is a digital broadcasting transmission/reception system having an improved reception performance and in a signal-processing method thereof. A digital broadcasting transmitter comprises a TS stream generator for inputting robust and normal packets having stuff bytes in predetermined positions and generating dual TS stream by inserting the robust packets between the normal packets; a randomizer for randomizing the dual TS stream; a stuff byte exchanger for replacing the stuff bytes of a randomized data streams from the randomizer to a predetermined known data; and an encoder for encoding a data streams to which the known data is inserted. Accordingly, the present invention detects the known data from a signal received from a reception side and uses the detected known data for synchronization and equalization, so that the digital broadcasting reception performance can be improved at poor multipath channels.05-14-2009
20090141833MULTI-CHANNEL TUNING RECEIVER AND MULTI-CHANNEL TUNING METHOD THEREOF - Provided are a multi-channel tuning receiver, including: a broadband radio frequency (RF) tuner to receive a broadband signal, divide the broadband signal into a plurality of signals, tune the divided signals, combine the tuned signals into a single signal, and output the combined single signal; an analog-to-digital (A/D) converter to convert the combined single signal to digital signal; a channelizer to extract only a bonded channel from the digital signal; and a plurality of demodulators to demodulate the bonded channel, and a multi-channel tuning method thereof.06-04-2009
20090290660Pseudo Noise Coded Communication Systems - Systems, apparatus and methods for acquiring code phase and multipath channel models in communication device. A fast Walsh transform engine is used to acquire a pseudo noise code phase and the pseudo noise code bit rate of a radiofrequency signal that has been broadcast. Multipath filter coefficients from the pseudo noise code phase and the pseudo noise code bit rate are recovered. A pseudo noise generator is initialized with the pseudo noise code phase acquired during the fast Walsh transform step. The pseudo noise code phase and pseudo noise code bit rate are tracked by a phase locked loop so that communication with the radiofrequency signal is maintained. Then, the received noise code phase and pseudo noise code bit rate are despread so that any data in the radiofrequency signal is recovered.11-26-2009
20100074377COMMUNICATION DEVICE FOR RECEIVING AND TRANSMITTING OFDM SIGNALS IN A WIRELESS COMMUNICATION SYSTEM - A communication device for receiving transmitted orthogonal frequency division multiplexed (OFDM) signals in a wireless communication system. The device includes a plurality of antenna elements to receive a plurality of OFDM signals transmitted from a transmitter via a plurality of transmission channels. The device performs channel estimation processing and decoding processing on the plurality of received OFDM signals, and weights the plurality of received OFDM signals by weight vectors chosen to improve a performance of the plurality of received OFDM signals.03-25-2010
20100074376SPHERE DECODING METHOD APPLIED TO MULTI-INPUT MULTI-OUTPUT (MIMO) CHANNEL - A sphere decoding method applied to a MIMO channel is provided. Multiple constellation points of an n03-25-2010
20100074375SPHERE DECODING METHOD APPLIED TO MULTI-INPUT MULTI-OUTPUT (MIMO) CHANNEL - A sphere decoding method applied to a MIMO channel is provided. Multiple constellation points of an n03-25-2010
20130077719DIVERSITY SCHEMES FOR 2-D ENCODED DATA - A method for communication includes receiving a signal carrying data including multiple data units using at least first and second reception channels. The data units are encoded with first and second codes such that, when the data units are arranged in rows and columns, the rows are encoded with the first code and the columns are encoded with the second code. The data units received by the first and second reception channels are selectively combined to produce composite data, which includes at least one row or column that includes a first data unit received from the first reception channel and at least a second data unit received from the second reception channel. The first and second codes for the composite data are decoded, including the at least one row or column, so as to reconstruct the data.03-28-2013
20130077718SYSTEM AND METHOD FOR DETECTING A FRAME FORMAT - A method for detecting a format of a frame in a communication system is presented. An embodiment of the method includes receiving the frame comprising a plurality of orthogonal frequency division multiplexing (OFDM) symbols. The plurality of OFDM symbols may include at least one signal field symbol. The method further includes determining a modulation associated with the at least one signal field symbol. The modulation may be a first modulation or a second modulation. Also, the method includes estimating a position of the at least one signal field symbol among the plurality of symbols, and extracting a coding rate of the received frame. The method then includes detecting the format of the received frame based on the determined modulation and the estimated position of the at least one signal field symbol, and the extracted coding rate of the received frame.03-28-2013
20130077717APPARATUS AND METHODS FOR PERFORMING SEQUENCE DETECTION - An apparatus for performing sequence detection on a stream of incoming bits comprises a memory and circuitry coupled to the memory. The circuitry is operative, for each bit of the stream of incoming bits, to overwrite a first binary number presently stored in the memory with a second binary number, and to provide an output indicative of when the second binary number is equal to a predetermined value. The output indicative of when the second binary number is equal to the predetermined value is, in turn, indicative of when a binary number constructed by the stream of incoming bits is divisible by a prescribed integer.03-28-2013
20090052584Selective Signal Demodulation Method and Apparatus - Signal quality estimation and demodulation are tailored to the received signal quality. According to one embodiment, a received signal is processed by determining a first set of combining weights based on a first impairment covariance estimate derived assuming a low signal quality environment. A second set of combining weights is determined based on a second impairment covariance estimate derived assuming a high signal quality environment. A metric is determined corresponding to the difference between symbol estimates derived from the second set of combining weights and hard symbol decisions. The received signal is demodulated based on the second set of combining weights if the metric satisfies a threshold indicating high signal quality and otherwise based on the first set of combining weights.02-26-2009
20130039446FREQUENCY-DOMAIN FILTERING FOR CHANNEL ESTIMATION IN COMMUNICATIONS SYSTEMS - A method of channel estimation includes receiving a signal after transmission over a media having a plurality of sub-carriers in a frequency band. The signal is preprocessed including performing a fast Fourier transform (FFT) to generate a plurality of frequency-domain samples. Channel estimating is applied to the plurality of frequency-domain samples using (i) least squares (LS) estimation, wherein the LS estimation generates intermediate LS channel estimates for each of the sub-carriers, and (ii) frequency-domain filtering and scaling the intermediate LS channel estimates. The frequency-domain filtering uses a common frequency-domain filter consisting of a single filter coefficient vector having a plurality of frequency-domain filter coefficients to generate refined channel estimates for each of the plurality of sub-carriers.02-14-2013
20080198950APPARATUS AND METHOD FOR DETECTING ABNORMAL SIGN - There is provided with a method including: acquiring string data made up of a plurality of monitoring items from an apparatus to be monitored at predetermined or arbitrary time intervals; storing each acquired string data in a storage temporarily; calculating an average and variation for each of the monitoring items and correlation information indicating a correlation between the monitoring items by using each string data stored in the storage; normalizing the acquired string data by using the average and the variation of each monitoring item; calculating a distance from the correlation information for normalized string data by carrying out a computation using the normalized string data and the correlation information; and deciding whether or not there is an abnormal sign in the apparatus to be monitored depending on whether or not calculated distance falls within a confidence interval set in advance for a certain probability distribution.08-21-2008
20100046675METHODS AND APPARATUS FOR TRANSMITTING LAYERED AND NON-LAYERED DATA VIA LAYERED MODULATION - A media access control (MAC) layer controller can manage base layer data and enhancement layer data in a layered modulation system. The MAC layer controller can process both base layer data and enhancement layer data and map the encoded symbols to a layered modulation constellation when both are present. If data for one of the layers terminates, then the MAC layer controller can generate and supply predetermined stuffing data to the layer lacking additional data. The MAC layer controller can send a control signal to the physical layer hardware to cause the hardware to map the layered signals having the stuffing data to a modified signal constellation. The MAC controller can also generate an overhead message that indicates the occurrence of the stuffing data. The receiver can receive the overhead message and can use the information to configure the receiver for the layered modulation constellation or the modified signal constellation.02-25-2010
20100046674System and Method for Frequency Translation With Harmonic Suppression Using Mixer Stages - A method for generating phase signals includes triggering a phase register to output a binary number stored in the phase register, wherein the phase register is triggered based at least in part on a voltage signal provided by a voltage controlled oscillator. The method also includes providing an input signal to a decoder, wherein the input signal is based at least in part on the binary number output by the phase register and the decoder is operable to generate phase signals in response to the input signals. The method further includes incrementing the binary number stored in the phase register and repeating the triggering and providing steps after the binary number is incremented.02-25-2010
20130034193method and device for demodulating complex carriers - A method and device for complex carrier demodulation are provided by the disclosure. The method includes: demodulating modulated signals using complex signals e02-07-2013
20100111231OFDM CHANNEL ESTIMATION METHOD AND APPARATUS - Smaller patterns of regularly-spaced pilot symbols are discerned from a larger pattern of irregularly-spaced pilot symbols transmitted in the time-frequency domain. Accordingly, the irregularly-spaced pilot symbols can be partitioned into at least two different groups of regularly-spaced pilot symbols in the time-frequency domain. Each group of regularly-spaced pilot symbols is individually processed with lower complexity and the results combined to generate an accurate time-frequency channel response estimate. According to an embodiment, a set of irregularly-spaced pilot symbols is transmitted over a time-frequency window. Channel response is estimated based on the pilot symbols by grouping the pilot symbols into subsets of regularly-spaced pilot symbols. An intermediate quantity is generated for each subset of regularly-spaced pilot symbols as a function of the pilot symbols included in the subset. The channel response is estimated over the time-frequency window as a function of the intermediate quantities.05-06-2010
20100322354TRANSMITTING METHOD, RECEIVING METHOD, TRANSMITTING DEVICE, RECEIVING DEVICE, TRANSMISSION APPARATUS AND TRANSMISSION SYSTEM - In current transmitting methods, an instantaneous interruption of a transmission data may occur at the time of switching a system. A sending method of the present invention is a sending method for transmitting a data string signal to a primary system and a backup system in which: a first periodic signal which becomes a reference signal and a second periodic signal with a longer cycle period than the first periodic signal are generated; a data string signal is synchronized with the first periodic signal; and the data string signal synchronized with the first periodic signal is multiplexed by a cycle period synchronized with the second periodic signal to transmit it to the primary system and the backup system. A receiving method of the present invention is a receiving method for receiving a data string signal multiplexed by a predetermined cycle period from a primary system and a backup system in which: synchronous processing of reception signals received from a primary system and a backup system is performed; processing for aligning phases of reception signals which are received from the primary system and the backup system and on which the synchronous processing has been performed with the phase of the predetermined cycle period is performed; and switching between a reception signal which is received from the primary system and on which said phase alignment processing has been performed and a reception signal which is received from the backup system and on which phase aligning processing have been performed is performed.12-23-2010
20100322353NONLINEAR POST-PROCESSORS FOR CHANNELS WITH SIGNAL-DEPENDENT NOISE - A non-linear post-processor for estimating at least one source of signal-dependent noise is disclosed. The post processor may receive a set of preliminary decisions from a sub-optimal detector along with the sampled data signal. The post-processor may then compute the transition jitter and white noise associated with each preliminary decision in the set and assign a cost metric to each decision based on the total signal noise. The post-processor may output the decision with the lowest cost metric as the final decision of the detector.12-23-2010
20100104049DUAL-RATE SINGLE BAND COMMUNICATION SYSTEM - A system, method, and apparatus for a multiple data rate communication system is presented herein. The communication system receives data samples that are either sampled at a narrowband rate or a wideband rate and provides various functions and services, such as echo cancellation, DTMF detection and generation, and call discrimination. For wideband signals, a down-sampled signal is provided for each of the foregoing function and service. The output of the function or services is then recombined with the wideband signal.04-29-2010
20100104046RECEIVER OF BINARY OFFSET CARRIER (BOC) MODULATED SIGNALS - Binary Offset Carrier (BOC) is the agreed modulation for signals of next generation Global Navigation satellite systems (GNSS). Compared to current phase shift keying (PSK) modulation by a code, there is a further modulation by a sub-carrier. There is a known major difficulty with BOC called ‘false lock’ where early/late gates settle on the wrong peak of the multi-peaked correlation function. This invention eliminates the problem by eliminating that correlation. Instead, a two dimensional correlation is tracked independently to realise a dual estimate. An unambiguous lower accuracy estimate derived from the code phase is used to make an integer correction to a higher accuracy but ambiguous independent estimate based on the sub-carrier phase. The actual receiver may adopt a triple loop, instead of the usual double loop, where carrier phase, sub-carrier phase and code phase are tracked independently but interactively.04-29-2010
20100104048TIME DELAY MEASUREMENT - A method of processing first and second corresponding signals having a delay therebetween, at least the first signal being a binary signal having chip boundaries, comprises: introducing a plurality of different delays between the first and second signals, successive delay amounts differing from each other by less than the interval between chip boundaries, and for each introduced delay, summing samples of the second signal which are obtained at the times of, at least, chip boundaries between bits of the first signal which have the same state, to obtain a value; thereby to obtain a representation of how the value varies according to the introduced delay, which representation contains a level change associated with an introduced delay which bears a predetermined relationship to the delay between the first and second signals.04-29-2010
20100104047MULTIPLE-ANTENNA SPACE MULTIPLEXING SYSTEM USING ENHANCEMENT SIGNAL DETECTION - The multiple-antenna space multiplexing system using enhancement signal detection comprising: a code modulation module for coding and modulating bit information; a signal transmission module for transmitting the modulated signals; a signal reception module for receiving the signals; a signal form transform module for transforming form of a channel matrix H and the received signal vector r; a signal detection module for detecting the received signals; a signal reconstruction module for reconstructing the detection results of in the signal detection module, and obtaining a detected signal; a demodulation decoding module for demodulating and decoding the output of the signal reconstruction module, and outputting bit information. Compared with the conventional detection methods, the system performance is improved in considering the realization complexity.04-29-2010
20090310717SIGNAL CONVERTERS - A signal converter. The signal converter converts an analog inphase signal and an analog quasdrature phase signal into a digital baseband inphase signal and a digital baseband quadrature phase signal. The analog inphase signal and the analog quadrature phase signal are orthogonal to each other and are carried in a predetermined intermediate frequency. The digital baseband inphase signal and the digital baseband quadrature phase signal are carried in zero frequency. The signal converter comprises a signal combiner combining the analog inphase signal and the analog quadrature phase signal to obtain an analog combined signal, an analog to digital converter converting the analog combined signal to a digital combined signal, and a signal separator separating the digital combined signal to obtain the digital baseband inphase signal and the digital baseband quadrature phase signal.12-17-2009
20090135962Digital slicing device - A digital slicing device is provided for making a numerical value determination with respect to an inputted modulated symbol so as to output a corresponding symbol. The digital slicing device includes a demodulating unit, a slicing unit and a re-modulating unit. The demodulating unit is for collecting at least two successive modulated symbols and for demodulating the two modulated symbols according to a modulation algorithm so as to generate two demodulated symbols. The slicing unit is for rounding the two demodulated symbols so as to generate two rounded demodulated symbols. The re-modulating unit is for re-modulating the two rounded demodulated symbols according to the modulation algorithm so as to generate two re-modulated symbols corresponding to the two modulated symbols. The two modulated symbols are generated simultaneously through conversion using the modulation algorithm.05-28-2009
20120183104DIGITAL PHASE FREQUENCY DETECTOR, DIGITAL PHASE LOCKED LOOP INCLUDING THE SAME AND METHOD OF DETECTING PHASE AND FREQUENCY OF OUTPUT SIGNAL - A digital phase frequency detector includes a detection unit, a reset unit and a phase comparison unit. The detection unit detects edges of a reference signal and a feedback input signal to generate a reference edge signal and a feedback edge signal. The reset unit generates a reset signal resetting the detection unit based upon the reference edge signal and the feedback edge signal. The phase comparison unit generates first and second phase comparison signals based upon the reference edge signal and the feedback edge signal. The phase comparison unit includes a first flip-flop generating a first comparison signal based upon the reference edge signal and the feedback edge signal, a second flip-flop generating a second comparison signal based upon the reference edge signal and the feedback edge signal, and a latch block latching the first and second comparison signals to generate the first and second phase comparison signals.07-19-2012
20120183103Demodulation Method and Demodulator for Orthogonal Frequency Division Multiplexing - Multiple Input Multiple Output System - A demodulation method and a demodulator for an (OFDM MIMO) system are provided, and by using a received reference signal, the channel estimation value at the reference signal sub-carrier in each channel is obtained by estimation; by using the channel estimation value, an equalization matrix at the reference signal sub-carrier is obtained; by using the obtained equalization matrix to carry out the interpolation calculation, equalization matrixes are obtained; by using the data signals in various paths and corresponding equalization matrixes, an intermediate estimation value is obtained by calculation; by using a precoding matrix to carry out de-precoding on the intermediate estimation value, a final estimation value is obtained. The demodulator comprises an OFDM demodulation module, a frame parsing module, a precoding matrix generation module, a partial channel estimation module, a partial equalization matrix generation module, an equalization matrix interpolation module, a MIMO demodulation module and a de-precoding module.07-19-2012
20120183102Receiver Circuits and Systems for Receiving Medium Wave and Short Wave Signals - A receiver includes a first terminal for receiving an RF signal having a frequency of less than approximately 60 MHz, a second terminal, and a receive path having an input coupled to the first terminal and an output for providing a demodulated RF signal. The receiver further includes a detector coupled to the receive path for detecting a signal parameter in the RF signal and a controller coupled to the detector and to the second terminal. The controller provides the multiplex signal in a tuning state to the second terminal to selectively provide one of a first RF signal and a second RF signal to the first terminal and to determine at least one of a first parameter of the first RF signal and a second parameter of the second RF signal. The controller provides the multiplex signal in an operating state based on the first parameter and the second parameter.07-19-2012
20130083870RECEIVING DEVICE AND RECEIVING METHOD - A synthesizing unit of a receiving device according to an embodiment synthesizes fixed components, which are fixed between carriers of an effective symbol, included in inter-carrier interference (ICI) in a broadcast signal on which fast Fourier transform (FFT) has been performed in view of an adding position of the guard interval in the broadcast signal and ICI in a broadcast signal on which FFT has been performed without considering the adding position, according to an addition amount of the guard interval. The ICI calculating unit calculates ICI to be removed from the broadcast signal based on the fixed component synthesized by the synthesizing unit.04-04-2013
20100067620REDUCED COMPLEXITY SLIDING WINDOW BASED EQUALIZER - A method and apparatus for use in data estimation in wireless communication are provided. A wireless communications signal is received and transformed to produce a received vector. The received vector is processed using a sliding window based approach that includes processing each of a plurality of windows. For each window, an approximate circulant channel response matrix is produced for use in estimating a data vector corresponding to the window.03-18-2010
20100329394APPARATUS AND METHOD FOR ESTIMATING I/Q UNBALANCE PARAMETERS IN OFDM RECEIVER - Provided are an apparatus and a method for estimating I/Q unbalance parameters in an OFDM receiver. The apparatus includes an unbalance parameter estimator and an I/Q unbalance compensator. The unbalance parameter estimator estimates an amplitude difference and a phase difference depending on positions of pilot tones in a preamble of a received signal. The I/Q unbalance compensator compensates for an I/Q unbalance using the amplitude difference and the phase difference estimated by the unbalance parameter estimator.12-30-2010
20130089168RADIO TRANSMISSION DEVICE AND RADIO TRANSMISSION METHOD - It is possible to improve the CQI reception performance even when a delay is caused in a propagation path, a transmission timing error is caused, or a residual interference is generated between cyclic shift amounts of different ZC sequences. For the second symbol and the sixth symbol of the ACK/NACK signal which are multiplexed by RS of CQI, (+, +) or (−, −) is applied to a partial sequence of the Walsh sequence. For RS of CQI transmitted from a mobile station, + is added as an RS phase of the second symbol and − is added as an RS phase of the sixth symbol. A base station (04-11-2013
20130051498INSTANTANEOUS PHASOR DETERMINATION FOR POLY-PHASE ELECTRICAL GRIDS - In one embodiment, three substantially simultaneous phase waveforms may be converted into a first quadrature signal and a zero sequence signal. For each phase waveform, a power system digital frequency may be determined through analysis of the first quadrature signal (e.g., and at least one additional prior quadrature signal) while eliminating waveform phase angles from the analysis. Subsequently, demodulation of the first quadrature signal and zero sequence signal based on the power system digital frequency results in a positive sequence phasor, a negative sequence phasor, and a zero sequence phasor.02-28-2013
20130051497Method and Apparatus for Implementing Slice-Level Adjustment - In one embodiment, a receiver may receive a signal from a transmitter. The receiver may include a first sampler that may sample the signal when the value of the signal is zero. The receiver may further include a second sampler that may sample the signal halfway between a time when the first sampler samples the signal and the next time when the first sampler samples the signal to produce a set of sampled values. The receiver may be further operable to determine that a sampled value in the set of sampled values is a logic 1 if the sampled value is greater than the value of a reference voltage and that the sampled value is a logic 0 if the sampled value is less than the value of the reference voltage.02-28-2013
20090323866Demodulation method - A method of calculating at least one soft bit corresponding to a data symbol received by a radio receiver is described. In one form the method (12-31-2009
20100266070SEMICONDUCTOR DEVICE - A semiconductor device is provided, which comprises a first demodulation circuit, a second demodulation circuit, a first bias circuit, a second bias circuit, a comparator, an analog buffer circuit, and a pulse detection circuit. An input portion of the pulse detection circuit is electrically connected to an output portion of the analog buffer circuit, a first output portion of the pulse detection circuit is electrically connected to an input portion of the first bias circuit, and a second output portion of the pulse detection circuit is electrically connected to an input portion of the second bias circuit.10-21-2010
20090304120WIRELESS COMMUNICATION SYSTEM WITH IMPROVED BROADCAST COVERAGE - Techniques to transmit data with cyclic delay diversity and pilot staggering are described. For cyclic delay diversity, OFDM symbols having different cyclic delay durations are generated. The cyclic delay durations for the OFDM symbols may be selected to be time varying with respect to the cyclic delay durations for OFDM symbols transmitted by a neighboring base station. An FDM pilot is generated and multiplexed on multiple sets of subbands in different symbol periods. Waveforms for a second radio technology (e.g., W-CDMA) may be generated for data to be transmitted with this radio technology. The OFDM symbols are multiplexed onto time slots used for OFDM, and the waveforms for the second radio technology are multiplexed onto time slots used for this radio technology. One or multiple modulated signals may be generated based on the multiplexed OFDM symbols and waveforms. Each modulated signal is transmitted from a respective antenna.12-10-2009
20090304119RECEIVING APPARATUS, RECEIVING METHOD AND WIRELESS COMMUNICATION SYSTEM - There is provided a receiving apparatus including a plurality of antennas, a power detection unit to detect received power of respective received signals received by the plurality of antennas, and a plurality of reception processing units that includes a first reception processing unit to perform reception processing with a first bit width on a received signal received by any one of the plurality of antennas and a second reception processing unit to perform reception processing with a second bit width smaller than the first bit width on a received signal detected by the power detection unit as having lower received power than the received signal to be processed by the first reception processing unit.12-10-2009
20090304118DIVERSITY RECEIVING DEVICE - A diversity receiving device includes a plurality of mixers which are provided to correspond to antennas arranged so as to be separated from each other and each of which multiplies a radio frequency signal output from the corresponding antenna by a local oscillation signal to modulate the radio frequency signal into an intermediate frequency signal; a reference signal source that generates a reference signal; a plurality of local oscillating units which are provided to correspond to the plurality of mixers, and each of which generates a local oscillation signal having a frequency corresponding to the phase of the reference signal and supplies the local oscillation signal to the corresponding mixer; a filter circuit that is provided between the reference signal source and the plurality of local oscillating units and changes the phase of the reference signal supplied to all the local oscillating units or the local oscillating units other than one local oscillating unit according to a predetermined passband frequency; an adder that combines the intermediate frequency signals output from the mixers; and a phase control circuit that detects a phase difference between the intermediate frequency signals output from the plurality of mixers and controls the passband frequency of the filter circuit such that there is no phase difference between the intermediate frequency signals.12-10-2009
20090304117CONCATENATED CODING/DECODING IN COMMUNICATION SYSTEMS - A method and apparatus for improving performance in communication systems is provided. In one implementation received encoded data is decoded using an inner rateless decoder to produce a series of decoded rateless outputs. The series of decoded rateless outputs is combined to produce a block, and the block is decoded using an outer block decoder. In another implementation, encoded data for a data block encoded with a rateless code is received. It is determined that an initial predetermined amount of mutual information for the data block has been received, the initial predetermined amount being an amount expected to allow decoding of the received encoded data. Additional encoded data for the data block is received. It is determined that an extra predetermined amount of mutual information for the data block has been received beyond said initial predetermined amount of mutual information.12-10-2009
20090304116HARDWARE ENGINE TO DEMOD SIMO, MIMO, AND SDMA SIGNALS - An apparatus including a configurable demodulation architecture which includes a control module and a demodulation engine. The control module includes a set of one or more control fields. The demodulation engine includes a spatial whitening module, a Minimum Mean Square Estimation (MMSE) module, at least a first Maximal Ratio Combining (MRC) module, and at least one multiplexer. Further, the multiplexer is coupled to the instruction module and controlled based on the control fields to select at least one of the MMSE module or MRC module.12-10-2009
20090304114METHOD FOR DECODING DIGITAL INFORMATION ENCODED WITH A CHANNEL CODE - The performance of multiple-input multiple-output (MIMO) systems, employing coding with multiple antennas depends heavily on the demapper algorithm which is used for MIMO detection. Soft-output demappers lead to better bit error rate (BER) performance compared to hard-decision demappers, but have a higher implementation complexity. The algorithm, proposed in this paper, relies on low-complexity harddecision MIMO detection. The reliability information for the received bits used to compute log-likelihood ratios is based on an estimate of the average bit error rate which is for example derived from the corresponding channel state information only. The algorithm is applicable to any hard-decision MIMO detector. As an example, we describe the application of the scheme to a linear MMSE detector and to sphere decoding with early termination.12-10-2009
20120219095Blind Control Channel Detection - The present invention proposes a method, including receiving a sequence of channelization encoded correlated symbols x08-30-2012
20090092205TABLE DATA GENERATION DEVICE AND METHOD - A table data generation device includes: a setting data storage section that stores setting data of a receiver for receiving broadcast waves; a bit width specification section that specifies a bit width from a reference position of the setting data; a number-of-shifts specification section that specifies a number of shifts of the setting data; and a table data generator that generates table data for the setting data by shifting the specified bit width of the setting data by the specified number of shifts.04-09-2009
20130070877SYSTEMS AND METHODS FOR PROVIDING PRODUCT INFORMATION OVER A CARRIER WAVE - A method is provided that comprises tuning a radio system to a frequency band that contains a locally-broadcast terrestrial radio signal. The locally-broadcast terrestrial radio signal comprising a main signal component and a side data component is thereby received. In response to receiving the locally-broadcast terrestrial radio signal a determination is made as to a permissible time for processing the side data component using a time slot schedule. The side data component is processed at the permissible time. A message corresponding to the side data component is outputted to an output device. In some instances, the side data component includes the message. In other instances, the method further includes searching a message lookup list using a code included in the side data component. When a stored code is found that matches the code, the message corresponding to the matching stored code is outputted.03-21-2013
20130070876Multiple-Input Multiple-Output Low-Noise Block Downconverter and Low-Noise Module - A low-noise block downconverter (LNB) is disclosed. The low-noise block downconverter comprises a first input module, for outputting a first intermediate frequency (IF) signal after receiving a first polarization signal via a first input end; a second input module, for outputting a second IF signal after receiving a second polarization signal via a second input end; a first output module, coupled to the first input module, for amplifying the first IF signal, to output a first user signal to a first user; and a second output module, coupled to the second input module, for amplifying the second IF signal, to output a second user signal to a second user.03-21-2013
20130070875LOW POWER RADIO FREQUENCY TO DIGITAL RECEIVER - A radio frequency to digital receiver has a modulator sampling a signal at a first rate. The receiver has at least one processing unit. The processing unit has a plurality of digital bandpass filters separating the signal and recombining the signal at a rate less than the first rate. The processing unit has a digital down converter adjusting frequency offset or centering the signal at the rate less than the first rate. The receiver has at least one rate control buffer coupled to adjacent processing units when two or more processing units are within the receiver.03-21-2013
20110058632METHOD AND DEVICE FOR SOFT-OUTPUT DETECTION IN MULTIPLE ANTENNA COMMUNICATION SYSTEMS - An embodiment of a method and device for detecting a signal and generating bit soft-output of a multiple-input multiple-output system is provided. The device includes at least one channel estimates pre-processing unit, one received vector processing and one detection and soft-output generation unit. The pre-processing unit calculates multiple QR Decompositions of the input channel estimation matrix. The detection and soft-output generation unit computes near optimal bit soft output information with a deterministic complexity and latency. It may implement a reduced complexity search method. Globally, embodiments of the invention may allow achieving low complexity, high data rate, scalability in terms of the dimension of the MIMO system and flexibility versus the supported modulation order, all potentially key factors for most MIMO wireless transmission applications.03-10-2011
20110058631Systems and Methods for Enhanced Flaw Scan in a Data Processing Device - Various embodiments of the present invention provide systems and methods for flaw scan in a data processing system. As one example, a data processing system is disclosed that includes a data detector circuit, a bit sign inverting circuit, and an LDPC decoder circuit. The data detector circuit receives a verification data set that is an invalid LDPC codeword, and applies a data detection algorithm to the verification data set to yield a detected output. The bit sign inverting circuit modifies the sign of one or more elements of a first derivative of the detected output to yield a second derivative of the detected output. The second derivative of the detected output is an expected valid LDPC codeword. The LDPC decoder circuit applies a decoding algorithm to the second derivative of the detected output to yield a decoded output.03-10-2011
20130058439Receiver - The present invention discloses a receiver for a communication system. The receiver includes at least one power detector, for detecting the power value of the processed signal of a received signal; a dynamic analog to digital converter (ADC), having a variable set point and a variable dynamic range; and a Digital Signal Processor (DSP), for adjusting the variable set point and the variable dynamic range according to the power value.03-07-2013
20130058440METHOD TO REDUCE PEAK TO AVERAGE POWER RATIO IN MULTI-CARRIER MODULATION RECEIVERS - A method for performing channel estimation in an orthogonal frequency division multiplexing (OFDM) signal includes choosing reserved tones to be part of a pilot pattern, and using the reserved tones in the pilot pattern to perform the channel estimation. An apparatus for use in performing channel estimation in an OFDM system includes a receiver configured to receive a transmitted OFDM signal; a pilot symbol extractor configured to extract pilot symbols from the OFDM signal; and a channel estimator configured to perform the channel estimation, including using reserved tones as pilot tones.03-07-2013
20110013730Optimized Physical Broadcast Channel Reception - A receiver receives information from a physical broadcast channel signal, wherein the receiver includes a blind processing and decoding unit that utilizes a hypothesis about how many transmit antennas were used to transmit the signal. Received signal characteristics are detected that indicate how many transmit antennas were used. Each transmit antenna hypothesis in a stored list represents how many transmit antennas were used. For each of the stored hypotheses, a probability value is determined based, at least in part, on the detected signal characteristics. The list of hypotheses is modified to associate the probability values with respective ones of the transmit antenna hypotheses. The modified list is used to provide antenna hypothesis probabilities, and the blind processing and decoding unit is operated such it begins with a most probable antenna hypothesis and continues with increasingly less probable antenna hypotheses until successful decoding occurs or all antenna hypotheses have been made.01-20-2011
20090285336Wideband Out-Of-Band-Receiver - The disclosed embodiments relate to a system that processes a received signal. An exemplary embodiment of the system comprises a receiver circuit that is adapted to receive the received signal and separate an out-of-band data signal corresponding to an out-of-band frequency spectrum from the received signal, an analog-to-digital (A/D) converter that converts the out-of-band data signal to a digitized out-of-band frequency spectrum signal, and a circuit that is adapted to identify data corresponding to an out-of-band data channel within the digitized out-of-band frequency spectrum signal.11-19-2009
20090268853MULTIPLE INPUT, MULTIPLE OUTPUT CHANNEL, DIGITAL RECEIVER TUNER - The present invention teaches a compact and highly integrated multiple-channel digital tuner and receiver architecture, suitable for widespread field deployment, wherein each receiver demodulator channel may be remotely, automatically, dynamically, and economically configured for a particular cable, carrier frequency, and signaling baud-rate, from an option universe that includes a plurality of input cables, a plurality of carrier frequencies, and a plurality of available baud-rates. A multiple coax input, multiple channel output, digital tuner is partitioned into a multiple coax input digitizer portion and a multiple channel output front-end portion. The digitizer portion consists of N digitizers and accepts input signals from N coax cables and digitizes them with respective A/D converters. The front-end portion consists of M front-ends and provides M channel outputs suitable for subsequent processing by M respective digital demodulators. In a first clock domain, a fixed predetermined A/D sampling rate is chosen to provide oversampling of the inputs by a common integer multiple of all the symbol rates of interest. A plurality other clock domains operate at selectable sub-multiples of the first domain as required to deliver a constant number of symbol samples at the output of each front-end. At the input to each of the M front-ends is a respective input selector coupled to each of the N streams of digitized input data followed by a digital signal scaler that dynamically scales the selected incoming stream of digitized input data as a function of the signal power of the channel's associated carrier.10-29-2009
20090268852OFDM DEMODULATION DEVICE - An OFDM (Orthogonal Frequency Division Multiplexing) demodulator includes: an FFT (Fast Fourier Transform) circuit (10-29-2009
20090268851Method for Detecting Paths in Pulse Transmission and a Device for Carrying Out Said Method - The invention relates to method and device for detecting propagation paths in pulse transmission, wherein a received signal comprises pulses on each time symbol. After synchronising a pulse-based reception, the inventive method consists (A) in determining the arrival times of pulses of the same current time symbol, (B) in generating a path hypotheses by assigning an initial score to each dated pulse, (C) in determining the arrival times of pulses of the time symbol following the current symbol, (D) in relatively comparing the arrival times of pulses of the following time symbol with the arrival times of the path hypotheses and (E) in updating scores according to the relative comparison results. Said path detecting method is suitable for pulse information transmission, in particular in UWB.10-29-2009
20090067551GENERATING AND COMMUNICATING SOURCE IDENTIFICATION INFORMATION TO ENABLE RELIABLE COMMUNICATIONS - A method of generating Source Identification information from a source packet stream and reliably transmitting the Source Identification information from a source to a destination over a communications channel is provided. The method operates on a set of source packets, wherein Source Identification information for each source packet to be transmitted is derived and delivered with the Source Identification information of all or most other source packets of an associated source block. The method includes techniques to minimize the network bandwidth required to deliver Source Identification information and techniques to overcome network impairments. When combined with FEC techniques, retransmission techniques, or combinations of FEC techniques and retransmission techniques, the methods described herein allow receivers to recover lost source packets, while simultaneously ensuring that the original source packets are not modified and thereby ensuring backwards compatibility for legacy receivers.03-12-2009
20100091911WIRELESS COMMUNICATION APPARATUS, WIRELESS COMMUNICATION METHOD, AND COMPUTER PROGRAM - A wireless communication apparatus is provided for receiving packets transmitted with delay amounts different for the respective transmission branches. The wireless communication apparatus includes a plurality of reception branches, a synchronous processing unit for detecting synchronous timing independently for the respective reception branches; and a signal processing unit for performing decoding processing and other kinds of processing subsequent to the synchronous timing for the respective reception branches.04-15-2010
20100091910Reception Device and Reception Method - Provided is a reception device which can reduce a parallel interference canceller processing delay. The reception device (04-15-2010
20130064327RECEIVER HAVING CONTROLLER TO SET LOCAL OSCILLATORS SO AS TO RENDER INTERFERING SIGNALS FILTERABLE AND ASSOCIATED METHODS - A receiver includes a first local oscillator (LO), with a pair of in-phase and quadrature (IQ) mixers coupled to the first LO and configured to generate complex IQ signals having an IQ imbalance. The receiver also includes a second LO, with a complex mixer coupled to the second LO and configured to mix the complex IQ signals and generate intermediate frequency (IF) signals based thereon. A controller is coupled between the pair of IQ mixers and the complex mixer and configured to set the first LO and the second LO so that the complex IQ signals and an interfering signal generated due to the IQ imbalance of the complex IQ signals have a same sign and non-overlapping bands at an input of the complex mixer.03-14-2013
20130064330SEMICONDUCTOR DEVICE AND COMMUNICATION DEVICE - There is a need for reducing the scale of a circuit that determines and decodes code types for reception signals coded with different codes. A reception logic circuit determines and decodes code types for reception signals coded with different codes. The reception logic circuit determines one of code types for a demodulation signal corresponding to the reception signal based on a difference between codes detected during a modulation period or a non-modulation period occurring in the demodulation signal. The reception logic circuit decodes the code type in accordance with the determined code type based on the modulation period or the non-modulation period that alternately occurs in the demodulation signal. In this manner, the received data is reproduced. There is no need for a decoder specific to each code.03-14-2013
20130064329PHASE SLIP REDUCTION METHOD - Disclosed herein are methods and techniques for reducing phase slips in optical communications systems and in particular methods and techniques that operate in receivers for a coherent communication system transmitting modulated data symbols exhibiting N-ary symmetrical constellation and predetermined reference symbols.03-14-2013
20130064328RADIO FREQUENCY RECEIVER SYSTEM FOR WIDEBAND SIGNAL PROCESSING - Wireless communication is ubiquitous today and deployments are growing rapidly leading to increased interference, increasing conflicts, etc. As a result monitoring the wireless environment is increasingly important for regulators, service providers, Government agencies, enterprises etc. Such monitoring should be flexible in terms of the networks being monitored within the wireless environment but should also provide real-time monitoring to detect unauthorized transmitters, provide dynamic network management, etc. Accordingly, based upon embodiments of the invention, a broadband, real-time signal analyzer (RTSA) circuit that allows for the deployment of RTSA devices in a distributed environment wherein determination of policy breaches, network performance, regulatory compliance, etc. are locally determined and exploited directly in network management or communicated to the central server and network administrators for subsequent action. Beneficially the RTSA exploits a broadband RF front end in conjunction with parallel direct down conversion and FFT techniques.03-14-2013
20120195398Virtual limited buffer modification for rate matching - Virtual limited buffer modification for rate matching. A reduced-size memory module is employed within a communication device to assist in storage of log-likelihood ratios (LLRs) employed in accordance with turbo decoding. This architecture is also applicable to other types of error correction code (ECC) besides turbo code as well. The memory size is selected to match the number of coded bits (e.g., including information bits and redundancy/parity bits) that is included within a transmission. The received signals may be various transmissions made in accordance with hybrid automatic repeat request (HARQ) transmissions. When the LLRs calculated from a first HARQ transmission is insufficient to decode, those LLRs are selectively stored in the memory module. When LLRs corresponding to a second HARQ transmission is received, LLRs corresponding to both the first HARQ transmission and the second HARQ transmission are passed from the memory module for joint use in decoding.08-02-2012
20130188757ROBUST CHANNEL ESTIMATION AND INTERPOLATION - Present robust 2D-MMSE or minimax approach assumes significant time and frequency selectivity due to which it has a poor MSE performance for RBs with low/moderate frequency and/or time selectivity. Further, a filter cannot be designed assuming low frequency and/or time selectivity and use that for all channel models. The instant invention proposes Robust Adaptive (RA) MMSE filter that can bridge the gap between a robust 2D-MMSE/minimax and the optimal MMSE approach. Further, the RA-MMSE filter smoothens the filter coefficients of the robust 2D-MMSE filter with the degree of smoothing adaptively changing with amount of frequency and time selectivity within a RB. Further, the method uses multiple hypothesis tests on the maximum likelihood CFR estimates at the pilots. Further the RA-MMSE filter solves the minimax estimation problem with additional constraints on the autocorrelation sequence corresponding to the channel frequency response.07-25-2013
20090238310WEIGHT GENERATION METHOD FOR MULTI-ANTENNA COMMUNICATION SYSTEMS UTILIZING RF-BASED AND BASEBAND SIGNAL WEIGHTING AND COMBINING BASED UPON MINIMUM BIT ERROR RATE - A method for processing communication signals is disclosed and may include, in a receiver and/or a baseband processor coupled to the receiver, the receiver comprising a plurality of antennas, generating a plurality of RF weighting values based on one or more output bit error rates of the receiver. A plurality of spatially-multiplexed RF signals, which are received by the receiver, may be weighted with the one or more of the generated plurality of RF weighting values, to form a plurality of weighted RF signals. Two or more of the generated plurality of weighted RF signals may be combined to form one or more combined RF signals. Each of the one or more combined RF signals may be processed by a different RF processing chain. The one or more output bit error rates of the receiver may be minimized by the generation of the plurality of RF weighting values.09-24-2009
20090238309Data exchange between channels in a data acquisition system - An apparatus and method for inter-channel data exchange in multi-channel data acquisition systems is disclosed. A multi-channel data acquisition system may include a data exchange layer coupling two or more channels of the data acquisition system. Data may be transmitted via the data exchange layer between the channels, enabling data from one channel to be processed and output by another channel. The data exchange layer may include serial or parallel communication means.09-24-2009
20090046817RECEIVING APPARATUS AND METHOD - A receiving apparatus includes a unit detecting a specific-bit sequence included in a data sequence, a unit counting, as a count value n02-19-2009
20090046816DIGITAL BROADCASTING SYSTEM AND METHOD OF PROCESSING DATA - A digital broadcast system and a method of processing data are disclosed. The receiving system of the digital broadcast system includes a signal receiving unit, a first data processor, a second data processor, and an A/V decoder. The signal receiving unit receives at least one of first mobile service data that is transmitted according to a first transmission method and second mobile service data that is transmitted according to a second transmission method. The first data processor performs demodulation on the first mobile service data received by the signal receiving unit using a first demodulation method and corrects errors occurring in the demodulated first mobile service data. The second data processor performs demodulation on the second mobile service data received by the signal receiving unit using a second demodulation method and corrects errors occurring in the demodulated second mobile service data. The A/V decoder performs A/V decoding on mobile service data outputted from at least one of the first and second data processors.02-19-2009
20090316838Cordic based complex tuner with exact frequency resolution - Systems and methods are disclosed that include selecting a sampling frequency and a tuning resolution frequency. These systems and methods may further include determining a wordlength of the phase accumulator, a numeric representation of the phase range, and a reduced representable value of a phase accumulator. In addition, these systems and methods may include operating the phase accumulator, where the phase accumulator creates an output phase accumulator signal. These systems and methods may further includes adjusting the angle of the output phase accumulator signal, where the output phase accumulator signal is adjusted based upon the operation of the phase accumulator, where adjusting the angle of the output phase accumulator signal creates an adjusted output phase accumulator signal and operating a CORDIC module, and where the CORDIC module performs operations upon the output phase accumulator signal based upon the parameters of the phase accumulator.12-24-2009
20090010364Parameter estimation for adaptive antenna system - There is proposed a technique for determining parameters, especially channel estimation, in the receiver of a communication system utilizing adaptive antenna techniques. The technique uses information transmitted in the antenna signals and in the beam signals to determine the parameters.01-08-2009
20090010363Matched filter - Provided is a matched filter whose circuit scale can be made significantly smaller by reducing the number of multipliers for a despreading process and the number of adders for an accumulating process. For each in-phase/orthogonal component, the matched filter includes a dual-port RAM that separates written samples into 128 groups each of 32 samples which are collectively read out group by group in order at a speed faster than a write speed in write mode, a bit separating section that separates data read group by group into 32 samples and simultaneously outputs the 32 samples, and 32 despreading/accumulating circuits that, with 16 samples sequentially input from 16 groups being taken as one block, sequentially despread individual samples, accumulate despreading results, and output accumulated values for each block. The matched filter further includes an accumulating section that accumulates absolute values for each block from in-phase/orthogonal outputs of the despreading/accumulating circuits, and outputs correlation value data.01-08-2009
20090010362Coding And Decoding Packetized Data - A method for coding a packet of information words into frames for transmission, includes receiving blocks of input data, including control words and the packet of information words. When the block consists exclusively of information words, a master transition having a first sense is scrambled and appended to the block to form one of the frames. When the block does not consist exclusively of information words: the block is condensed to accommodate a TYPE word; a TYPE word having a value that indicates a structural property of the block is generated and inserted into the block; and a master transition having a second sense, opposite to the first sense, is scrambled and appended to the block to form one of the frames.01-08-2009
20130163700Process for Suppressing Intercarrier Interference in a OFDM Receiver - Process for canceling Intercarrier Interference in a OFDM receiver receiving OFDM blocks in presence of Doppler, comprising the steps of: receiving a OFDM block comprising N samples; applying a FFT for the purpose of generating N frequency domain representations composing the received signal (R); multiplying said received signal (R) by the hermitian value of the channel (H06-27-2013
20130163701High-Speed Serial Data Transceiver and Related Methods - A high-speed serial data transceiver includes multiple receivers and transmitters for receiving and transmitting multiple analog, serial data signals at multi-gigabit-per-second data rates. Each receiver includes a timing recovery system for tracking a phase and a frequency of the serial data signal associated with the receiver. The timing recovery system includes a phase interpolator responsive to phase control signals and a set of reference signals having different predetermined phases. The phase interpolator derives a sampling signal, having an interpolated phase, to sample the serial data signal. The timing recovery system in each receiver independently phase-aligns and frequency synchronizes the sampling signal to the serial data signal associated with the receiver. A receiver can include multiple paths for sampling a received, serial data signal in accordance with multiple time-staggered sampling signals, each having an interpolated phase.06-27-2013
20130163702RECEIVING APPARATUS THAT RECEIVES PACKET SIGNAL IN WHICH A KNOWN SIGNAL IS PLACED IN THE BEGINNING OF PACKET SIGNAL - A detector receives detects a first known signal in a packet signal. An LTF correlation unit performs correlation processing on the packet signal received by a receiving unit. Upon detecting the arrival timing, an update correlation unit terminates a first window and performs correlation processing on the packet signal received by the receiving unit, in a second window. When correction timing is detected and when correction timing is more likely to be accurate than the arrival timing, an estimation unit changes the correction timing to the arrival timing; when the arrival timing is more likely to be accurate than the correction timing, the estimation unit maintains the arrival timing.06-27-2013
20120269301MIMO DETECTOR - A MIMO detector for use in MIMO-OFDM wireless communication that forms a plurality of propagation paths by using a plurality of transmitting and receiving antennas includes: an inverse matrix calculator operating as an inverse matrix calculation unit configured to calculate an inverse matrix of a matrix of the propagation path based on a signal received by a receiver; a detection speed controller operating as an estimation unit configured to estimate a variation in the propagation path over time; and a phase synchronization circuit and a regulator configured to variably control a processing time required to calculate the inverse matrix by the inverse matrix calculator, according to the variation in the propagation path over time estimated by the detection speed controller. The MIMO detector is provided on the side of the receiver of the wireless communication.10-25-2012
20120269299 Precoded Data Receiver - Methods and apparatus are disclosed for applying successive multi-rank beamforming strategies (e.g., successive precoding strategies) for the design of precoders over a set of parallel channels. Successive beamforming is applied to a narrow band channel model and is also applied for finer quantization of a single beamforming vector (e.g., recursive beamforming). A first embodiment provides the optimal approach with high complexity. An alternative embodiment provides successive beamforming for near optimal precoding selection with medium complexity. A low complexity method for precoder selection is also provided wherein a channel representative matrix for the set of parallel channels is determined and successive beamforming on the calculated channel representative is applied.10-25-2012
20080292026DIGITAL SIGNAL RECEIVER WITH Q-MONITOR - A digital signal receiver for a high-bitrate digital signal has a serial signal input (11-27-2008
20100226461COMMUNICATION DEVICE, COMMUNICATION METHOD, AND PROGRAM - A communication device includes: demodulating means for demodulating a transmission signal from another communication device that performs noncontact communication; calculating means for performing at least one of addition and subtraction of a predetermined voltage according to a logical value of a demodulated signal obtained by demodulation by the demodulating means; determining means for determining a communication system of the transmission signal transmitted by the other communication device by comparing a calculation result of the calculating means at predetermined timing after a lapse of a predetermined time from the start of communication with a threshold voltage; and transmitting means for transmitting predetermined data to the other communication device in the communication system determined by the determining means among plural communication systems that the device itself can support.09-09-2010
20100266069ITERATIVE RECEIVER AND ITERATIVE DECODER - An iterative receiver and an iterative decoder are provided. The iterative receiver includes: an external decoder to decode the detected received signal; an impurity adder to add an impurity to an output signal of the external decoder; an interleaver to perform interleaving between the internal detector and the external decoder; and a de-interleaver to perform de-interleaving between the internal detector and the external decoder.10-21-2010
20100040176Channel Impulse Response Estimate Management - A method of steering a channel estimation search window, the method comprising providing a series of raw CIR tap values to span a channel estimation search window containing a sub-window whose contents are intended to be passed for further processing to produce a refined CIR estimate, determining, amongst a plurality of groups of continuous tap values within the window, the group containing the largest amount of signal energy and time-shifting the window as necessary to arrange that the group so determined occupies the sub-window.02-18-2010
20110182385METHOD AND APPARATUS FOR RELIABILITY-AIDED PRUNING OF BLIND DECODING RESULTS - Reliability metric(s), based on output of a decoder module, associated with each possible hypothesis associated with blind decoding are provided that aids a pruning process by rejecting unreliable CRC-passed hypotheses. In an aspect, a downlink control channel carries scheduling assignments and other control information. As location, size, and CRC masking associated with downlink control information are not known to a receiver, blind decoding over possible hypotheses may be performed. The complex structure of the downlink control channel blind decoding results in increasing false alarm(s). Intelligent rules for pruning the decoding results are employed so that unreliable CRC-passed hypotheses are rejected as a function of respective reliability metric.07-28-2011
20120099676RECEPTION APPARATUS AND METHOD, DEMODULATION APPARATUS AND METHOD, AND PROGRAM - A reception apparatus includes: a reception section configured to receive a signal modulated by one of a single-carrier scheme and a multi-carrier scheme that are specified by a predetermined standard; a single-carrier demodulation section configured to execute single-carrier demodulation based on the single-carrier scheme onto the signal; a multi-carrier demodulation section configured to execute multi-carrier demodulation based on the multi-carrier scheme onto the signal; and a demodulation control section configured to control such that one of the single-carrier demodulation and the multi-carrier demodulation is tried on the received signal in accordance with a preset predetermined rule.04-26-2012
20090110121Programmable Signal Slicer - Disclosed are various embodiments of a programmable slicer in a digital signal processing system and/or software radio system. In one embodiment, a plurality of demodulation schemes and a plurality of channel definitions are stored in a channel allocation table. An analog waveform is received and converted into at least one digital waveform. A specified frequency range is isolated from the at least one digital waveform. The magnitude of tones within the specified frequency range is measured and stored in a signal magnitude table. Symbols and/or bits are decoded from the signal magnitude table by applying a demodulation schemes and channel definitions to the magnitudes stored in the signal magnitude table.04-30-2009
20090147888Receiver Interface - The invention provides a receiver comprising a data input and a strobe input. The strobe signal transitions whenever two consecutive bits in the data signal are the same. The receiver comprises combining means for generating a recovered clock signal from a combination of the data and strobe signals. The receiver also comprises a first sampling stage arranged to sample the data signal in dependence on the recovered clock signal, the first sampling stage comprising a plurality of sampling circuits and being arranged to obtain consecutive samples of the data signal using alternating ones of the sampling circuits. A second sampling stage is arranged to sample the data from the first sampling stage in dependence on a local system clock signal.06-11-2009
20110142178DEVICE AND METHOD FOR CONTROLLING FREQUENCY RESONANCE POINT OF AN ANTENNA - The present invention disclosed an apparatus and method for receiving a plurality of broadcasting signals. The apparatus comprises: a control circuit for generating an analog control voltage signal according to a frequency-voltage look-up table and a desired frequency; an antenna module comprising an antenna and an antenna resonant control circuit comprising a voltage-controlled capacitor being controlled by the analog control voltage signal, wherein the antenna resonant control circuit comprises a voltage-controlled capacitor to control the bandwidth received by the antenna according to the analog control voltage signal; a tuner for tuning a broadcasting signal received by the antenna to generate an output signal; and a demodulator for demodulating the output signal of the tuner.06-16-2011
20110142174APPARATUS AND METHOD FOR DETECTING IMPULSE SIGNAL AND IMPULSE SEQUENCE - Disclosed herein is an apparatus and method for detecting an impulse signal or impulse sequence to realize wireless real-time location system application in a multipath fading environment. The apparatus includes a band-pass filter, an RF analog unit, and a signal processing base-band unit. The band-pass filter removes unnecessary frequency bands from impulse signals received through a receiving antenna. The RF analog unit detects the envelope of the impulse sequence deprived of the unnecessary frequency bands and based on a multipath, and outputs a digital signal regarding the envelope based on a leading edge of the envelope. The signal processing base-band unit performs low-speed 1-bit sampling and then output data, and, if frame synchronization has been found or a ranging command has been detected, performs high-speed 1-bit sampling and then calculates and outputs the propagation time of the impulse signals.06-16-2011
20120288038SYSTEMS FOR PROCESSING DIFFERENTIATED HIERARCHICAL MODULATION USED IN RADIO FREQUENCY COMMUNICATIONS - The present invention employs hierarchical modulation to simultaneously transmit data over different modulation layers using a carrier RF signal. Each modulation layer may be of a higher or lower order than the other modulation layers. Certain embodiments of the present invention may transmit different information on the different modulation layers. Other embodiments of the present invention may use the different layers for processing information differently.11-15-2012
20120288037COARSE BIN FREQUENCY SYNCHRONIZATION IN A COMMUNICATION SYSTEM - For frequency bin error estimation, multiple hypotheses are formed for different frequency bin errors, pilot offsets, or combinations of frequency bin error and pilot offset. For each hypothesis, received symbols are extracted from the proper subbands determined by the hypothesis. In one scheme, the extracted received symbols for each hypothesis are despread with a scrambling sequence to obtain despread symbols for that hypothesis. A metric is derived for each hypothesis based on the despread symbols, e.g., by deriving a channel impulse response estimate based on the despread symbols and then deriving the metric based on the channel impulse response estimate. In another scheme, the extracted received symbols for each hypothesis are correlated, and a metric is derived based on the correlation results. For both schemes, the frequency bin error and/or the pilot offset are determined based on the metrics for all hypotheses evaluated.11-15-2012
20120288036PREDICTING VALUES IN SEQUENCE - Multiple data prediction strategies are received. Each data prediction strategy may predict a next data value in a sequence of data values with a corresponding confidence value. Rather than rely on a single prediction strategy, the predictions of each of the data prediction strategies are linearly combined to generate a single prediction that is more accurate and has a lower overall loss than any of the individual prediction strategies. Further, a deviation is calculated based on the values in the sequence of values that have been observed so far using a weighted sum that favors more recent values in the sequence over less recent values in the sequence. A prediction of the next value in the sequence is generated based on the combined strategies and the calculated deviation.11-15-2012
20120288035BASE-BAND TO RADIO FREQUENCY UP-CONVERTER - A base band to frequency up-converter is described wherein the base band to frequency up-converter comprises a first input for receiving a first base band signal of first base band samples and a second input for receiving a second base band signal of second base band samples and an output for providing up-converted radio signal samples. The base-band to radio frequency up-converter further comprises a phase converter for converting the first base band signal of first base band samples and the second base band signal of second base band samples into a first intermediate signal of first intermediate samples, a second intermediate signal of second intermediate samples, and a third intermediate signal of third intermediate samples. The intermediate samples are then up-converted into radio signal samples.11-15-2012
20120099678Drift Cancellation Technique for Use in Clock-Forwarding Architectures - A circuit includes a frequency synthesizer, N phase mixers coupled to the frequency synthesizer, a plurality of receivers, and a calibration circuit. The frequency synthesizer is to receive a reference clock signal and is to output a primary clock signal. A respective phase mixer in the N phase mixers is to output a respective secondary clock signal having a corresponding phase. A respective receiver in the plurality of receivers is coupled to two of the N phase mixers, and at a respective time is to receive data in accordance with the respective secondary clock signal from one of the two phase mixers coupled to the respective receiver. The calibration circuit is to calibrate a secondary clock signal output by a respective phase mixer in the N phase mixers by adjusting the phase of the secondary clock signal of the respective phase mixer.04-26-2012
20120099677SIGNAL RECEIVING APPARATUS, SIGNAL RECEIVING METHOD AND SIGNAL RECEIVING PROGRAM - A signal receiving apparatus includes: a processing unit configured to carry out Fourier transform on Fourier-transform data serving as a Fourier-transform object and carry out Fourier transform on inverse-Fourier-transform data serving as an inverse-Fourier-transform object; and a control unit configured to output pieces of data obtained as a result of the Fourier transform carried out on the Fourier-transform data in an order, in which the pieces of data have been obtained, in a process of outputting the pieces of data and output other pieces of data obtained as a result of the Fourier transform carried out on the inverse-Fourier transform data by rearranging the other pieces of data in a process of outputting the other pieces of data.04-26-2012
20120294394DELAY DETECTOR CIRCUIT AND RECEIVER APPARATUS - The present invention provides a delay detector circuit that delivers performance at low cost and can reduce power consumption, and a receiver apparatus that uses this delay detector circuit. The delay detector circuit according to the present invention performs a part of decoding processing for decoding data transmitted by a transmitter apparatus based on a received wave of a two-phase modulation method. The receiver apparatus according to the present invention uses the delay detector circuit described above. Therefore the delay detector circuit and receiver apparatus of the present invention deliver performance at low cost and can reduce power consumption.11-22-2012
20120294392SHORT GUARD INTERVAL WITH GREEN FIELD PREAMBLE - Systems, methods, and other embodiments associated with a single stream wireless communication with a greenfield preamble that uses a short guard interval are described. According to one embodiment, a wireless communication device includes a receiver configured to receive an orthogonal frequency-division multiplexing (OFDM) signal. The OFDM signal includes a greenfield preamble. The wireless communication device includes an interval select logic configured to determine a type of guard intervals in the OFDM signal based, at least in part, on the greenfield preamble. The wireless communication device includes a signal processor configured to process the OFDM signal based, at least in part, on the type of the guard intervals as determined by the interval select logic.11-22-2012
20120294393METHOD FOR POST DETECTION IMPROVEMENT IN MIMO - A two-stage approach to MIMO detection improves receiver performance in a computationally tractable manner. A whitening joint detector processes a MIMO symbol stream. The whitening joint detector includes a pre-filter operative to suppress a first subset of the received MIMO streams as colored noise. The whitening joint detector further includes a primary joint detector operative to process a second subset of the MIMO streams and to output a preliminary solution obtained by minimizing a whitening joint detection metric. A secondary detector then operates in the vicinity of the primary joint detector preliminary solution. The secondary detector improves the preliminary solution by comparison to a full joint detection metric.11-22-2012
20110317791OFDM receivers - A method and apparatus for filtering a received Orthogonal Frequency Division Multiplexed (ODFM) signal to reduce noise. The ODFM signal includes a plurality of symbols n in the time direction, each symbol including a plurality of sub-carriers k in the frequency direction, each a-th sub-carrier of each symbol being transmitted as a pilot sub-carrier with known amplitude and phase, and each symbol having its pilot sub-carriers spaced by b sub-carriers relative to the adjacent symbol. An m-tap filter is utilized for producing a filtered version of a selected pilot sub-carrier to be used in subsequent interpolation, by inputting into respective taps of the m-tap filter, m pilot sub-carriers surrounding the selected pilot sub-carrier. The m pilot sub-carriers each satisfy a relationship between n and k, wherein the relationship defines a diagonal line in the n-k plane.12-29-2011
20110299636HIGH-POWER INDUCTION-TYPE POWER SUPPLY SYSTEM AND ITS BI-PHASE DECODING METHOD - A high-power induction-type power supply system includes a supplying-end module consisting of a supplying-end microprocessor, a power driver unit, a signal analysis circuit, a coil voltage detection circuit, a display unit, a power supplying unit, a resonant circuit, a supplying-end coil and a shunt resistor unit, and a receiving-end module consisting of a receiving-end microprocessor, a voltage detection circuit, a rectifier and filter circuit, an amplitude modulation circuit, a protection circuit breaker, a voltage stabilizer circuit, a DC-DC buck converter, a resonant circuit and a receiving-end coil. Subject to time series arrangement, the high-power induction-type power supply system allows transmission of data signal in a stable manner during a charging operation, assuring system operation stability and low power loss. By means of bi-phase decoding, data code is accurately decoded when the receiving-end module is at full load, ensuring system operating reliability.12-08-2011
20110299635SAW-LESS RECEIVER INCLUDING AN IF FREQUENCY TRANSLATED BPF - A SAW-less receiver includes an FEM interface module, an RF to IF receiver section, and a receiver IF to baseband section. The RF to IF receiver section includes a mixing module, a mixed buffer section, and a frequency translated BPF (FTBPF) circuit module. The mixing module converts an inbound RF signal into an in-phase (I) mixed signal and a quadrature (Q) mixed signal. The mixed buffer section filters and buffers the I mixed signal and filter and buffer the Q mixed signal. The FTBPF circuit module frequency translates a baseband filter response to an IF filter response such that the FTBPF circuit module filters undesired signal components of the IF I signal and the IF Q signal to produce an inbound IF signal. The receiver IF to baseband section converts the inbound IF signal into one or more inbound symbol streams.12-08-2011
20110299634SAW-LESS RECEIVER WITH A FREQUENCY TRANSLATED BPF HAVING A NEGATIVE RESISTANCE - A SAW-less receiver includes an FEM interface module, an RF to IF receiver section, and a receiver IF to baseband section. The RF to IF receiver section includes an RF frequency translated bandpass filter (FTBPF), an LNA, and a mixing section. The RF FTBPF frequency translates a baseband filter response to an RF filter response and filters an inbound RF signal in accordance with the RF filter response, wherein the inbound RF signal includes a loss error due to switching loss and/or inductor loss. The RF FTBPF also compensates the loss error based on a negative resistance. The LNA amplifies the compensated inbound RF signal and the mixing section mixes the amplified inbound RF signal with a local oscillation to produce an inbound IF signal. The receiver IF to baseband section converts the inbound IF signal into one or more inbound symbol streams.12-08-2011
20110299632SAW-LESS RECEIVER WITH RF FREQUENCY TRANSLATED BPF - A SAW-less receiver includes an FEM interface module, an RF to IF receiver section, and a receiver IF to baseband section. The RF to IF receiver section includes a frequency translated bandpass filter (FTBPF), an LNA, and a mixing section. The FTBPF includes a switching network and a plurality of baseband impedances. The switching network is operable to couple the plurality of baseband impedances to the FEM interface in accordance with a plurality of phase-offset RF clock signals to RF bandpass filter the inbound RF signal. The LNA amplifies the filtered inbound RF signal and the mixing section mixes the amplified inbound RF signal with a local oscillation to produce an inbound IF signal. The receiver IF to baseband section converts the inbound IF signal into one or more inbound symbol streams.12-08-2011
20110299633MULTIPLE BAND SAW-LESS RECEIVER INCLUDING A FREQUENCY TRANSLATED BPF - A SAW-less receiver includes an FEM interface module, an RF to IF receiver section, and a receiver IF to baseband section. The RF to IF receiver section includes a frequency translated bandpass filter (FTBPF), an LNA, and a mixing section. The FTBPF includes a switching network and baseband impedances. The switching network is operable to frequency translate a baseband filter response to a first RF band frequency response and/or to a second RF frequency band response. The FTBPF filters the inbound RF signal to pass, substantially unattenuated, the first and/or second RF band signal components. The LNA amplifies the first and/or second filtered inbound RF signals and the mixing section mixes the first and/or second amplified inbound RF signals with a corresponding first and/or second local oscillation. The IF to baseband section converts the first and/or second inbound IF signals into first inbound symbol stream(s) and/or second inbound symbol stream(s).12-08-2011
20110299631SAW-LESS RECEIVER INCLUDING TRANSIMPEDANCE AMPLIFIERS - A SAW-less receiver includes an FEM interface module, an RF to IF receiver section, and a receiver IF to baseband section. The RF to IF receiver section includes inverter based LNA modules, a mixing module, and transimpedance amplifier modules. The inverter based LNA modules amplify inbound RF signal to produce a positive leg current RF signal and a negative leg current RF signal. The mixing module converts the positive and negative leg current RF signals into an in-phase (I) mixed current signal and a quadrature (Q) mixed current signal. The transimpedance amplifier modules convert the I mixed current signal into an I mixed voltage signal and the Q mixed current signal into a Q mixed voltage signal. The receiver IF to baseband section converts the I and Q mixed voltage signals into one or more inbound symbol streams.12-08-2011
20110299630Method and Apparatus for Real Time Multiplexing with Receiver and Antenna Array Elements - A method of signal processing, or corresponding apparatus, includes providing multiple analog receive signals at respective antennas and selecting one antenna at a time in an iterative manner, to cycle through the antennas and provide a multiplexed analog signal. The multiplexed analog signal is filtered at a filter to pass a predetermined frequency band. The multiplexed analog signal is sampled at a single analog to digital converter to generate a multiplexed digital signal. The multiplexed digital signal is demultiplexed to generate multiple digital signals for digital processing. Sharing a receiver and ADC among multiple antennas results in reduced cost and power. Such cost and power reductions in turn enable larger antenna arrays than are available with prior art techniques, thereby promoting increased throughput and coverage.12-08-2011
20090185642AUTOMATIC GAIN CONTROL USING SIGNAL AND INTERFERENCE POWER TO OBTAIN EXTENDED BLOCKING PERFORMANCE - In a radio including analog and digital portions, with at least one A/D converter between the analog and digital portions, and the selectivity of the radio at least partly implemented in the digital domain, an AGC controller sets a first variable gain amplifier (VGA) (07-23-2009
20090034660LOW POWER RADIO TRANSMITTER USING PULSE TRANSMISSIONS - A radio receiver includes a low-noise amplifier, pulse-to-signal conversion module, and intermediate frequency stage. The low-noise amplifier is operably coupled to receive and amplify an M-bit signal at a radio frequency. The M-bit signal at a radio frequency is representative of a pulse signal that is carried on a radio frequency. The pulse-to-signal conversion module demodulates the M-bit signal to produce an N-bit signal at an intermediate frequency. For example, the pulse-to-signal conversion module performs pulse-width demodulation, pulse-density demodulation, or pulse-position demodulation to recapture the N-bit signal. The intermediate frequency stage steps down the frequency of the N-bit signal to produce a base-band digital signal.02-05-2009
20110293046COMPLEX SIGNAL PROCESSING CIRCUIT, RECEIVER CIRCUIT, AND SIGNAL REPRODUCTION DEVICE - An analog complex filter combines an in-phase signal and a quadrature signal to output first and second analog signals. An analog-to-digital converter converts the first and second analog signals into first and second digital signals. A digital complex filter attenuates components corresponding to the quadrature signal and the in-phase signal of the first and second digital signals, respectively. A digital bandwidth limited filter allows a target component and an image component contained in the digital complex signal composed of the first and second digital signals from the digital complex filter to pass therethrough, and attenuates an adjacent interference component. An IQ imbalance correction circuit corrects a quadrature error and an amplitude error between the first and second digital signals from the digital band-pass filter.12-01-2011
20110293045METHODS AND SYSTEMS FOR IMPROVING ITERATIVE SIGNAL PROCESSING - A method for iteratively decoding a set of encoded samples received from a transmission channel is provided. A data signal indicative of a noise level of the transmission channel is received. A scaling factor is then determined in dependence upon the data signal and the encoded samples are scaled using the scaling factor. The scaled encoded samples are then iteratively decoded. Furthermore, a method for initializing edge memories is provided. During an initialization phase initialization symbols are received from a node of a logic circuitry and stored in a respective edge memory. The initialization phase is terminated when the received symbols occupy a predetermined portion of the edge memory. An iterative process is executed using the logic circuitry storing output symbols received from the node in the edge memory and a symbol is retrieved from the edge memory and provided as output symbol of the node. Yet further an architecture for a high degree variable node is provided. A plurality of sub nodes forms a variable node for performing an equality function in an iterative decoding process. Internal memory is interposed between the sub nodes such that the internal memory is connected to an output port of a respective sub node and to an input port of a following sub node, the internal memory for providing a chosen symbol if a respective sub node is in a hold state, and wherein at least two sub nodes share a same internal memory.12-01-2011
20120236971SYSTEMS AND METHODS FOR WIRELESS COMMUNICATION IN SUB GIGAHERTZ BANDS - Systems, methods, and devices for wireless communication. In one aspect, an apparatus for wireless communication is provided. The apparatus includes a receiver configured to receive a wireless signal comprising a packet. At least a portion of the wireless signal is configured to be received over a bandwidth lower than or equal to 1.25 MHz. The packet is formed from at least one orthogonal frequency-division multiplexing (OFDM) symbol comprising thirty-two tones. The thirty-two tones correspond to frequency subcarriers within the bandwidth. The thirty-two tones of the at least one OFDM symbol are allocated as: twenty-four data tones, two pilot tones, five guard tones, and one direct current (DC) tone. The apparatus includes a processor configured to evaluate the wireless signal. The processor includes a transform module configured to convert the at least one OFDM symbol into a frequency domain signal using a thirty-two point mode.09-20-2012
20090279644MIMO DECODER AND MIMO DECODING METHOD - A MIMO decoder, which is capable of changing a search area of a transmission signal vector in accordance with a change in a channel matrix, includes: a generalized inverse vector matrix calculation unit for calculating a generalized inverse matrix of Moore-Penrose derived from a channel matrix indicative of a radiowave propagation environment; a search area limiting processing unit for performing weighting for each eigenvector calculated from the channel matrix in inverse proportion to a square root of an eigenvalue corresponding to the eigenvector, and determines the search area of the transmission signal vector centered at the generalized inverse matrix solution of Moore-Penrose based on the weighted result; and a most likelihood estimation unit for searching for a transmission signal vector by use of a most likelihood estimation based on the search area determined by the search area limiting processing unit.11-12-2009
20110007849Multiple protocol software defined radio - A single software defined radio handles both AIS and ORBCOMM communications. A software defined software defined radio detects incoming signals and resolves whether they are AIS or ORBCOMM signals. The signal is directed to a processor in which an algorithm is selected in correspondence with the type of signal which has been recognized. The algorithm extracts intelligence when receiving or encodes intelligence when transmitting. The present software defined radio switches from the ORBCOMM mode to the AIS mode automatically as required in order to maintain a mandatory duty cycle in both the AIS and ORBCOMM modes as defined by regulations, and provides user configurable communications capabilities over both the AIS and ORBCOMM networks in a low-cost, integrated, hardware implementation01-13-2011
20080310559Gain control for reduced interframe spacing (RIFS) - A method and apparatus is disclosed to recover at least one information payload from a frame and/or to configure one or more reception parameters to receive a future frame to support RIFS. A physical layer device (PHY) receives at least a training sequence embedded in the frame of a transmitted communication signal using a receiver filter bandwidth corresponding to a variable filter training sequence bandwidth. The PHY determines an amount of gain necessary to recover an information payload embedded in the frame based on the recovery of the training sequence. The PHY determines an amount of gain necessary to recover an information payload embedded in the frame based on the recovery of the preamble. A previous communications receiver gain is adjusted by the difference between the amount of gain necessary to recover the information payload and the previous communications receiver gain. The PHY adjusts the receiver filter bandwidth from the variable filter training sequence bandwidth to a variable filter information payload bandwidth. The PHY recovers the at least one information payload embedded in frame using the variable filter information payload bandwidth. The PHY adjusts the receiver filter bandwidth from the information payload bandwidth to the variable filter training sequence bandwidth to receive the future frame.12-18-2008
20080310556Apparatus and method for detecting signal in multiple-input multiple-output (MIMO) wireless communication system - Receiving apparatus and method in a Multiple-Input Multiple-Output (MIMO) wireless communication system are provided. The receiver having N-ary receive antennas includes a decomposer for decomposing a channel matrix to a matrix Q and a matrix R through a QR decomposition; a detector for determining a candidate group of an n-th phase by estimating a plurality of transmit signal vectors by substituting a plurality of transmittable symbols into symbol combinations of a candidate group of a (n−1)-th phase as an n-th symbol and detecting (n+1)-th through N-th symbols using characteristics of the matrix R; a calculator for calculating square Euclidean distance values between the transmit signal vectors and a receive signal vector; and a determiner for determining the candidate group of the n-th phase by selecting transmit signal vectors having the smallest square Euclidean distance value among the transmit signal vectors.12-18-2008
20080310555DISTRIBUTED DECODING DEVICE USING MULTI-CORE PROCESSOR AND METHOD FOR THE SAME - Provided is a distributed decoding device using a multi-core processor, including a multi-core processor that includes a plurality of cores which process data as threads; an MPEG division module that receives MPEG data, extracts decoding information from the MPEG data, divides the MPEG data into individual slices, and generates and provides a single-slice decoding function, which separately decodes one slice, such that threads which decode the divided slices allocated thereto are distributed to the cores within the multi-core processor; a memory that includes a plurality of buffers which receive the slices from the MPEG data division module to store therein and provide the stored slices to the cores of the multi-core processor; and a merging module that merges the data decoded through the cores of the multi-core processor.12-18-2008
20080310558Apparatus to reconfigure an 802.11a/n transceiver to support 802.11j/10 MHz mode of operation - A method and apparatus is disclosed to dynamically reconfigure a communications receiver to support one or more single stream modes of operation, multiple stream modes of operation, and/or propriety modes of operation. The communications receiver is configured to support according to a first single stream mode of operation, multiple stream mode of operation, and/or proprietary mode of operation according to a known single stream communications standard, a known multiple stream communications standard and/or a proprietary communications standard. The communications receiver may receive a single stream communications signal and/or a multiple stream communications signal having a second single stream mode of operation, multiple stream mode of operation, and/or proprietary mode of operation according to a known single stream communications standard, a known multiple stream communications standard and/or a proprietary communications standard. The communications receiver may be dynamically re-configured to the second single stream mode of operation, multiple stream mode of operation, and/or proprietary mode of operation to process the single stream communications signal and/or a multiple stream communications signal.12-18-2008
20080310553Baseband Process Method Based on Doubling Sampling - A baseband processing method based on double sampling, including: subjecting a received signal to root raised cosine-filtering process; sampling said signal; conducting channel estimation for every user based on the sampled data; and conducting multi-user joint detection and demodulation for said data. Wherein, the step of sampling said signal includes the following steps: conducting double sampling for said signal, and the interval of the sampling being ½ chip; each chip selecting the average value of two sampling values as the sampling value of the chip; assembling the sampling value of every chip into a data stream. According to the present invention, in the case that the complexity of computation is not increased and only the memory space is doubled, the gain of the received signal in the system is improved effectively, especially when the synchronization of signals is bad, relatively large gain of the signals can be obtained, the system delay is reduced, and the real-time property of signal processing is improved. The method according to the present invention is suitable to the mobile communication system in a bad communication environment.12-18-2008
20100034320METHOD FOR DECODING 2X2 SPATIOTEMPORAL CODES, IN PARTICULAR GOLDEN TYPE CODE - A method is provided for decoding spatiotemporal codes, in particular Golden type code. The received vector is subjected to a MMSE-GDFE filtering, a constellation re-centering to define a Z-matrix, a permutation to obtain X-shaped matrices, a trellis base reduction and a ZF-DFE algorithm by processing the elements of the Z-matrix layer by layer. Each layer includes both elements of the diagonal or anti-diagonal of the Z-matrix.02-11-2010
20100014615Systems and methods for demodulating multiply-modulated communications signals - Embodiments of the present invention provide for an overall hardware and software approach to Mode-S demodulation, especially where the Mode-S signals (such as squitters) have been modulated with multiple modulation protocols. Various implementations utilize coherent phase detection, since coherently detecting phase transitions in a multiple modulated signal results in better sensitivity and improved interference rejection over non-coherent modulation techniques. Further, addressing the demodulation of multiply-modulated signals may also be approached in embodiments of the present invention as a unified demodulation system, rather than disjoint demodulation of the separately modulated protocols.01-21-2010
20100034319DECODING OF BLOCKS IN RADIO COMMUNICATIONS - Apparatuses and methods are disclosed for decoding expected block messages transmitted as radio signals over an air interface in interleaved bursts from a shorter received burst. A method for detecting certain expected messages from received bursts is described, comprising: receiving a one to m bursts of n bursts of an interleaved block message; retrieving stored values for the expected m+1 to n bursts of the interleaved block message; forming an expected interleaved block message; deinterleaving and decoding the expected block message; determining from an error checking whether the expected block message is valid; and if valid, indicating the expected block message was received after receiving only the m bursts. Apparatuses are described for a receiver configured to detect an expected message after receiving m transmitted bursts of an interleaved n burst block message. The expected message may be an empty paging channel or broadcast message.02-11-2010
20100027720CHANNEL ESTIMATING METHOD AND CHANNEL ESTIMATOR - There is provided a channel estimating method of performing frequency conversion by a first fast Fourier transformation on a reception signal and extracting a desired signal after demodulating the reception signal, and deriving electrical energy against time delay of a channel by inverse fast Fourier transformation of the extracted result, wherein: values of a low pass filter, having an output from oversampling the input to the first fast Fourier transformation, are thinned by a plurality of thinning circuits with the same synchronization and different discrete times, and based on the outputs of the plurality of thinning circuits, the electrical energy against time delay related to the reception signal arrival time position is derived by respectively performing the first fast Fourier transformation and the inverse fast Fourier transformation.02-04-2010
20100027718Preamble detection in a Multi-Antenna MIMO 802.16e Receiver - A preamble detector for a plurality of streams of baseband digitized signals has a plurality of preamble processors, each preamble processor coupled to an input and generating an output. Each preamble processor has an input coupled to a first delay, the output of the first delay coupled to a second delay generating an output. The first and second delay are substantially equal to a preamble part. A first multiplier generates an output from a conjugated output of the second delay output and a first delay output. A second multiplier generates an output from a conjugated first delay output and an input stream. The first and second multiplier outputs are accumulated over an interval, and the complex output of the accumulator is formed into a magnitude, thereby generating the output of each preamble processor. The outputs of the preamble processors are summed and compared to a threshold to generate a preamble detect.02-04-2010
20110261906METHOD AND APPARATUS FOR MODULATION RECOGNITION IN COMMUNICATION SYSTEM - A method and an apparatus for modulation recognition in communication system are provided. First, a plurality of constellation corresponding different modulation types are provided, wherein each constellation has a plurality of points. An input signal is de-mapped to find out a nearest point located nearest to a position of the input signal in each constellation. The distances from the nearest points to the position of the input signal are respectively counted to obtain a plurality of distance statistics values corresponding to different modulation types. The apparatus compares the distance statistics values for recognizing the modulation type of the input signal.10-27-2011
20090168925MULTIPATH SIGNAL JUDGING METHOD, PROGRAM, AND MULTIPATH SIGNAL JUDGING DEVICE - A multipath signal judging method includes: performing correlation calculation for I and Q components for a reception signal as a positioning signal modulated in a spread code and a replica code; judging code phase based on the correlation calculation; calculating an angle formed by position vectors of correlation values at advanced phase and delayed phase from the code phase in advanced and delayed directions by N chip (007-02-2009
20110194651SERIAL DATA RECEIVER CIRCUIT APPARATUS AND SERIAL DATA RECEIVING METHOD - A serial data receiver circuit apparatus to receive serial data delimited by a first bit length, the circuit apparatus includes: a serial/parallel converter circuit to convert the serial data into parallel data of a second bit length that is smaller than the first bit length; a data hold circuit to hold a plurality of parallel data; a detector circuit to detect a delimiter position in the received serial data; a detected position hold circuit to generate a select signal to select data included in the parallel data stored in the data hold circuit; and a selector circuit to select data in units of the second bit length starting from the data delimiter position based on the select signal.08-11-2011
20090154604MULTI-DIMENSIONAL DETECTOR FOR RECEIVER OF MIMO SYSTEM - Provided are a multi-dimensional detector for a receiver of an MIMO system and a method thereof. The multi-dimensional detector includes a first symbol detecting unit for calculating symbol distance values using an upper triangular matrix (R) obtained from QR decomposition to detect an m06-18-2009
20080310554Method and apparatus for multiple antenna communications, and related systems and computer program - An embodiment of an arrangement for detecting sequences of digitally modulated symbols from multiple sources. The arrangement identifies a suitable set of candidate values for at least one transmitted sequence of symbols and determines for each candidate value a set of sequences of transmitted symbols. The arrangement estimates at least one further set of sequence of transmitted symbols, calculates a metric for each sequence of transmitted symbols and selects the sequence that maximizes the metric. At the end, a-posteriori bit soft output information for the selected sequence is calculated from the metrics for said sequences. Generally, these calculations are base on the information coming from a channel state information matrix and a-priori information on said modulated symbols from a second module, such as a forward error correction code decoder.12-18-2008
20100124300METHOD AND SYSTEM FOR RECEIVER SYNCHRONIZATION - Provided is a method for synchronizing a multiple carrier receiver to receive a transmitted signal. The method includes determining a location of one or more scattered pilot carriers in a received symbol sequence and modulating the scattered pilot carriers in accordance with a single pseudorandom binary sequence. The method also includes performing phase error correction via the modulated scattered pilot carriers.05-20-2010
20100119017METHOD AND SYSTEM FOR A 4X2 SFBC/STBC SYSTEM WITH 2 SPATIAL STREAMS USING ANGLE FEEDBACK - Aspects of a method and system for a 4×2 SFBC/STBC system with 2 spatial streams using angle feedback are presented. Aspects of the system include a 4×2 SFBC/STBC communication diversity system with 2 distinct spatial streams using angle feedback. A receiving station may concurrently receive signals. A channel estimate matrix may be computed based on the received signals. A rotation angle value may be computed based on the channel estimate matrix. The receiving station may transmit the computed rotation angle via feedback information to a transmitting station. The transmitting station may utilize the received feedback information to generate a plurality of 4 distinct transmit chain signals based on data symbols received via a plurality of 2 spatial streams. Each of the distinct transmit chain signals may comprise a plurality of codewords. The transmitting station may concurrently transmit the plurality of transmit chain signals via the plurality of transmitting antennas.05-13-2010
20080205557Systems and Methods for Performing External Correction - A system is provided for performing external correction to reduce, or eliminate, the frequency dependent response related to an external device for receiving analog signals. The system includes an ADC and a spectrum processor for converting time-domain digital data into a spectrum. An external correction is provided between the ADC and the spectrum processor to reduce, or eliminate, the frequency dependent response associated with the external device. A corresponding method is provided that determines the frequency response of the external device, determines the gain at the center frequency, determines the normalized frequency response, constructs and inverse filter and applies the inverse filter to the digitized time-domain data and scales the results prior to any conversion, or transformation, into the frequency domain.08-28-2008
20090310716CHANNEL BIT DETECTION SYSTEM - A channel bit detection system is provided. The channel bit detection system includes an RF front end, an analog-to-digital converter, a combiner, a length estimator, a length accumulator, an offset control, and a channel bit detector. The RF front end receives an RF signal, and is then digitized at a sampling rate R into a plurality of samples by the analog-to-digital converter. The combiner produces combined samples by shifting the plurality of samples an offset value. The length estimator estimates a length of each two consecutive combined samples. The length accumulator produces land lengths and pit lengths of the combined samples according to length of each two consecutive combined samples. The offset control provides the offset value according to the land lengths and the pits lengths. The channel bit detector recovers the channel bit from the plurality of combined samples.12-17-2009
20120189084SYSTEMS AND METHODS FOR SELECTING DIGITAL CONTENT CHANNELS USING LOW NOISE BLOCK CONVERTERS INCLUDING DIGITAL CHANNELIZER SWITCHES - Systems and methods in accordance with embodiments of the invention include converting satellite signals to an intermediate frequency signal for content decoding, and selecting modulated digital data within the satellite signals for content decoding using digital signal processing. One embodiment includes a system configured to select at least one content channel from an input signal including a plurality of content channels modulated onto a carrier, the system including: a digital channelizer switch including: a high speed analog to digital converter configured to digitize an intermediate frequency signal; a digital channelizer configured to digitally tune a content channel from the digitized intermediate frequency signal; and a high speed digital to analog converter configured to generate an analog output signal using the content channel digitally tuned from the digitized intermediate frequency signal by the digital channelizer.07-26-2012
20120189083Interference Cancellation Based On Interfering Link IL Signal Quality And Related Methods And Devices - A target link signal may be received at a receiving device with the target link signal being received in a received signal also including an interfering link signal. A quality of the interfering link signal in the received signal may be estimated at the receiving device to provide an estimated interfering link signal quality. One of a plurality of interference cancellation techniques may be selected responsive to the estimated interfering link signal quality, and an interference cancellation signal may be generated using the selected one of the plurality of interference cancellation techniques. Information of the interference cancellation signal may be incorporated in the received signal. Responsive to incorporating information of the interference cancellation signal in the received signal, the received signal may be demodulated to provide a demodulated target link signal, and the demodulated target link signal may be decoded to provide a target link bit stream.07-26-2012
20100119016FFT-BASED PILOT SENSING FOR INCUMBENT SIGNALS - The presence of an incumbent signal is detected in order to allow secondary users to share spectrum white space with incumbent users who have pre-emptive access to the spectrum. The spectrum is relinquished to the incumbent user to preclude any potential harmful interference and enable spectrum sharing. The presence of an incumbent signal (05-13-2010
20090207947Efficient Diversity Combining for Wideband Downlink - A communication system employing site diversity combing to increase link availability includes at least two receivers at receive sites within a single downlink beam separated by enough distance to provide decorrelation of weather phenomena—such as rain fade outages. A signal transmits digital symbols to all the receivers and may use bandwidth efficient modulation with forward error correction coding. Sampled symbol values for each codeword are produced at each receiver, which are connected by one or more ground links so that all data can be collected at one site. At least two different soft-decision computation modules translate the sampled symbol values from the different receivers into different sets of soft-decision values—which may be log-likelihood-ratio (LLR) values reflecting the probability value for each bit of the codeword—that are digitally synchronized and combined for use by a decoder. The technique thus avoids disadvantages of either coherent waveform combining or BER-based digital switching.08-20-2009
20090207946GROUPING BITS INTERLEAVING APPARATUS AND METHOD THEREOF - An grouping bits interleaver includes a grouping bits unit and a data storage unit. The grouping bits unit is used for storing N data bits of an input data and outputting an address signal. Wherein each data bit is stored according to a bit position. The data storage unit coupled to the grouping bits unit is used for saving the content of the grouping bits according to the address signal. Compared to the conventional interleaver, the grouping bits interleaver has better memory usage, less access time, and smaller memory size.08-20-2009
20090207945WIRELESS RECEIVER - A wireless receiver having improved receiving characteristics is provided. The wireless receiver (08-20-2009
20100080326RDS/RBDS DECODER WITH RELIABLE VALUES - A method is provided that contemplates including filtered decode values in an RDS/RBDS output signal. The filtered decode values are generated from reliable values. The reliable values are generated from corresponding received values from each of at least two groups of RDS/RBDS data in an RDS/RBDS input signal. The method also comprises preventing an error correction code (ECC) unit from modifying the filtered decode values in the RDS/RBDS output signal.04-01-2010
20090086854RECEIVER - In a receiver to process a received signal including one or more carrier signals, an FFT processing section executes FFT processing on the received signal to obtain FFT processing results at, for example, four points. On the basis of the FFT processing results from the FFT processing section, a selecting section selects one point from a plurality of, e.g., four points. An FFT processing result corresponding to the point selected by the selecting section is used for demodulation processing.04-02-2009
20090086853Wireless Communication Systems and Methods Using Flexible Length Indicators - A wireless communication device includes a data receiving interface, a data processing device coupled with the data receiving interface, and a processing device coupled with the data receiving interface. The data receiving interface is configured to receive a first sub-group and a second sub-group of data for transmission. The first sub-group of data includes data contents for providing at least a portion of a first service, and the second sub-group of data includes data contents for providing at least a portion of a second service. The data processing device is configured to combine the first sub-group of data and the second sub-group of data as a portion of a data transmission group. The processing device is configured to provide a size of a first length indicator based at least on a size of the data transmission group. The first length indicator is configured to indicate a size of the first sub-group of data. The processing device is also configured to provide a size of a second length indicator based on one or more numbers or considerations, such as (a) the size of the first length indicator; (b) the size of the first sub-group of data; (c) the size of the data transmission group; and (d) the size of a header section. The second length indicator is configured to indicate the size of the second sub-group of data.04-02-2009
20100086084ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING DEMODULATOR - An OFDM demodulator which does not require a reference signal for synchronization of carriers and can reduce influence of phase rotation by a propagation path when carrier synchronization is made. The OFDM demodulator performs Fourier transform plural times in 2 or more different operation ranges for the same OFDM symbol, calculates phases of sub carriers from the plural-time results of the Fourier transform, compares the calculated phases for each of the plural-time results of the Fourier transform and detects an error in frequency of reproduction carrier from the compared results.04-08-2010
20110170637SIGNAL SEPARATOR - A device for separating uncoordinated co-channel signals including a symbol detector.07-14-2011
20090262869Decision-Feedback Detection for Block Differential Space-Time Modulation - Time variation on fading channels hinders accurate channel estimation in differential space-time modulation and deteriorates the performance. Decision-feedback differential detection is employed for block differential space-time modulation, and compared with conventional differential space-time modulation. It is observed that the proposed scheme does not suffer effective fading bandwidth expansion, as does the conventional scheme. An improved effective signal-to-noise ratio approach is proposed for analyzing the performance of the proposed scheme in time-varying flat Rayleigh fading. Theoretical analysis and simulations show the improved performance of the proposed scheme over the conventional scheme.10-22-2009
20090262868SIGNAL DECODER WITH GENERAL PURPOSE CALCULATION ENGINE - Some embodiments disclosed herein provide a signal decoder with a general purpose calculation engine. A system for decoding signals in a wireless communication system can include: a controller including an instruction counter; a program memory configured to store program code for operating the controller; a general purpose calculation engine configured to perform primitive operations derived from algorithms for decoding a plurality of coded signals received via a plurality of receive antennas; and a data memory connected to the general purpose calculation engine for storing data generated by the general purpose calculation engine while performing the primitive operations.10-22-2009
20090262867BITSTREAM NAVIGATION TECHNIQUES - A request may be received to navigate through a bitstream by a navigation time, the bitstream having a plurality of data sequences, each of the plurality being associated with a different presentation time of the bitstream. The navigation time may be correlated with a number of bytes from a current location of the bitstream to a target location of the bitstream. The bitstream may be navigated to reach the target location within the bitstream, based on the number of bytes. Navigation may then occur from an initial start code proximate to the target location within the bitstream to a further start code until a final start code is reached that has a timestamp which, compared to a timestamp of the current location, indicates a presentation time that corresponds to the navigation time and thereby satisfies the request.10-22-2009
20090110120WIRELESS COMMUNICATIONS APPARATUS - Lattice reduction aided MIMO detection is disclosed for a packet based signal comprising a header and one or more data symbols. The detector comprises a pre-processing section operable to derive channel decoding information on the basis of a channel estimate from the header, storage means operable to store the channel decoding information, and a data processing section operable to process the one or more data symbols with reference to the stored channel decoding information.04-30-2009
20110170641DOUBLE FREQUENCY-CONVERSION RECEIVING CIRCUIT AND METHOD USED FOR RADIO-FREQUENCY SIM CARD - A double frequency-conversion receiving circuit used for a radio-frequency SIM card, including a low-noise amplifier (07-14-2011
20110170639MULTIPLIER-LESS DATA PROCESSING TECHNIQUES AND RELATED IMPLEMENTATIONS ADAPTED FOR USE IN POLAR MODULATOR - A modulator performs data processing operations such as interpolation and fractional delay adjustment on amplitude and/or phase data by performing shift operations in lieu of multiplication operations. In selected embodiments, the modulator samples input data at a first rate, processes the sampled input data using the first rate, and then interpolates the processed data to produce interpolated data. The modulator then samples the interpolated data at a second rate higher than the first rate and generates output data at the second rate.07-14-2011
20110170638METHOD AND SYSTEM FOR SPATIAL CHANNEL STATE INFORMATION FEEDBACK BASED ON A KRONECKER PRODUCT - A spatial channel state information (CSI) feedback technique is incorporated into multiple-input multiple-output mobile communications technologies. Spatial channel state information is measured at receiving equipment and then decomposed into components. The components are then quantized using codebook(s) and fed back as multiple indices to transmitting equipment.07-14-2011
20090274245APPARATUS AND METHODS HAVING MAJORITY BIT DETECTION - Electronic apparatus and fabrication of the electronic apparatus that includes detection of the majority of values in a plurality of data bits may be used in a variety of applications. Embodiments include application of majority bit detection to process data bits in a device for further analysis in the device based on the results of the majority bit detection. In an embodiment, such further processing in a memory device after majority bit detection may include data bit inversion prior to outputting the data from the memory device.11-05-2009
20090296861System and Method for Multiple Signal Carrier Time Domain Channel Estimation - The present invention provides a method of characterizing a frequency response of a transmission channel between a transceiver and a subscriber unit. The method includes once per predetermined interval of time, the transceiver transmitting a signal including multiple carriers, a plurality of the carriers including training symbols, a plurality of the carriers including information symbols. The subscriber unit generates frequency response estimates at the frequencies of the carriers including training symbols, each interval of time. The frequency response estimates are converted into a time domain response generating an impulse response once per interval of time. The impulse responses are filtered over a plurality of intervals of time. A channel profile is determined from the filtered impulse responses. The channel profile is converted to the frequency domain generating a channel interpolator. The characterized frequency response is generated from the channel interpolator and the frequency response estimates. The filtering can include averaging the impulse responses over a plurality of intervals of time, accumulating the impulse responses over a plurality of intervals of time, or weighted averaging of the impulse responses over a plurality of intervals of time. The weighted averaging can be dependent upon a phase error between the impulse responses, and/or an amplitude error between the impulse responses.12-03-2009
20090103657DIGITAL BROADCASTING TRANSMISSION/RECEPTION SYSTEM CAPABLE OF IMPROVING RECEIVING AND EQUALIZING PERFORMANCE AND SIGNAL PROCESSING METHOD THEREOF - A digital broadcast transmitting and receiving system and a signal processing method thereof that improves the receiving performance of the system. A digital broadcast transmitter includes a randomizer to receive and randomize a data stream into a specified position of which stuff bytes are inserted, a replacement sequence generator to generate known data including a predefined sequence, a stuff-byte exchange unit to insert the known data into the specified position of the data stream into which stuff bytes are inserted, an encoder to encode the data stream output from the stuff-byte exchange unit for an error correction, and a transmission unit to modulate the encoded data stream, RF-convert the modulated data stream and transmit the RF-converted data. The digital broadcast receiving performance is improved even in an inferior multi-path channel by detecting the known data from the received transmission and using the known data for synchronization and equalization in a digital broadcast receiver.04-23-2009
20090296860ADAPTIVE CORRELATION - A method is provided for correlating samples of a received signal and samples of an internally generated/stored sample sequence (“IGSSS”). The method involves performing a first iteration of a first-resolution correlation state. The first-resolution correlation state involves: selecting a first N sets of samples from the received signal; selecting a first set of samples from the IGSSS; and concurrently comparing each of the N sets of samples with the first set of samples to determine if a correlation exists between the same. If it is determined that a correlation does not exist between one of the N sets of samples and the first set of samples, then a second iteration of the first-resolution correlation state is performed. If it is determined that a correlation exists between one of the N sets of samples and the first set of samples, then a first iteration of a second-resolution correlation state is performed.12-03-2009
20090041163Selecting Delay Values for a RAKE Receiver - Multipath components of transmitted data symbols are received with individual delays and processed by a RAKE having a number of fingers. A delay profile indicating magnitudes for a first number of delay values is provided. Estimated magnitudes for a second number of delay values located between the first number of delay values are calculated by interpolation, and a combined delay profile is provided by combining the magnitudes for the first and second number of delay values. Delay values for peaks in the combined delay profile are determined, and a number of peak delay values (P02-12-2009
20100111232METHOD AND APPARATUS FOR ITERATIVE RECEIVER STRUCTURES FOR OFDM/MIMO SYSTEMS WITH BIT INTERLEAVED CODED MODULATION - The techniques and components described herein may improve the performance for a class of reduced-complexity receiver designs for coded OFDM MIMO systems with bit interleaved coded modulation. The receiver structures described are soft-input soft-output inner/outer decoder receiver structures that include one or more of the following: 1) an inner decoder that includes a linear front-end followed by a limited tree-search based on a soft-output M-algorithm; 2) a conventional near-optimal or optimal decoder for the outer binary code; and 3) iterative decoding (ID), whereby decoding (output) information is passed from one decoder module as input to the other and used to refine and improve the inner/outer decoding module outputs.05-06-2010
20110200148SYSTEMS AND METHODS FOR LOW-COMPLEXITY MIMO DETECTION WITH ANALYTICAL LEAF-NODE PREDICTION - Systems and methods for providing multiple-input multiple-output (MIMO) detection, comprising a leaf node predictor for receiving a processed communications stream, computing at least one channel metric corresponding to the communications stream for a given channel realization by optimizing a predetermined probability, and analytically generating at least one parameter to output, which at least one parameter corresponds to at least one predicted best leaf node candidate for the given channel realization. The leaf-node predictor may generate, in real-time and without using a look-up table, at least one parameter directly from a given channel metric. Some embodiments analytically generate at least one parameter value for use by a MIMO detector corresponding to a channel metric and store the generated at least one parameter value and corresponding channel metric in a look-up table.08-18-2011
20080212719Motion vector detection apparatus, and image coding apparatus and image pickup apparatus using the same - A search range setting unit sets a search range to be matched with a targeted region of an image to be coded, in a reference image. A computing unit performs computation in a manner such that matching between the targeted region and a region within the search range is computed from a resolution lower than that of an original image toward the resolution of the original image over a plurality of hierarchies and the search range is narrowed. The search range setting unit sets a plurality of search ranges in the reference image in at least one of the plurality of hierarchies.09-04-2008
20110268230OPTIMIZING A RECEIVER FOR MULTIPLE ANTENNA CONFIGURATIONS - A method for optimizing a multiple input multiple output (MIMO) receiver for multiple antenna configurations is disclosed. A noise covariance is determined based on a noise estimate of a wireless signal. A Cholesky decomposition matrix is determined based on the noise covariance. A whitening matrix is determined based on the Cholesky decomposition matrix. The wireless signal is whitened using the whitening matrix.11-03-2011
20100061489Power Saving Apparatus and Method of Multiple-Antenna Receiver with Variable Rate - A multiple-antenna receiver can enable and disable receive radio frequency front-end and analog front-end circuits of specific antenna receiving routes according to a predetermined scheme during the receive data phase. The predetermined scheme calculates signal quality indices of the receiving route antennas by means of a preamble sequence, and derives the modulation and coding scheme and the number of spatial streams via the information provided by a header sequence. Indications of the signal quality indices are compared with threshold values to determine which receiving routes are to be turned on and which receiving routes are to be turned off.03-11-2010
20090310718Data distribution system and reception apparatus - In a data distributing party, original data is divided into sub-blocks. Each sub-block is encoded according to a predetermined encoding/decoding formula, to divide each sub-block into sub-symbols. In the predetermined encoding/decoding formula, data prior to encoding can be restored by obtaining a predetermined number of data from data posterior to encoding. Each symbol is generated by retrieving sub-symbols from respective sub-blocks and each generated symbol is distributed. In contrast, in a data receiving party, when completing the reception of the symbols not less than a predetermined number necessary for restoring, the sub-symbols are extracted from the respective received symbols in an order of receiving the symbols to restore the sub-blocks posterior to encoding. Each restored sub-block posterior to encoding is decoded according to the above encoding/decoding formula to restore each corresponding sub-block prior to encoding. The restored sub-blocks are then joined to one another to restore the original data.12-17-2009
20100142654METHOD AND APPARATUS FOR SIGNAL DETECTION BASED ON MMSE IN MIMO COMMUNICATION SYSTEM - In a multi-input multi-output communication system receiving signals transmitted through a plurality of transmission antennas by using a plurality of reception antennas, a matrix determining a position of a symbol to be detected from a received signal is calculated at a first symbol detection step, and from the subsequent step, a matrix at the current step is acquired through a simple relationship from the matrix calculated at the previous step to determine a position of a symbol to be detected.06-10-2010
20100142653A/D CONVERSION APPARATUS, A/D CONVERSION METHOD, AND COMMUNICATION APPARATUS - An A/D conversion apparatus includes: a first and a second D/A converter to sample an analog signal and successively compare the analog signal and a reference signal to generate a first and a second comparison signal respectively; a first comparator to compare the first comparison signal generated by the first D/A converter with a benchmark signal; a second comparator to compare the second comparison signal generated by the second D/A converter with the benchmark signal; and a converter to convert the analog signal to a digital signal according to results of the comparisons by the first and second comparators.06-10-2010
20110206165MOBILE WIRELESS APPARATUS - A mobile wireless apparatus wherein matching circuits can be independently designed, while the increase in the circuit scale can be suppressed and the cost can be reduced. In this apparatus, a filter (08-25-2011
20090168924SCALABLE ARCHITECTURE FOR SATELLITE CHANNEL SWITCH - A frequency translation module for a broadband multi-channel communication system may include an analog signal converter, a digital channel selection device, and a digital-to-analog (D/A) converter. The analog signal converter is configured to receive a plurality of analog signals, to select analog signals residing in a predefined frequency band, and to convert each of the selected analog signals into a digital signal. The digital channel selection device is configured to process digital signals corresponding to the selected analog signals and to generate a composite output of digital signals representative of the selected analog signals. The D/A converter is configured to translate the composite output to an analog signal output decodable by a receiver. Further, the frequency translation module may include a mixer configured to upconvert the analog signal output to a frequency decodable by the receiver.07-02-2009
20090052589TRANSPORT STREAM GENERATING DEVICE, TRANSMITTING DEVICE, RECEIVING DEVICE, AND A DIGITAL BROADCAST SYSTEM HAVING THE SAME, AND METHOD THEREOF - A transport stream (TS) generating apparatus, a transmitting apparatus, a receiving apparatus, a digital broadcast system having the above, and a method thereof are provided. The digital broadcast system includes a transport stream (TS) generating apparatus which generates a multi transport stream (TS) by multiplexing a normal stream and a turbo stream having a variable coding rate, a transmitting apparatus which re-constructs the multi TS by processing the turbo stream, and transmits the re-constructed multi TS, and a receiving apparatus which receives the re-constructed multi TS, and decodes the normal stream and the turbo stream respectively, to recover normal data and turbo data. Accordingly, a multi TS, which includes normal stream and a turbo stream of various coding rates, can be transmitted and received efficiently.02-26-2009
20080273628Data sampling circuit and data sampling method - A data sampling circuit and a data sampling method for performing sampling at a frequency lower than a carrier frequency. An infrared communication signal converted to an electric signal is input to a data sampling circuit, and a signal in a band lower than or equal to the carrier signal frequency is extracted by an LPF. After the communication signal is input from the LPF, a detection information retention block specifies detection information indicating that the communication signal has been detected and retains the detection information. The detection information in a previous sampling cycle and the detection information in the current sampling cycle are compared to determine whether the communication signal has been input. A measurement block measures a period in which the input of the communication signal continues or a period in which the communication signal is not input, in accordance with the detection result.11-06-2008
20080273629UWB RECEIVER DESIGNS BASED ON A GAUSSIAN-LAPLACIAN NOISE-PLUS-MAI MODEL - Two novel receiver structures which surpass the performance of the conventional matched filter receiver are proposed for ultra-wide bandwidth multiple access communications. The proposed receiver structures are derived based on a more appropriate statistical model for the multiple access interference than the generally used Gaussian approximation.11-06-2008
20080273627Information-Detecting Apparatus and Method - An information-detecting apparatus (11-06-2008
20080292025Low Density Parity Check (Ldpc) Code Decoder - A message-passing decoder for low-density parity-check codes (LDPC) is provided using a multi-value threshold scheme which is updated throughout the decoding iterations. In an embodiment the check node processing is implemented using the min-sum principle whereby for each corresponding row of the parity check matrix a first and a second minimum value among bit reliability values is determined. Each row of the decoder comprises one or more associative processing elements controlled by a row control element to determine the two minimum values. Each column comprises one or more associative processing elements, an input processing element, and a column control element to determine hard decision bits. The usage of processing elements to construct a decoder may reduce the gate count and decrease the interconnects used to couple the elements.11-27-2008
20080304600SIGNAL PROCESSOR FOR ESTIMATING SIGNAL PARAMETERS USING AN APPROXIMATED INVERSE MATRIX - A device that estimates information from a signal includes a receiver for receiving an input signal and electronic processing circuitry. The electronic processing circuitry generates a matrix associated with the input signal and determines an approximation of an inverse of the matrix based on the adjoint of the matrix and a scaling factor associated with the determinant of the matrix. This approximation avoids possible mathematical difficulties that may be encountered in certain situations when a typical matrix inversion is calculated. The approximated inverse matrix is applied to the input signal to transform the input signal into an output signal. Information associated with the input signal is then determined based on the output signal.12-11-2008
20080212718Multi-Rate Tracking Circuit - A multi-rate tracking circuit with an input for a signal, an output arranged to indicate a current proposed level related to the signal, and voting logic connected to the input, arranged to indicate of a direction of change in the current proposed level. A first counter is connected to the voting logic, and arranged to vary the current proposed level based on the indications received from the voting logic. A second counter is arranged to vary a value based on the indications from the voting logic. The variation of the current proposed level by the first counter is dependent on the value varied by the second counter.09-04-2008
20110268231METHOD FOR QR-MLD DEMODULATION - A method for QR-MLD demodulation includes the steps of: determining a transmission reception mode; receiving symbols represented by a received symbol vector; generating a channel matrix; performing QR decomposition on the channel matrix to compute an unitary matrix and an upper triangular matrix; processing the received symbol vector by multiplying the received symbol vector by the Hermitian of the unitary matrix; determining whether a conjugate calculation will be required to set a conjugate flag; computing a first distance metric by performing a conjugate or non-conjugate first distance metric calculation depending on the conjugate flag; computing an estimated symbol by performing a conjugate or non-conjugate estimated symbol calculation depending on the conjugate flag; mapping the estimated symbol to a constellation; computing a second distance metric by performing a conjugate or non-conjugate second distance metric calculation depending on the conjugate flag; computing a total distance metric by summing the first and second distance metrics; and calculating the soft bits.11-03-2011
20090190696METHOD AND SYSTEM FOR ESTIMATING PARAMETERS OF A MULTI-TONE SIGNAL - There is provided a method and a system for estimating parameters of a multi-tone signal made up of at least one single-tone signal, wherein the method comprises: generating time samples of the multi-tone signal by using a sampler; calculating the discrete Fourier transform (DFT) frequency samples by using a processing unit; calculating an intermediate vector from the calculated discrete Fourier transform (DFT) frequency samples by using the processing unit; defining coefficients of a polynomial from the components of the intermediate vector; calculating the roots of the polynomial by using the processing unit; calculating an amplitude-related vector from at least the roots of the polynomial by using the processing unit; and calculating estimates of the parameters of the multi-tone signal from the roots of the polynomial and the amplitude-related vector.07-30-2009
20090304115DECODING MEDIA CONTENT AT A WIRELESS RECEIVER - A wireless receiver (12-10-2009
20090161798WIRELESS RECEIVING SYSTEM WITH AN ADAPTIVELY CONFIGURABLE ANALOG TO DIGITAL CONVERTER - A circuit is disclosed that comprises a controller and an analog to digital converter (ADC) coupled to controller. The speed and/or the resolution of the ADC is configurable to provide optimum performance during the operation of the ADC. In an embodiment a wireless receiver with an adaptively configurable ADC for is provided. The speed and resolution the ADC is configurable depending on the operational mode of the receiver. Accordingly, through the use of an adaptively configurable ADC, power consumption and speed is optimized for each operational mode.06-25-2009
20090129513Apparatus, methods, and computer program products providing partial MIMO reception and decoding - In a first aspect, there are received m transmitted signals of a multiple input/multiple output transmission comprising n transmitted signals corresponding to n streams of n different polarizations, where n is a positive integer greater than one, and m is an integer less than n. The m received signals are decoded to obtain information for the corresponding streams. Apparatus and computer programs to implement the invention are also detailed.05-21-2009
20090129512DIGITAL BROADCASTING TRASMISSION/RECEPTION SYSTEM HAVING IMPROVED RECEIVING PERFORMANCE AND SIGNAL PROCESSING METHOD THEREOF - A digital broadcasting transmission/reception system having improved receiving performance and signal processing method thereof. A digital broadcasting transmitter according to the present invention includes a data pre-processor which processed robust data and generates robust data packet of predetermined format, a TS stream generator which combines robust data packet with a normal data packet to generate a TS stream of a predetermined format, a randomizer which randomizes the TS stream output from the TS stream generator, a convolution encoder which performs convolution encoding with respect to the robust data of the data output from the randomizer, and a RS encoder which performs RS encoding with respect to the data output from the convolution g encoder. Accordingly, digital broadcasting receiving performance can be improved in a poor multipath channel, while maintaining compatibility with existing transmission/reception system.05-21-2009
20090185641METHOD AND SYSTEM FOR DETECTING NARROWBAND SIGNALS USING A RECEIVER WITH A WIDEBAND FRONTEND07-23-2009
20090129511STAGGEREDPILOT TRANSMISSION FOR CHANNEL ESTIMATION AND TIME TRACKING - To allow a receiving entity to derive a longer channel estimate while limiting overhead, a transmitting entity transmits a pilot on different groups of subbands in different time intervals. N subbands in the system are arranged into M non-overlapping groups. Each group includes P=N/M subbands that are uniformly distributed across the N subbands. The transmitting entity transmits the pilot on a different subband group in each time interval, and selects all M subband groups in M time intervals based on a pilot staggering pattern. The receiving entity derives (1) an initial impulse response estimate with P channel taps based on the pilot received on one subband group and (2) two longer impulse response estimates with different lengths used for data detection and time tracking. Each longer impulse response estimate may be derived by filtering initial impulse response estimates for a sufficient number of subband groups using a time-domain filter.05-21-2009
20120069939COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A wireless communication apparatus and a wireless communication method wherein even when the permissible delay amount of data is small, the permissible delay thereof can be satisfied. A data type determining part (03-22-2012
20120069938Amplitude Monitor For High-Speed Signals - A serial communication system includes a receiver with an amplitude monitor. The amplitude monitor compares the input signal with a reference level in response to a sample clock. The sample clock is periodically phase shifted with respect to the incoming data so the amplitude monitor is sure to sample an incoming data eye at or near the peak amplitude over a selected sample period. The amplitude detector notes the detection of an input signal if the input signal surpasses the reference level for any sample phase. The amplitude monitor experiments with different sample-clock phases over a number of data symbols, but is capable of measuring amplitude fast enough to resolve amplitude-based signals used for rate negotiation.”03-22-2012
20120069937METHODS AND SYSTEMS FOR IMPROVED CHANNEL ESTIMATION IN MULTI-CARRIER SYSTEMS - Wireless receiver circuits and methods include algorithms for switching between a least-squares/minimum mean-square error method of channel estimation known as the CE algorithm, and a continuous plot method of channel estimation known as the CPCE algorithm based upon channel characteristics to improve reception of wireless communications in different reception conditions. In an embodiment, the CPCE algorithm may be selected by a processor for use in channel estimation when a calculated number of candidate paths is less than or equal to a first threshold value, a calculated power ratio of the L strongest paths to the total of all paths is greater than or equal to a second threshold value, and the maximum Automatic Gain Control variation is greater than or equal to a third threshold value. Threshold values may be based on field testing, and set to values at which the CE or CPCE algorithm exhibits better performance.03-22-2012
20120069936MOBILE WIRELESS COMMUNICATIONS DEVICE AND RECEIVER WITH DEMODULATION AND RELATED METHODS - A mobile wireless communications device may include an antenna, and a receiver coupled to the antenna and being configured to use a modulation having memory for a received message in a block structure. The block structure may include a pair of mini-probes and a body therebetween. The receiver may be configured to demodulate the received message by determining a corresponding set of received signal characteristic values based upon the pair of mini-probes, and determining a decode starting point in the body based upon the set of received signal characteristic values. The receiver may be configured to demodulate the received message by at least, from the decode starting point, decoding the body in a first time direction, and decoding the body in a second time direction based upon a result of the decoding in the first direction.03-22-2012
20080317172METHOD AND APPARATUS FOR SIGNAL DETECTION AND MATRIX DECOMPOSITION - A method for computing a factor matrix of an inversion of a matrix, wherein the method comprises the steps of: computing a factor matrix of an inversion of a sub-matrix of a matrix, and recursively obtaining the factor matrix of the inversion of the matrix by using the matrix and the computed factor matrix of the inversion of the sub-matrix of the matrix; and an apparatus for computing the factor matrix of the inversion of a matrix, which can reduce the computational complexity in the signal detection and matrix decomposition and can be implemented with hardware easily.12-25-2008
20090016468METHOD FOR ERROR COMPENSATION IN AN OFDM SYSTEM WITH DIVERSITY - A method provides for an improved compensation Fourier channel characteristics in a wireless communication embodiment. The method identifies one or more information carriers as pseudo pilot tones whose information may be realized to enhance the determination of the complex coefficient of the communication channel.01-15-2009
20090022249DIGITAL BROADCAST RECEIVING DEVICE - A receiving apparatus includes a demodulation means for demodulating a transmission signal to output a demodulation output having a predetermined number of bits; a reliability calculation means for calculating reliability of the transmission signal to output reliability information; a conversion processing means for reducing the number of bits of the demodulation output on the basis of the reliability information, and for multiplexing the demodulation output having the reduced number of bits and the reliability information to output the multiplexed result; and a deinterleave means for deinterleaving the output of the conversion processing means.01-22-2009
20090046815BROADCASTING RECEIVER AND BROADCAST SIGNAL PROCESSING METHOD - A digital broadcasting system which is robust against an error when mobile service data is transmitted and a method of processing data are disclosed. The mobile service data is subjected to an additional coding process and the coded mobile service data is transmitted. Accordingly, it is possible to cope with a serious channel variation while applying robustness to the mobile service data.02-19-2009
20090080575Method for near optimal joint channel estimation and data detection for COFDM systems - Joint channel estimation and maximum likelihood decoding method for Coded Orthogonal Frequency Division Multiplexing (COFDM) systems are presented. Using this method in conjunction with convolutional coding, robust and nearly optimal coherent detection can be achieved in rapid dispersive fading channels. Significant performance gain in packet data throughput is realized in a system with aggressive frequency reuse. A method for estimating channel characteristics in a multicarrier transmission system comprising the steps of receiving a multicarrier signal, applying Fast Fourier transformations to the multicarrier signal, estimating channel characteristics of a multicarrier channel over which the multicarrier signal was transmitted using a combination of iterative processing and iterative backward processing, and decoding the transformed multicarrier signal is presented.03-26-2009
20090080574DIGITAL BROADCASTING SYSTEM AND METHOD OF PROCESSING DATA IN DIGITAL BROADCASTING SYSTEM - A digital broadcast receiver and a control method thereof are disclosed. The control method includes receiving a broadcast signal into which mobile service data and main service data are multiplexed, extracting transmission parameter channel (TPC) signaling information and fast information channel (FIC) signaling information from a data group in the received mobile service data, acquiring control data required to decrypt an encrypted service included in an ensemble by using the extracted FIC signaling information, the ensemble being a virtual channel group of the received mobile service data, and controlling such that the encrypted service is decrypted by using the acquired control data.03-26-2009
20080304599Interface Circuit As Well As Method For Receiving And/Or For Decoding Data Signals - In order to provide an interface circuit (12-11-2008
20090052590LAYERED MODULATION FOR DIGITAL SIGNALS - Signals, systems and methods for transmitting and receiving layered modulation for digital signals are presented. A layered signal for transmitting data, comprises a first signal layer including a first carrier and first signal symbols for a first digital signal transmission and a second signal layer including a second carrier and second signal symbols for a second signal transmission disposed on the first signal layer, wherein the layered signal has the first carrier demodulated and first layer decoded to produce the first signal symbols for a first layer transport, the first signal symbols are remodulated and subtracted from the layered signal to produce the second signal layer, and the second signal layer has the second carrier demodulated and decoded to produce the second signal symbols for a second layer transport.02-26-2009
20090052587DIGITAL BROADCASTING SYSTEM AND METHOD OF PROCESSING DATA IN DIGITAL BROADCASTING SYSTEM - A digital broadcasting system and a data processing method are disclosed. The receiving system of the digital broadcasting system includes a baseband processor, a first handler, a second handler, and a storage unit. The baseband processor receives a broadcast signal including mobile service data and main service data. Herein, the mobile service data may configure an RS frame, and the RS frame may include the mobile service data and first signaling information of a first data type on the mobile service data. The first handler parses the first signaling information received from the RS frame, converts parsed data elements of the first data type to a second data type, and merges multiple identification information of the parsed first data type, thereby generating identification information of the second data type. The second handler receives second signaling information of the second data type on the mobile service data, the second signaling information including at least one fragment, uses the identification information of the second data type included in the first handler to search at least one fragment within the second signaling information, and maps data elements received through the searched fragment with the data elements converted to the second data type.02-26-2009
20110142176RECIEVING APPARATUS AND METHOD, PROGRAM, AND RECIEVING SYSTEM - Disclosed herein is a receiving apparatus for receiving an orthogonal frequency division multiplexing signal, namely, OFDM signal having a frame having one frame length of a plurality of patterns, including: an acquiring section configured to acquire information on a preamble signal from the OFDM signal transmitted from a transmitting apparatus in accordance with an OFDM system; a frame determining section configured to determine whether or not the one frame length is short in the frame based on the information on the preamble signal acquired from the acquiring section; and a time interpolating section configured to obtain transmission path characteristics by comparing a pilot contained in the preamble signal and a known pilot corresponding to the pilot in a phase of transmission with each other when the frame determining section determines that the one frame length is short in the frame, and interpolate a data portion in a time direction based on the transmission path characteristics thus obtained.06-16-2011
20110142175System and method for television signal demodulation and decoding - A modem for use with a computer having a demodulator and a decoder, the modem comprises a hardware interface; a demodulator front-end having a first input and a first output, the first output of the demodulator front-end being configured to interface with the demodulator of the computer and to provide a demodulated front-end signal to the demodulator over the hardware interface; and a forward error correction (FEC) unit having a second input and a second output, the second input of the FEC unit being configured to interface with the demodulator of the computer and to receive a demodulated signal from the demodulator over the hardware interface, the demodulated signal being a demodulation of the demodulated front-end signal, and the second output of the FEC unit being configured to interface with the decoder of the computer and to provide an FEC signal to the decoder over the hardware interface.06-16-2011
20130121446SIGNAL DETECTION DEVICE, METHOD OF CONTROLLING SAME, PROGRAM, AND WIRELESS COMMUNICATION DEVICE - A signal detection device includes: a band limiting filter in which cutoff frequency is changeable; a signal detection unit that detects whether or not a signal of a specific frequency is present, from a received signal; and a control unit that executes a first signal detection that causes the signal detection unit to detect a signal, with a cutoff frequency of the band limiting filter less than the Nyquist frequency of an A/D converter, and a second signal detection that causes the signal detection unit to detect a signal, with a cutoff frequency of the band limiting filter greater than or equal to the Nyquist frequency of the A/D converter.05-16-2013
20110222635High-Speed Communication Channel Techniques with Improved Robustness to Timing Uncertainty - A method and system using the principle of generalized maximum likelihood estimation to resolve sample timing uncertainties that are associated with the decoding of communication signals. By using generalized maximum likelihood estimation, sample timing uncertainty can be resolved by taking multiple samples of the received signal within a symbol period and determining which sample best corresponds to the optimal sample timing. The sample which best corresponds to the optimal sample timing can be determined from a timing index which can be calculated from ambiguity indicators that are based on the samples of the received signal.09-15-2011
20080285687APPARATUS, AND ASSOCIATED METHOD, FOR DETECTING VALUES OF A SPACE-TIME BLOCK CODE USING SELECTIVE DECISION-FEEDBACK DETECTION - A selective decision-feedback detector for the space-time block code which provides both diversity and spatial multiplexing. To detect a received code block of transmitted symbols, the channel matrix is properly preprocessed with the real and imaginary parts decoupled, and the selective decision-feedback detector makes multiple decisions on the same block upon differently permuted channel matrix and generates multiple candidates for the results. The indicators of the decision errors associated with the candidates are compared, and one of the candidates with the minimum error is selected by a selector as the decided symbols to be used for further processing at a receiving station.11-20-2008
20110222636METHOD AND RECEIVER FOR ESTIMATING THE CHANNEL IMPULSE RESPONSE USING A CONSTANT MODULUS INTERFERENCE REMOVAL ITERATION - A receiver and associated method estimates a channel impulse response of the communications signal. A communications signal is received as a burst of transmitted symbols, including a known training sequence. The joint estimation of timing offset and initial channel impulse response is determined based on the cross-correlations of the known transmitted symbols and received communications signal. A constant modulus interference removal iteration is applied to improve the initial channel impulse estimation.09-15-2011
20090245431ZEROING-OUT LLRS USING DEMOD-BITMAP TO IMPROVE PERFORMANCE OF MODEM DECODER - A demodulation mask bitmap includes binary mask values. Each mask value corresponds to an input resource element to a demodulator. For each mask value of a first state, a demodulation engine of the demodulator is not clocked and the demodulator outputs a zero-valued resource element. For each mask value of a second state, the demodulation engine is clocked, the input resource element is demodulated, and the demodulator outputs a demodulated resource element. A demodulation mask bitmap is designed to mask pilot resource elements and corrupted resource elements. Power is conserved by not clocking the demodulation engine for corrupted and pilot resource elements. Subsequent LLR generation and decode operations are simplified. Decoder performance is improved because the decoder does not decode LLR values derived from corrupted resource elements and/or resource elements not relevant to the reconstruction of a communicated message.10-01-2009
20090220032Multi-Stage Combining Weight Calculation Method and Apparatus - Combining weights are calculated in multiple stages based on an overall system impairment covariance matrix and a grouping of signal processing delays. Computing the combining weights in multiple stages avoids having to invert the entire system impairment covariance matrix. Instead, smaller matrix inversions are performed. In one embodiment, a received signal is processed by calculating an impairment covariance matrix for a set of processing delays used to derive a plurality of signal values from the received signal. A set of intermediate combining weights is calculated for each of at least two different subsets of the processing delays based on the impairment covariance matrix. The signal values derived across the subsets of processing delays are combined using the sets of intermediate combining weights and the impairment covariance matrix.09-03-2009
20090245430EFFICIENT PARALLEL SUB-PACKET DECODING USING MULTIPLE DECODERS - A configurable decoder within a receiver (for example, within a wireless communication device) includes numerous decoders. In one mode, the multiple decoders are used to decode different sub-packets of a packet. When one decoder completes decoding the last sub-packet assigned to it of the packet, then that decoder generates a packet done indication. A control circuit receives the packet done indications, and when all the decoders have generated packet done indications then the control circuit initiates an action. In one example, the action is the interrupting of a processor. The processor responds by reading status information from the control circuit, thereby resetting the interrupt. End-of-packet markers are usable to generate packet done indications and to generate EOP interrupts. Similarly, end-of-group markers are usable to generate group done indications and to generate EOG interrupts. The decoder block is configurable to process sub-packets of a packet using either one or multiple decoders.10-01-2009
20090245429SAMPLE RATE CONVERTER AND RECEIVER USING THE SAME - A sample rate converter includes a multiplexer which multiplexes input signals, an interpolator which interpolates a multiplexed output signal to generate a first feedback signal, a multiplier which multiplies the first feedback signal by a coefficient, a subtracter which subtracts the multiplied signal from the multiplexed input signal, an adder which adds the residual signal and a second feedback signal to sequentially generate integrated signals corresponding to the input signals, respectively, a register circuit configured to individually hold integrated signals, a multiplexer which multiplexes the integrated signals from the register circuit to generate the second feedback signal, a multiplexer which multiplexes the integrated signals from the register circuit to generate a decimation target signal, a decimator which subjects the decimation target signal to decimation to generate the multiplexed output signal, and a discrimination circuit configured to discriminate the multiplexed output signal to generate output signals.10-01-2009
20080260073Ecoding and decoding methods and apparatus for use in a wireless communication system - The claimed subject matter relates to encoding and decoding information in a wireless communication system using soft-demodulation and interleaving of concatenated code received in a strip channel. A set of symbols is received containing a plurality of information bits, dividing the received set of symbols into a plurality of subsets of symbols, each subset corresponding to the input of an inner code demodulation selecting a set of initial a priori values of the inner code demodulation for each subset of symbols, and demodulating each subset of symbols, using the initial a priori values of the subset of symbols and an inner code generator matrix, to generate a plurality of first soft information values as the output of the inner code demodulation. Each of the first soft information values is associated to one of the plurality of information bits using an outer code generator matrix, calculating a plurality of second soft information values as the output of the outer code demodulation, wherein each second soft information value corresponds to one of the information bits and is calculated using at least two of the first soft information values associated with the information bit, determining a new set of a priori values of the inner code demodulation for each subset of symbols, using the second soft information values and the outer code generator matrix, and replacing the initial a priori values with the new a priori values, and repeating the demodulating, associating, calculating and determining actions at least once.10-23-2008
20080260074Symbol Analyzing Device, Symbol Analyzing Method, and Information Storage Medium - To provide a symbol analyzing device capable of carrying out post hoc analysis of the meaning of a symbol used in communications. The symbol analyzing device comprises a symbol acquiring section (10-23-2008
20090252259RECEIVING DEVICE AND RECEIVING METHOD - A receiving device that receives as a received signal R10-08-2009
20090257531SAMPLING FILTER APPARATUS AND WIRELESS COMMUNICATION APPARATUS - The present invention has an object to provide a sampling filter apparatus and a wireless communication apparatus, which are capable of changing a filter characteristic without employing complex waveforms as control signals, and also, capable of performing filtering process operations without performing a decimation, while utilizing a wide frequency space. A sampling filter apparatus 10-15-2009
20100150278RECEIVER FOR HIGH-SPEED WIRELESS COMMUNICATION SYSTEM AND CONTROL METHOD THEREOF - An apparatus for reducing power consumption of a receiver in a high-speed wireless communication system and a control method thereof are provided. The apparatus for processing a signal in a receiver of a wireless communication system includes a carrier sensor configured to sense a carrier used in the wireless communication system, a decoder configured to decode the detected carrier signal to a signal and data, and a controller configured to control supplying power and a clock only to the carrier sensor during carrier sensing, and supplying power and a clock to an overall receiver when a carrier is sensed.06-17-2010
20120195397CHANNEL ESTIMATOR WITH HIGH NOISE SUPPRESSION AND LOW INTERPOLATION ERROR FOR OFDM SYSTEMS - A receiver with DFT based channel estimation having good noise suppression for both high and low signal-to-noise ratios providing advantages over conventional DFT estimators and Minimum-Mean-Square-Error (MMSE) estimators. The use of MMSE may be incorporated for estimation at the band edges providing further improvements. The received signal in the time domain, is transformed to the frequency-domain received signal via an N-point FFT (08-02-2012
20090316837SAMPLE REARRANGEMENT FOR A COMMUNICATION SYSTEM WITH CYCLIC EXTENSION - Signal detectivity is improved by implementation of address adjustment to reorder samples and to discard undesired samples. Such reordering is utilized when the time order of received samples are distorted and/or corrupted, which can occur in at least three situations. If the samples are distorted in time order, the samples are rearranged to allow the samples to return to proper order. The samples, if corrupted, are discarded and replaced with zero samples.12-24-2009
20090316839Apparatus and method for adaptively correcting I/Q imbalance - An apparatus and method for adaptively correcting I/Q imbalance, which is used in a receiver for correcting a received I/Q imbalanced signal to thus eliminate the I/Q imbalance. First, an interference amount caused by interference from an imbalanced in-phase signal to an imbalanced quadrature-phase signal is computed and accordingly subtracted from the quadrature-phase signal, so that a corrected quadrature-phase signal without phase imbalance is obtained. Next, a power of output in-phase signal, a power of output quadrature-phase signal, and a target are compared to thus determine an in-phase scaling factor and a quadrature-phase scaling factor. Finally, the imbalanced in-phase signal is multiplied by the in-phase scaling factor to thus obtain the output in-phase signal, and the corrected quadrature-phase signal is multiplied by the quadrature-phase scaling factor to thus obtain the output quadrature-phase signal.12-24-2009
20100150275Systems and Methods for Digitizing Multiple Channels in a Receiver - Systems and methods for mitigating multipath signals in a receiver are provided. In this regard, a representative system, among others, includes a radio frequency (RF) front-end and at least one analog-to-digital converter (ADC). The RF front-end receives FM signals and down-converts the received frequency signals to intermediate frequency (IF) signals. The analog-to-digital converter (ADC) receives the intermediate frequency signals and digitizes multiple FM channels around a desired FM channel associated with the down-converted signals. The system further includes multiple sets of digital processing components that are configured to simultaneously receive and process the digitized multiple channels. The multiple sets of digital processing components include at least two parallel channel selection and demodulation paths in which the respective digitized multiple channels are processed therethrough.06-17-2010
20100150277METHOD FOR DETECTING RANDOM ACCESS SIGNAL - Provided is a method for detecting random access signal, and the method includes detecting a peak position of a random access signal in a first preamble section and ignoring the random access signal apart from the peak position for less than a certain distance in a second preamble section adjacent to the first preamble section.06-17-2010
20100189198Universal Systems and Methods for Determining an Incoming Carrier Frequency and Decoding an Incoming Signal - Consumer infrared (CIR) systems typically are used in remote control systems. Most CIR systems expect a known carrier frequency and encoding scheme. However, there are many applications of a universal CIR receiver which can receive and decode CIR signals regardless of the carrier frequency or encoding scheme. A CIR receiver circuit is disclosed which can both decompose a received CIR signal into run length representation and detect the carrier frequency. The result can then be supplied to a host device for further processing, interpretation and/or actions.07-29-2010
20090103658DIGITAL BROADCAST TRANSMISSION AND RECEIVING SYSTEM HAVING AN IMPROVED RECEIVING PERFORMANCE AND SIGNAL PROCESSING METHOD THEREOF - A digital broadcast transmitter comprising: a randomizer to receive a data stream of which stuff bytes are inserted into a specified position and to randomize the received data stream; a stuff-byte exchange unit to generate known data having a predefined pattern and to insert the known data into the specified position of the data stream into which the stuff bytes are inserted; an encoder to encode the data stream output from the stuff-byte exchange unit for an error correction; and a modulator and RF converter to modulate the encoded data stream, RF-convert the modulated data stream and transmit the RF-converted data.04-23-2009
20100183099Reception Control Method and Wireless Communication Apparatus - When receiving a signal from the antenna #07-22-2010
20100183100RECEIVER AND RECEPTION METHOD - A receiver includes a propagation path estimation unit which produces a channel impulse response estimation value from a received signal, a replica signal creation unit which creates a replica signal as a replica of a transmitted signal based on the received signal, a time period setting unit which sets time periods into which the channel impulse response estimation value is divided, a received signal extraction unit which extracts received signals of the time periods set by the time period setting unit using the replica signal created by the replica signal creation unit, a combining unit which iterates a process for combining the signals of the time periods extracted by the received signal extraction unit, and a demodulation processing unit which performs a demodulation process for the signals combined by the combining unit. The number of time periods set in at least one iterative process is different.07-22-2010
20100183097DIVERSITY RECEIVING APPARATUS AND DIVERSITY RECEIVING METHOD - There is provided a diversity receiving apparatus (07-22-2010
20100183098METHOD AND SYSTEM OF DIFFERENTIAL COMPLEX AND REAL MULTI-CARRIER DEMODULATION - A method and a receiver are provided for demodulating a received multi-carrier modulated signal. The demodulation procedure includes (a) multiplying the received multi-carrier modulated signal with its complex conjugate to obtain a squared signal; (b) multiplying the squared signal with a signal having a frequency07-22-2010
20100189197RADIO RECEIVING DEVICE - A radio receiving apparatus capable of making compensation for both amplitude variations and phase variations and of suppressing image interference in a short period of time is provided.07-29-2010
20090116588WIRELESS COMMUNICATIONS APPARATUS - A lattice reduction device is described for determining a reduced lattice for a MIMO decoder. The device comprises a data processing element operable to receive matrix information and to apply one or more data processing operations on the matrix information. The device further comprises first and second parallel operation means operable in conjunction with the data processing element so that any operation carried out by said data processing element on said matrix information is directly matched by an operation carried out on respective matrix information. The data processing element is operable, on an input triangular matrix being an R component of a QR decomposition of a channel state matrix, to tend non diagonal elements of said triangular matrix towards zero on the basis of matrix column operations and to make corresponding column operations at said first and second parallel operation means. The first parallel operation means is operable on the basis of an initial matrix which is an identity matrix and said second parallel operation means is operable on the basis of an initial matrix which is said channel state matrix.05-07-2009
20090116587METHOD, SYSTEM AND APPARATUS FOR GENERATING CONSTANT AMPLITUDE ZERO AUTOCORRELATION SEQUENCES - A method, system and apparatus for generating a constant amplitude zero autocorrelation (CAZAC) sequence to be transmitted on a wireless communication channel between a user equipment and a base station within a cellular communication network includes iteratively calculating elements of the CAZAC sequence according to a CAZAC sequence formula until a number of iterations has reached a predetermined iteration value determined in accordance with a number of subcarriers associated with the channel; obtaining a value of particular elements of the CAZAC sequence from a table of stored values at predetermined reset iteration values in order to limit error propagation; and generating the reference signal based upon the elements of the CAZAC sequence. The CAZAC sequence formula is one of a Chu sequence, Frank-Zadoff sequence, Zadoff-Chu (ZC) sequence, and Generalized Chirp-Like (GCL) Sequence.05-07-2009
20100177854TIME INFORMATION RECEIVER, RADIO WAVE TIMEPIECE AND STORAGE MEDIUM HAVING PROGRAM STORED THEREIN - A time information receiver including a reception unit for receiving and demodulating a standard radio wave containing a time code in which data pulses are arranged at a predetermined period; an analyzer for analyzing the time code from a demodulated signal obtained by demodulating the standard radio wave; a time-shift adder for executing an addition processing of adding a pulse waveform of the demodulated signal and a pulse waveform of a signal obtained by shifting the demodulated signal by a predetermined time; and a judger for judging a code type of the time code contained in the received standard radio wave on the basis of a addition result of the time-shift adder.07-15-2010
20100177853TIME INFORMATION RECEIVER, RADIO WAVE TIMEPIECE AND STORAGE MEDIUM HAVING PROGRAM STORED THEREIN - A time information receiver including a reception unit for receiving and demodulating a standard radio wave containing a time code in which data pulses are arranged at a predetermined period; a determining section for determining rising and falling points of a demodulated signal; a first calculator for calculating first differences between respective time intervals of any pair of the rising points and a time period concerned with the predetermined period, and calculating a rising dispersion amount; a second calculator for calculating second differences between respective time intervals of any pair of the falling points and a time period concerned with the predetermined period, and calculating a falling dispersion amount; a comparison section for comparing the rising dispersion amount and the falling dispersion amount; and a judger for judging a code type of the received time code on the basis of a comparison result of the comparison section.07-15-2010
20110110467MULTI-USER MIMO RECEIVER AND METHOD FOR RECEIVING DATA UNITS OVER A WIDEBAND CHANNEL - A multiple-input multiple output (MIMO) receiver includes circuitry to receive a MIMO transmission through a plurality of antennas over a channel comprising two or more 20 MHz portions of bandwidth. The MIMO transmission comprises a plurality of streams, each transmitted over a corresponding spatial channel and configured for reception by multiple user stations. The MIMO receiver also includes circuitry to simultaneously accumulate signal information within at least two or more of the 20 MHz portions of bandwidth. Each 20 MHz portion comprises a plurality of OFDM subcarriers. The MIMO receiver also includes circuitry to demodulate at least one of the steams using receive beamforming techniques. In this way, multi-user protocol data units can be received.05-12-2011
20110235755MIMO RADIO SYSTEM WITH ANTENNA SIGNAL COMBINER - Systems and methods for a MIMO radio with antenna signal combiners are presented. In one embodiment, a (MIMO) radio system for use in a multi-path environment is described. The system includes a plurality of antenna subsystems, each subsystem comprising two or more antennas and a combiner configured to combine signals received via the two or more antennas in a ratio. The system further includes a radio for each of the plurality of antenna subsystems configured to demodulate the combined signal and a MIMO processor configured to produce a single data stream from the demodulated signals.09-29-2011
20100215130Method and Related Device for Detecting Signals in a TMDS Transmission System - A method for detecting signals in a TMDS transmission system is disclosed. A channel of the TMDS system is established between a receiver and a transmitter. The method includes separating loadings of the receiver from the channel, providing a first reference current in a first differential line of the channel, providing a second reference current in a second differential line of the channel, computing a difference between the first reference current and a current provided by the transmitter via the first differential line to obtain a first current difference, computing a difference between the second reference current and a current provided by the transmitter via the second differential line to obtain a second current difference, and determining an operating state of the transmitter according to the first current difference and the second current difference.08-26-2010
20100177852METHODS AND SYSTEMS FOR TIME TRACKING IN OFDM SYSTEMS - Techniques proposed in the present disclosure may used to update an FFT window position and perform linear phase compensation for OFDM wireless systems with up to two antennas at the receiver. Techniques presented herein may help resolve a problem of determining an optimum FFT window position under the condition that the length of channel impulse response is larger than the length of cyclic prefix.07-15-2010
20110103524SIGNAL RECEIVING APPARATUS AND SIGNAL TRANSMITTING SYSTEM - A signal receiving apparatus 05-05-2011
20100239052WIDEBAND DIGITAL RECEIVER WITH INTEGRATED DYNAMIC NARROWBAND CHANNELIZATION AND ANALYSIS - Wideband digital receiver with integrated dynamic narrowband channelization and analysis. Signals received in a wide band are channelized into a plurality of narrower band channels within said wide band and input into a programmable narrowband filter. A set of descriptors is formed, each descriptor corresponding to an associated output signal of each of the channels. The descriptors are analyzed to determine if further processing is warranted. For each descriptor warranting further processing, one or more corresponding analysis algorithms is/are selected from a library of available analysis algorithm and, based at least in part on the selected algorithms, the programmable narrowband filter is adjusted and a new descriptor is formed of its output. The initial set of descriptors is augmented with the new descriptor and the new descriptor is analyzed to determine if further processing of received signals is warranted.09-23-2010
20100215131CIRCUIT, USE, AND METHOD FOR CONTROLLING A RECEIVER CIRCUIT - A circuit, use, and method for controlling a receiver circuit is provided, wherein a complex baseband signal is generated from a received signal, a phase difference between a phase of the complex baseband signal and a phase precalculated from previous sampled values is determined, the phase difference is compared with a first threshold, a number is determined by counting the exceedances of the first threshold by the phase difference, a number of the counted exceedances is compared with a second threshold, and the receiver circuit is turned off if the number of counted exceedances exceeds the second threshold within a time period.08-26-2010
20100254494TRANSMITTING/RECEIVING SYSTEM AND METHOD OF PROCESSING BROADCAST SIGNAL IN TRANSMITTING/RECEIVING SYSTEM - A transmitting system, a receiving system, and a method for processing a broadcast signal are disclosed. The receiving system comprises a tuner, a channel equalizer, a turbo decoder, a demultiplexer, a first error correction decoder, a block deinterleaver, and a second error correction decoder. The tuner receives a broadcast signal including a data group. The data group comprises mobile service data, regularly spaced known data sequences, and signaling data. The turbo decoder performs turbo decoding for the signaling data included in the channel equalized broadcast signal in the channel equalizer. The block deinterleaver performs block deinterleaving for the turbo-decoded FIC data in a block unit of TNoG (the number of all data groups assigned to one subframe)×51 bytes.10-07-2010
20100220818DIGITAL BROADCAST RECEPTION DEVICE - A digital broadcast reception device mounted on a mobile body includes a position information detection unit for detecting the position of the digital broadcast reception device, a database holding unit for storing reception quality of the digital broadcast in advance, a switching point calculation unit for obtaining a hierarchy switching point, and output switching unit for performing a hierarchy switching. The digital broadcast reception device acquires the hierarchy switching frequency generated during movement in advance based on reception quality information previously stored in the database holding unit, and controls the hierarchy switching so as to reduce the switching frequency, thereby reducing disconnections of video and audio.09-02-2010
20090041162SEARCHER FOR MULTIPLE ORTHOGONAL CHANNELS WITH KNOWN DATA WCDMA STEP2 SEARCH - A circuit and algorithm are disclosed for a step2 search of a three step search of synchronization channels in a W-CDMA system. A mobile terminal of the CDMA system includes an RF downconverter for receiving I and Q signals. A searcher, responsive to the I and Q signals, includes a first correlator for correlating the I and Q signals with a primary synchronization code on a primary synchronization channel, and a second correlator for correlating I and Q signals with a secondary synchronization code on a secondary synchronization channel. The correlated I and Q signals are added for each of the secondary synchronization codes. An energy calculator and a maximum energy detector use the correlated I and Q signals of both the primary and secondary synchronization channels to detect the most likely scrambling code group of secondary synchronization codes.02-12-2009
20090074112Method For Operating A Software Radio Receiver And Software Radio Receiver - The present invention disclosed a method for operating a software radio receiver. Said method comprises receiving a radio signal, determining a signal quality of said radio signal, selecting a suitable algorithm for a function in the receiver in accordance with said determined signal quality and applying said selected algorithm to the radio signal.03-19-2009
20090074111WIRELESS COMMUNICATION METHOD AND APPARATUS FOR PERFORMING POST-DETECTION CONSTELLATION CORRECTION - A method and apparatus for correcting the phase and gain of data associated with a constellation pattern of a plurality of received individual symbols. Each symbol is divided into real and imaginary symbol components. The signs of the real and imaginary symbol components of each symbol are determined and used as a basis for determining whether the symbol is associated with a first or third quadrant of the constellation pattern or a second or fourth quadrant of the constellation pattern. The absolute values of the real and imaginary symbol components are determined and used to create a first sum and a second sum. A phase adjustment value θ and a gain adjustment value G are derived from the first and second sums, and are used to create a complex number. Each of the received individual symbols is multiplied by the created complex number to provide corrected constellation pattern data.03-19-2009
20110033012CHANNEL ESTIMATOR - A channel estimator includes: a delay time estimation section configured to estimate a delay time of a received signal; an FFT parameter determination section configured to determine an FFT window position and an FFT size according to the estimated delay time; a first and a second FFT sections configured to transform the received signal and a known pattern signal, respectively, to the frequency domain based on the FFT window position and the FFT size that are determined; a channel response calculation section configured to perform division processing to divide the output of the first FFT section by the output of the second FFT section; and an IFFT section configured to apply IFFT to the output of the channel response calculation section based on the determined FFT size, and the delay time estimation section estimates a delay time based on the output of the IFFT section.02-10-2011
20090110123METHOD AND APPARATUS FOR TRANSMITTING HIGH SPEED DATA BY SPECTRAL DECOMPOSITION OF THE SIGNALING SPACE - A method and apparatus of high speed multi-dimensional signaling via a modem has a processing method of utilizing prolate pulses to optimize the transmission capacity of the channel. The modem includes a process that segments the channel bandwidth and allocates the power and bit loading in relation to a measure of the noise in each spectral bin. Data are carried over a plurality of frequencies across the channel, and within each spectral bin, a plurality of orthogonal signaling dimensions.04-30-2009
20090110122APPARATUS AND METHOD FOR CONTROLLING ITERATIVE DECODING IN A MOBILE COMMUNICATION SYSTEM - An apparatus and a method for raising a data throughput by dynamically changing the maximum number of iterative decoding times of an iteratively decodable code in a mobile communication system are provided. The apparatus includes an early stop controller for determining whether an early stop condition is satisfied during a decoding process according to a maximum number of the iterative decoding times, a Connection IDentifier (CID) controller for detecting a CID of a Media Access Control (MAC) header after the early stop, and an iteration controller for, when determining that a Protocol Data Unit (PDU) is allocated to the receiver apparatus by detecting the CID of the MAC header, resetting the maximum number of iterative decoding times after identifying a decoding block of a next PDU, and for, when the CID is not detected, resetting the maximum number of the iterative decoding times after identifying a next decoding block of the current PDU.04-30-2009
20080304601METHOD AND APPARATUS FOR PROCESSING SATELLITE POSITIONING SYSTEM SIGNALS TO OBTAIN TIME INFORMATION - A method and apparatus for processing satellite positioning system signals at a mobile receiver is described. In one example, first bit-transitions within satellite navigation data transmitted by at least one satellite are estimated at the mobile receiver. A bit pattern is generated that includes a known preamble and an extended preamble. The extended preamble includes expected data bits within the satellite navigation data. The first bit-transitions are compared with second bit-transitions of the bit pattern to generate match data.12-11-2008
20080292028Method and Apparatus for Signal Processing and Encoding and Decoding Method, and Apparatus Therefor - There are disclosed a signal processing method and apparatus according to the present invention. The method includes the steps of acquiring pattern information corresponding to a pattern formed by a plurality of data, and pattern residual information generated in response to the pattern information, and acquiring the data based on the pattern information and the pattern residual information. Accordingly, efficient data coding is possible.11-27-2008
20110129041RECEIVER DEVICE, COMMUNICATION SYSTEM AND RECEIVING METHOD - A receiver device receives a signal inputted to one or a plurality of ports as a plurality of received signals, and includes: a phase offset estimating unit that, on the basis of a unique word of each signal block contained in said received signal, estimates the phase offset, and a phase offset compensating unit that, on the basis of a phase offset estimated by said phase offset estimating unit, compensates the phase offset; the receiver device uses a known signal component (unique word) contained in a frequency-domain equalized signal to compensate the phase offset, whereby it compensates complex phase offset fluctuation, and estimates the phase offset of a signal obtained at each port.06-02-2011
20090052586PULSE RECEIVING CIRCUIT, PULSE RECEIVING METHOD AND PULSE WIRELESS COMMUNICATION DEVICE - A pulse receiving circuit which receives a receiving signal from the outside includes: a template pulse generating circuit which generates a first pulse signal and a second pulse signal having phase different from that of the first pulse signal based on a pulse position timing signal; a first multiplying circuit which multiplies the receiving signal by the first pulse signal and outputs a first multiplication signal; a second multiplying circuit which multiplies the receiving signal by the second pulse signal and outputs a second multiplication signal; a first low band pass filtering circuit which extracts low frequency component from frequency components of the first multiplication signal and outputs a first low frequency signal; a second low band pass filtering circuit which extracts low frequency component from frequency components of the second multiplication signal and outputs a second low frequency signal; and an envelope detection circuit which performs envelope calculation by using the first low frequency signal and the second low frequency signal and outputs a detection signal.02-26-2009
20100310018MULTI-CHANNEL RECEIVER DEVICE - A device processes signals from a plurality of signal channels that are received in parallel. A channel processing circuit (12-09-2010
20100310017RECEIVER AND METHOD OF RECEIVING - A receiver is arranged to detect and recover data from Orthogonal Frequency Division Multiplexed (OFDM) symbols, which are transmitted as first and second versions to form a multiple input multiple output (MISO) system and which carry pairs of data symbols encoded to form Alamouti cells. The receiver includes a channel estimator and corrector, which is arranged to form an estimate of the data symbols, by generating an estimate of first and second channels via which the first and second versions of the OFDM symbols are received. The receiver includes a channel estimator and corrector comprising a pilot data extractor which is arranged to extract the pilot data from the OFDM symbols, a frequency dimension interpolator which is arranged to interpolate between the pilot data received from each of the OFDM symbols in the frequency domain to form sum pilot data and difference pilot data, a sum and difference decoder arranged to combine the sum and difference pilot data to form for each data symbol of the Alamouti pairs an estimate of a sample of the first channel and an estimate of the sample of the second channel, and an Alamouti decoder. The Alamouti decoder is arranged to receive the data bearing sub-carriers from the OFDM symbols and to estimate the data symbols by performing Alamouti decoding using the estimates of the samples for the first and second channels. As such a receiver for a MISO communication system is arranged to recover an estimate of the data symbols, which have been Alamouti-type encoded using frequency dimension interpolation only.12-09-2010
20100310016RECEIVER AND METHOD - A receiver for receiving a sequence of OFDM symbols transmitted via a channel. Each OFDM symbol comprises a plurality of data bearing sub-carriers on which data is transmitted and a plurality of pilot bearing sub-carriers on which pilot data. The pilot sub-carriers are distributed throughout the OFDM symbols of the sequence in accordance with a pilot sub-carrier pattern. The receiver includes a channel estimator, and the channel estimator includes a pilot data extractor for extracting pilot data from the pilot sub-carriers of each OFDM symbol; a pilot data extrapolator for generating extrapolated pilot data based on pilot data extracted from the pilot data sub-carriers; and a pilot data interpolator operable to process the pilot data by interpolating between the extrapolated pilot data in time and frequency to produce an estimate of the channel. The receiver also comprises a discontinuity detector for detecting a discontinuity in the pilot data processed by the channel estimator, and a controller, which upon detection of a pilot data discontinuity by the discontinuity detector, is operable to provide a control signal to the channel estimator which causes at least one of the pilot data extractor, the pilot data extrapolator and the pilot data interpolator to compensate for the pilot data discontinuity in the pilot data.12-09-2010
20130136211RF Front-End for Intra-Band Carrier Aggregation - The method and apparatus described herein address problems associated with conventional wireless receivers configured for intra-band carrier aggregation. The disclosed solution applies the received signal to a single front-end amplifier, which may comprise a low-noise amplifier, and divides the amplified signal into two or more processing paths, where each path is associated with a different local oscillator frequency corresponding to a different reception band. To compensate for the impact of the additional processing paths on the amplifier performance, a negative resistor unit applies a negative resistance to the output of the front-end amplifier when two or more processing paths are active.05-30-2013
20090052585DIGITAL BROADCASTING SYSTEM AND DATA PROCESSING METHOD - A digital broadcasting system and a method of processing data are disclosed, which are robust to error when mobile service data are transmitted. To this end, additional encoding is performed for the mobile service data, whereby it is possible to strongly cope with fast channel change while giving robustness to the mobile service data.02-26-2009
20100310015TRANSMITTING/RECEIVING SYSTEM AND METHOD OF PROCESSING BROADCAST SIGNAL IN TRANSMITTING/RECEIVING SYSTEM - A receiving system and a method of processing broadcast signals in the receiving system are disclosed. The receiving system includes a tuner, a known sequence detector, a carrier recovery unit, and a channel equalizer. The tuner receives a broadcast signal including a data group. Herein, the data group comprises mobile service data, a plurality of known data sequences, and signaling data. One of the plurality of known data sequences comprises a first M symbol sequence and a second M symbol sequence each having a first data pattern. The known sequence detector estimates an initial frequency offset and detects position information of each known data sequence based on the known data sequence having the first data pattern. The carrier recovery unit acquires initial frequency synchronization and performs carrier recovery from the broadcast signal based on the initial frequency offset estimated by the known sequence detector. The channel equalizer performs channel equalization on the broadcast signal based upon the position information of each known data sequence.12-09-2010
20100303175METHOD TO DISCRIMINATE A REAL ECHO PEAK FROM AN ALIASED ECHO PEAK - A method to discriminate a real echo peak from an aliased echo peak comprises: computing ‘a correlation between N samples of a digital data and a copy of the same N samples delayed by a time delay Δ12-02-2010
20100322352SPHERE DETECTOR PERFORMING DEPTH-FIRST SEARCH UNTIL TERMINATED - Systems and methods detect a communication received at receiving antennas from transmitting antennas. Each transmitting antenna transmits a symbol in a constellation. A sphere detector performs a depth-first search until the depth-first search terminates in response to a terminate signal requesting the result from the sphere detector. The depth-first search evaluates respective distances of one or mode leaf nodes in response to the communication received at the receiving antennas. The depth-first search selects the result from these nodes in response to the respective distances. The result includes a selected leaf node that identifies a corresponding symbol in the constellation for each transmitting antenna, with this symbol detected as transmitted by the transmitting antenna.12-23-2010
20100322355METHODS AND APPARATUS FOR SIGNALING OFFSETS AND CHANGES IN DIGITAL BROADCAST NETWORKS - Systems and methods are provided for receivers of digital broadband broadcast signals to determine a time of delivery and a version of a particular signaling table. The receiver is able to determine whether an update of the signaling table is needed based on factors such as whether the update applies (e.g., a DVB-H specific change for a mobile terminal in a DVB-H network). The receiver may power down while awaiting delivery of the signaling table (or utilize the radio for other purposes), powering back up in time to receive the signaling table.12-23-2010
20100322356Method and System for Delay Matching in a Rake Receiver for WCDMA Closed Loop Modes - Certain aspects of a method and system for delay matching in a rake receiver for WCDMA closed loop modes are disclosed. Aspects of one method may include selecting a set of channel estimates from a plurality of channel estimates generated for a delay matched branch and/or a non-delay matched branch in a rake receiver. A plurality of weight factors may be generated based on the selected set of channel estimates. In the delay matched branch of the rake receiver, the application of the generated plurality of weight factors may be delayed by a particular time period. A delay associated with a control channel and/or a data channel may be compensated based on the delayed application of the generated plurality of weight factors.12-23-2010
20110170640SAMPLING CIRCUIT AND RECEIVER - Disclosed are a sampling circuit and a receiver with which filter characteristics compatible with the reception of wideband signals can be realized with a high degree of freedom in the setting of the filter characteristics. More specifically, a sampling circuit capable of removing adjacent interfering wave signals while keeping in-band deviation small is disclosed. The sampling circuit (07-14-2011
20090135961System and Method for Scanning Sequential Logic Elements - System and Method for Scanning Sequential Logic Elements A digital system and method for scanning sequential logic elements are disclosed. The digital system may comprise a plurality of sequential logic elements subdivided into power domains, wherein at least one of the power domains is power gated; a scan chain configured for processing a scan data sequence; a scan enable switch configured for controlling a scan mode; and at least one shadow engine, wherein the at least one shadow engine comprises a control circuit. At least some of the power domains may be interconnected to the scan chain with the scan enable switch, and the scan enable switch may control the scan mode by asserting a scan enable signal. The at least one power gated power domain with one or more sequential logic elements to be power gated may be bypassed via the at least one shadow engine.05-28-2009
20110007850METHOD AND APPARATUS FOR DETERMINING RECEIVER BEAM FORMING VECTORS IN MULTI-USER MIMO SYSTEMS - According to one embodiment there is provided a method of determining receiver beam forming vectors for a plurality of receivers in a MIMO system. Each receiver comprises a plurality of receiver antennae. The MIMO system also comprises a plurality of transmitter antennae. The method comprises quantifying the properties of the channels of the MIMO system in a channel property matrix including interference between individual channels and performing Cholesky decomposition of the receiver property matrix row-by-row into a lower triangular matrix with unit elements along its diagonal, a diagonal matrix and the Hermitian transpose of said triangular matrix. Performing the Cholesky decomposition comprises determining, when performing a step of the Cholesky decomposition for a row, a receiver-beam forming vector associated with the row that maximises the component of the diagonal matrix in the row.01-13-2011
20110007851METHOD AND DEVICE FOR MULTIPLE INPUT-MULTIPLE OUTPUT DETECTION - A method and device for detecting a symbol transmitted over a communication channel in a multiple input-multiple output communication system are disclosed. In one aspect, the method includes receiving a symbol transmitted over a communication channel of a multiple input-multiple output communication system. The method may also include searching a subset of possible transmitted symbols, the subset having a predetermined size dependent on properties of the communication channel. The method may also include deciding to which symbol of the subset the received symbol corresponds.01-13-2011
20090067550METHOD AND SYSTEM FOR REDUNDANCY-BASED DECODING OF AUDIO CONTENT - Aspects of a method and system for redundancy-based decoding of audio content are provided. A redundancy parameter may be generated for verifying a decoded bit sequence that comprises audio content, such as a decoded audio frame. The redundancy parameter may be a cyclic redundancy check (CRC) value and/or a length of frame value associated with the decoded audio frame. Information associated with the redundancy parameter may be comprised within a header of the audio frame. For example, a length of frame value, a bitrate value, a sampling rate frequency value, and/or a frame padding value may be comprised within the header of the audio frame. If the verification of the decoded audio frame fails, subsequent decoding of the previously decoded audio frame may be performed by imposing at least one physical constraint that results from the encoding of the audio frame.03-12-2009
20110019777APPARATUS, AND ASSOCIATED METHOD, FOR DETECTING VALUES OF A SPACE-TIME BLOCK CODE USING SELECTIVE DECISION-FEEDBACK DETECTION - A selective decision-feedback detector for the space-time block code which provides both diversity and spatial multiplexing. To detect a received code block of transmitted symbols, the channel matrix is properly preprocessed with the real and imaginary parts decoupled, and the selective decision-feedback detector makes multiple decisions on the same block upon differently permuted channel matrix and generates multiple candidates for the results. The indicators of the decision errors associated with the candidates are compared, and one of the candidates with the minimum error is selected by a selector as the decided symbols to be used for further processing at a receiving station.01-27-2011
20110019775METHOD AND SYSTEMS FOR RECEIVING PLURAL INFORMATIONS FLOWS IN A MIMO SYSTEM - In a communication system, such as a Multiple Input Multiple Output system operating in a spatial multiplexing mode, for use, e.g., in a WLAN or HSPDA device, a plurality of information flows are received via a set of receive antennas by deriving from at least some, and possibly all, of the receive antennas, respective RF signals, and producing from the RF signals thus derived, a plurality of receive signals, each receive signal to be demodulated to recover one of the information flows transmitted. The receive signals are produced as combinations of the RF signals having applied thereto relative RF phase shift weights.01-27-2011
20110019776METHOD AND APPARATUS FOR OBTAINING PORT INDEX INFORMATION - A method and apparatus are described for obtaining port index information. In one scenario, downlink (DL) control information (DCI) is received that includes new data indicator (NDI). The NDI has a value indicating an antenna port for single-port transmission. In response to receiving the DCI, a single-port transmission associated with the indicated antenna port is received. The NDI may be associated with a disabled codeword and the DCI may include a second NDI. The DCI may be received over a physical downlink control channel (PDCCH). The DCI may include a resource block (RB) assignment information field (IF), a hybrid automatic repeat request (HARQ) process identity (ID) IF, a transmit power control (TPC) IF and, for each of a plurality of transport blocks, a modulation and coding scheme (MCS), an NDI and a redundancy version (RV).01-27-2011
20110019780PROCESSING DIGITAL SAMPLES IN A WIRELESS RECEIVER - A system and method for processing digital samples from a signal received via a wireless transmission channel in a wireless communications system. The method comprises: comparing a target signal quality value with an estimated received signal quality value; detecting if the estimated received signal quality value exceeds the target signal quality value for a period; and selecting one of a plurality of processing routines of differing sensitivities for processing the digital samples.01-27-2011
20110019778Estimating Frequency Offset at a Subscriber Station Receiver - A method and system of estimating frequency offset at a subscriber station is disclosed. The method includes the subscriber station receiving a composite signal, in which the composite signal includes multi-carrier signals transmitted from a plurality of base stations. The subscriber station selects a subset of the plurality of base stations. The subscriber station selects at least one pair of multi-carrier symbols of the composite signal, wherein each of the at least one pair of multi-carrier symbols include a plurality of pilot sub-carriers. The subscriber station selects a subset of the plurality of pilot sub-carriers of the at least one pair of multi-carrier symbols based on transmit pilot symbols of the pilot sub-carriers of the multi-carrier signals transmitted by the subset of the plurality of base stations. The frequency offset is estimated based on a conjugate product between received symbols across at least one pair of multi-carrier symbols of each of the pilot sub-carriers of the selected subset of the plurality of pilot sub-carriers.01-27-2011
20110026645SYSTEMS, APPARATUS AND METHODS FOR BROADCAST CHANNEL DECODING - Techniques for reliable channel decoding in a wireless network are provided. In one aspect, a wireless device receives system information over a physical broadcast channel of a downlink transmission. The wireless device decodes the physical broadcast channel of a current radio frame using a plurality of hypotheses until the decoding passes a cyclic redundancy check. Thereafter, the wireless device compares system information from the current radio frame with information obtained from a previous radio frame. The information from the previous radio frame may include one or more network parameters which may be stored in a memory of the wireless device. In some aspects, the comparison may be performed over a plurality of radio frames. Based at least in part on a result of the comparing, the wireless device may selectively reject system information from one or more of the radio frames.02-03-2011
20110026646E8-VSB RECEPTION SYSTEM, APPARATUS FOR GENERATING DATA ATTRIBUTE AND METHOD THEREOF, AND APPARATUS FOR CHANNEL ENCODING AND METHOD THEREOF - An E8-VSB reception system, apparatus for generating data attribute and method thereof, and apparatus for channel encoding and method thereof are disclosed. In the present invention, E8-VSB data resulting from multiplexing a plurality of enhanced data encoded at different coding rates with main data is received. And, the main data and a plurality of the enhanced data are identified to be modulated from the received E8-VSB data. In particular, by generating M/E packet attribute information, enhanced packet attribute information, enhanced byte attribute information and E8-VSB symbol attribute information from the E8-VSB data attribute generating apparatus, the channel decoding apparatus can correctly identify to decode the main data, ½ enhanced data and ¼ enhanced data from one another.02-03-2011
20110026644Method for processing received signal by applying channel status information based on orthogonal frequency division multiplexing - Provided is a method for processing received signal by applying channel status information based on OFDM. The method applies CSI to a soft-decided signal and thus can more enhance performance than a method applied to a typical decoder even without using an additional memory and the increase of a clock speed. The method appropriately perform adjustment suitable for a soft-decided and received signal in applying pre-estimated CSI to a decoder, thereby more enhancing performance and enabling adaptive application based on the change of a channel status. The method includes performing a first operation of calculating a new second Channel Status Information (CSI) value CSI02-03-2011
20090034659PILOT SYMBOL ASSISTED MODULATION SIGNAL PROCESSING SYSTEMS AND METHODS - Pilot symbol assisted modulation (PSAM) techniques for Rayleigh and Rician fading channels are derived. Previous techniques implement PSAM signal detectors as an ad-hoc design, using pilot symbols to first estimate channel gain, and then using channel gain estimates in a conventional coherent detector to make data decisions. Although this structure may be effective for binary phase shift keying in Rayleigh fading, it is suboptimal for Rician fading and for 16-ary quadrature amplitude modulation in Rayleigh fading. According to techniques disclosed herein, a PSAM signal detector jointly processes pilot symbols and data symbols. The performance of signal detectors according to embodiments of the invention is analyzed and compared with that of conventional detectors. Numerical results are presented to show that the performance gain of a proposed new PSAM signal detector over conventional PSAM detectors can be as much as 2 or 3 dB for Rician fading in some cases.02-05-2009
20110038443COMMUNICATION APPARATUS, COMMUNICATION METHOD THEREFOR, PROGRAM, AND STORAGE MEDIUM - When a button for setting a communication parameter is operated in a communication apparatus that has a communication-parameter receiving function (receiving apparatus) and that is currently participating in a network, the communication apparatus (receiving apparatus) sends a start notification message to another apparatus currently participating in the network. Upon receipt of the start notification message, a providing apparatus currently participating in the network starts a communication-parameter providing process.02-17-2011
20110019779RADIO APPARATUS - An RF unit receives multicarrier signals via a plurality of antennas. A division unit divides the multicarrier signals received into a plurality of groups in the frequency domain. The division unit acquires the channel quality for each subcarrier, contained in the multicarrier signal, in the frequency domain, and defines the plurality of groups according to the channel quality. The processing unit performs adaptive array signal processing for each of the divided groups.01-27-2011
20110019773SIGNAL PROCESSING CIRCUIT AND METHOD WITH FREQUENCY UP-AND DOWN-CONVERSION - A signal processing circuit comprises a frequency up-conversion circuit (01-27-2011
20110044410DEVICE AND METHOD FOR ENCODING/DECODING - A method of and an apparatus for encoding/decoding video data are disclosed. Included in the decoding apparatus are: a tool box that stores functional units; a decompression unit that receives a compressed decoder description and decompresses a CDDL-based decoder description; a decoder description analyzing unit that transforms the CDDL-based decoder description to an XML-based decoder description; an ADM generation unit that generates an abstract decoding model (ADM) using the XML-based decoder description; and a decoding solution that loads functional units stored in the tool box and decodes input data to video data by using the ADM or XML-based decoder description. With the present invention, it is possible to reconfigure and reconstruct a decoder in various way using the decoder description.02-24-2011
20110044409COMMUNICATION DEVICE, COMMUNICATION SYSTEM, RECEPTION METHOD, AND PROGRAM - A communication device including: a reception unit which receives signals including an initial transmission signal and signals including retransmission signals for the same data; a signal detection unit which detects at least two signals among the initial transmission signal and the plurality of retransmission signals for the same data from the received signal using the result of a decoding process; a combining unit which combines at least two signals detected by the signal detection unit; and a decoding unit which obtains the result of the decoding process by decoding the combined signal; wherein the detection by the signal detection unit, the combining by the combining unit, and the decoding by the decoding unit are iteratively performed with respect to the plurality of signals for the same data.02-24-2011
20110044407ADAPTIVE QRD-M ALGORITHM BASED SIGNAL DETECTING METHOD BY USING CONSTELLATION SET GROUPING IN SPATIAL MULTIPLEXING MULTIPLE-INPUT MULTIPLE-OUTPUT SYSTEM - There is provided a signal detecting method using constellation set grouping in a spatial multiplexing multiple input multiple output system. The signal detecting method includes dividing a set of candidate symbols, a constellation set into a plurality of subsets by grouping the constellation set; dividing a tree search process of a QR-decomposition with M-algorithm (QRDM) algorithm into a plurality of partial detection phases; and performing the plurality of divided partial detection phases in parallel or iteratively.02-24-2011
20120033765RECEPTION DEVICE, PROGRAM, AND RECEPTION METHOD - A reception device provided with a broadcast reception unit which receives a broadcast at an instructed frequency, reproduces the broadcast, and outputs the result (steps 02-09-2012
20110116580DATA TRANSLATION SYSTEM AND METHOD - A data translation system (05-19-2011
20110116579Method and System for Utilizing Tone Grouping With Givens Rotations to Reduce Overhead Associated With Explicit Feedback Information - Aspects of a method and system for utilizing tone grouping with Givens rotations to reduce overhead associated with explicit feedback information are presented. In one aspect of the invention, Givens matrices may be utilized to reduce a quantity of information communicated in explicit feedback information via an uplink RF channel. The explicit feedback information may include specifications for a feedback beamforming matrix that may be utilized when transmitting signals via a corresponding downlink RF channel. The feedback beamforming matrix may represent a rotated version of an un-rotated matrix. The Givens matrices may be utilized to apply one or more Givens rotations to un-rotated matrix. The rotated matrix may reduce the quantity of information communicated in the explicit feedback information. The quantity of information communicated in the explicit feedback information may be further reduced by utilizing tone grouping.05-19-2011
20110243279DECODING FOR MIMO SYSTEMS - In one aspect there is provided a method. The method may include receiving a signal transmitted through a channel; receiving an estimate of the channel; determining from the estimate of the channel at least one statistic representative of a variability of the estimate of the channel; decoding the received signal by at least searching for an output using a plurality of cost metrics determined based on at least the estimate of the channel and the at least one statistic; and providing, based on at least one of the plurality of cost metrics, the output. Related apparatus, systems, methods, and articles are also described.10-06-2011
20110080979SYSTEM AND METHOD FOR MIMO DECODING - A method, a system, a wireless device and a computer program product are provided. A process for decoding transmitted symbols in MIMO systems is provided. The received point coordinates and estimated candidate coordinates are represented by a reduced bit representation naturally dividing each dimension into uniformly sized bit segments. A bounded region surrounding the received point is defined in the total number of dimensions, the bounded region being a hypercube. For each candidate, an elimination process is carried out including : determining a position of the candidate to be inside or outside the bounded region, eliminating the candidate if it is outside, storing it if it is inside, adding a further bit thereby reducing a size of the bounding region; repeating the elimination process for the candidates stored as potential solutions until a single solution is obtained; determining the transmitted symbols from the single solution found.04-07-2011
20130156138METHOD AND SYSTEM FOR CHANNEL ESTIMATION - The present invention relates to a method and system for channel estimation. First, pilot signals are extracted from a received multi-path signal, in which each pilot signal includes a first pilot and a second pilot. Then, an initially estimated channel frequency-domain response is obtained based on the extracted first pilot. Afterward, a frequency-domain response estimate of each pilot frequency in the second pilot is calculated according to the obtained initially estimated channel frequency-domain response, an actual value of each pilot frequency in the second pilot is obtained based on the extracted second pilot, and a deviation between the frequency-domain response estimate and the actual value of each pilot frequency is calculated. When it is detected that aliasing components exist in the initially estimated channel frequency-domain response, a center of each aliasing component is determined according to the deviation, so as to determine an estimated position of each aliasing component. Finally, the initially estimated channel frequency-domain response is corrected according to the estimated positions of the aliasing components, so as to obtain an accurate channel estimation response.06-20-2013
20120243642APPARATUS FOR DECODING GLOBAL NAVIGATION SATELLITE SYSTEMS NAVIGATION DATA AND ASSOCIATED METHOD - An apparatus for decoding GNSS navigation data to generate at least a target string or subframe includes a demodulator and a processing unit. The demodulator is utilized for demodulating a received signal to generate at least a plurality of strings or subframes having a same string index or subframe index. The processing unit is coupled to the demodulator, and is utilized for determining the target string or subframe according to the plurality of strings or subframes.09-27-2012
20120134448DETECTION APPARATUS, DETECTION METHOD, AND RECEPTION APPARATUS - A detection apparatus detects, from a carrier signal which has been subjected to load modulation in accordance with information to be transmitted, the information. The detection apparatus includes a buffer configured to buffer the received carrier signal which has been subjected to the load modulation, and a detector configured to perform detection on the buffered carrier signal which has been subjected to the load modulation so as to detect the information.05-31-2012
20110211658SYSTEM AND METHOD OF PERFORMING DIGITAL MULTI-CHANNEL AUDIO SIGNAL DECODING - A system and method are disclosed for performing digital multi-channel decoding of a BTSC composite audio signal. Each subsequent stage of the digital multi-channel decoding process is performed at the lowest sampling rate that yields acceptable performance for that stage. Analog-to-digital conversion of the composite audio signal is performed first to generate a composite digital audio signal. After analog-to-digital conversion, all signal processing may be performed in the digital domain. The composite digital audio signal is digitally filtered to frequency compensate for variations caused by previous stages of processing, including IF demodulation. Digital channel demodulation and filtering are performed to isolate single channels of the composite digital audio signal such as SAP, L−R, and L+R channels. SAP and L−R channels are DBX decoded resulting in corresponding decoded signals using a unique combination of digital filters that are an efficient translation of a corresponding combination of analog filters. The decoded L−R channel and the L+R channel are re-matrixed to form left and right stereo signals. Any of the SAP signal, left and right stereo signals, and L+R channel signal may be sample rate converted and output at a standard audio output rate.09-01-2011
20110243278SYSTEM AND METHOD FOR SIGNALING CONTROL INFORMATION IN A MOBILE COMMUNICATION NETWORK - A method of decoding encoded information communicated over a radio channel includes receiving a vector of encoded information transmitted by a wireless terminal. The encoded information includes an encoded representation of unencoded information bits that have been encoded using a first order Reed-Muller code. The method also includes generating a vector of transform values by performing a Hadamard Transform on the received vector and identifying a subset of the transform values based on scheduling information associated with the wireless terminal. Additionally, the method includes selecting, from the subset of transform values, one of the transform values based on a magnitude of the selected transform value and determining an estimate of the unencoded information bits based on a bit sequence associated with the selected transform value. In accordance with another embodiment of the present disclosure, an apparatus is operable to implement this method.10-06-2011
20110085622DTV RECEIVER AND METHOD OF PROCESSING BROADCAST SIGNAL IN DTV RECEIVER - A DTV receiver includes a tuner tuning to a channel to receive a broadcast signal, and a demodulator demodulating the broadcast signal. The receiver further includes a first decoder which decodes main and enhanced data included in the demodulated signal by calculating soft decision values for the enhanced data and hard decision values for the main data. The receiver further includes a second decoder for decoding the main and enhanced data for first forward error correction, and a third decoder for decoding the FEC-decoded enhanced data for second forward error correction.04-14-2011
20110243280RECEIVER AND RECEIVING METHOD - A receiver is provided which is capable of proper demodulation and error correction in various transmission environments. A receiver for receiving a digitally modulated signal includes a demodulator which selects one demodulation scheme from a plurality of predetermined demodulation schemes based on the received signal, and which demodulates the received signal using the selected demodulation scheme to generate a demodulated signal, and a demapper which obtains metric data by making a soft decision on the demodulated signal. The demapper converts the demodulated signal into the metric data according to the selected demodulation scheme.10-06-2011
20100054369FILTER TUNING CIRCUIT FOR WIRELESS COMMUNICATION SYSTEM - A filter tuning circuit for a wireless communication system is provided. A filter tuning circuit includes a comparator and a counter which control a transconvertance value of a differential transconverter to tune a filter.03-04-2010
20110176643APPARATUS AND METHOD FOR RECEIVING LAYERED DATA THROUGH MULTIPLE MULTICAST CHANNEL - Disclosed are an apparatus and a method for receiving layered data transmitted over a multiple multicast channel. The layered data receiving method includes receiving the data including a count number, arranging the received data in an order of reception and storing in a jitter buffer, rearranging the data in an order of the count number and storing in a data buffer.07-21-2011
20110176642Systems and Methods for Low-Complexity MIMO Detection Using Leaf-Node Prediction via Look-up Tables - A method for building a look-up table for a receiver in a multiple-input multiple-output (MIMO) detection system simulates a MIMO detector over many channel realizations, tracks channel metric and parameter values used for each channel realization resulting from such simulating, and stores, in a look-up table, best values of the tracked values used for a particular channel metric.07-21-2011
20110103519Systems and processes for decoding chain reaction codes through inactivation - A method for processing a chain reaction code includes first selecting a source symbol which is associated with an output symbol of degree two or higher (i.e., an output symbol which is itself associated with two or more input symbols), and subsequently deactivating the selected source symbol in an attempt to produce an output symbol of degree one. The inactivation process can be repeated either successively until an output symbol of degree one is identified, and/or whenever the decoding process is unable to locate an output symbol of degree one.05-05-2011
20090028274PHASE-DIGITAL CONVERTER HAVING HIERARCHICAL STRUCTURE - A time to digital converter having a hierarchical structure is provided. The time to digital converter includes: a plurality of delay stages for sequentially delaying a first signal for a specific delay time; a plurality of flip-flops for comparing delay signals of the first signal delayed by the delay stages with a second signal, and generating different outputs before and after a phase difference between the delay signals of the first signal and the second signal becomes smaller than a resolution of the phase detector; a selection signal generator for generating a selection signal for selecting a signal most similar to the second signal among the delay signals of the first signal from the outputs of the flip-flops; and a Multiplexer (MUX) for receiving the delay signals of the first signal and the selection signal, and outputting the signal most similar to the second signal among the delay signals of the first signal.01-29-2009
20110075768Successive Approximation Register (SAR) Analog-To-Digital Converter (ADC) Having Optimized Filter - A system such as a mechanically tuned radio can have a signal path to receive and process an incoming radio frequency (RF) signal and to provide the processed signal to a first analog-to-digital converter (ADC) to convert the processed signal to a digital signal and to digitally demodulate the digital signal to obtain an audio signal, where this first ADC is separate from an auxiliary ADC not part of the signal path.03-31-2011
20110075767METHOD AND APPARATUS FOR DETECTING A PLURALITY OF SYMBOL BLOCKS - Teachings presented herein offer reduced computational complexity for detecting a plurality of symbol blocks, even for symbol blocks that comprise the combination of a relatively large number of symbols. The teachings perform two or more stages of detection assistance to successively reduce the number of candidate combinations of symbols to be considered for a symbol block when detecting the plurality of symbol blocks. In particular, the teachings identify a reduced set of candidate symbol combinations for at least one symbol block in the plurality of symbol blocks, and then jointly detect each of one or more distinct groups of symbols in the symbol block to determine from that reduced set a final reduced set of candidate symbol combinations. Detection of the plurality of symbol blocks limits the candidate combinations of symbols considered for a symbol block to the final reduced set of candidate symbol combinations identified for that symbol block.03-31-2011
20110069790RECEIVER AND METHOD - A receiver detects and recovers data from Orthogonal Frequency Division Multiplexed (OFDM) symbols, which include pilot sub-carriers as well as data bearing sub-carriers. The receiver comprises a channel estimation processor and a channel estimate post processor. The channel estimation processor includes a pilot acquisition unit adapted to generate a sample of the channel transfer function for each pilot sub-carrier in a received OFDM symbol, and a channel estimator which is arranged to generate an estimate of the channel transfer function providing samples of the channel transfer function at each sub-carrier position in the received OFDM symbol from the pilot derived samples provided by the pilot acquisition unit. The channel estimate post processor is arranged to process the estimate of the channel transfer function received from the channel estimation processor to generate a processed version of the channel transfer function. The channel estimate post processor includes a controller, and a plurality of prediction filters. The controller is arranged to filter the estimate of the channel transfer function produced by the channel estimation processor using the plurality of prediction filters to form the processed version of the channel transfer function to effect of reducing noise in the processed version of the channel transfer function with respect to the estimate of the channel transfer function provided by the channel estimation processor.03-24-2011
20120201332Memory-Aided Synchronization In A Receiver - In one embodiment, a method may include storing information from a first frame of an incoming broadcast signal in a memory coupled to a demodulator, decoding a first preamble symbol of the first frame to determine a transmission mode, accessing at least some of the stored information from the memory and decoding at least one second preamble symbol of the first frame from the accessed information to determine pilot pattern information, and receiving data symbols of the first frame and synchronizing the demodulator based on the received data samples and the pilot pattern information.08-09-2012
20110150145Multicode Transmission Using Walsh Hadamard Transform - A symbol sequence contained in a received signal comprising a cyclic convolution of a Walsh code multiplexed signal and a channel impulse response of a multipath channel is detected using Walsh Hadamard domain equalization techniques. The method comprises converting the received signal and the channel impulse response of the multipath channel from the time domain to the WHT domain, and determining the symbol sequence based on equalizing the received signal in the WHT domain using WHT spectra of the channel impulse response to remove inter-symbol interference from the received signal due to cross-correlation between Walsh codes.06-23-2011
20110150144DEVICE AND METHOD FOR DETECTING CYCLIC PREFIX LENGTH - A device for detecting a cyclic prefix length according to the present invention includes: a plurality of cyclic prefix length searchers that receive a received signal from a transmitting apparatus to search different cyclic prefix lengths for the received signal; a normalizer that receives and normalizes a plurality of search results received from each of the plurality of cyclic prefix length searchers and outputs a plurality of normalization values; and a determining unit that determines any of the normalization values as the cyclic prefix length of the received signal.06-23-2011
20110249775DATA RECEIVER CIRCUIT - A data receiver circuit for converting received serial data into parallel data in accordance with a data rate signal and for outputting the converted parallel data, the data receiver circuit includes a clock generator for generating a reference clock based on an input clock, a data latch for latching the received serial data and outputting first latched serial data in accordance with the reference clock, a first data output section for converting the first latched serial data into first parallel data with a first reference clock, in case that the data rate signal indicates a first data rate same as a data rate of the reference clock, and a second data output section for converting the first latched serial data into second parallel data with a second reference clock, in case that the data rate signal indicates a second data rate slower than the data rate of the reference clock.10-13-2011
20100296610DEMODULATION DEVICE - Provided is a demodulation device that can reliably perform demodulation even in a communication environment where a modulation index changes. Upon reception of communication signals of different modulation indexes from other ships, a demodulation device (11-25-2010
20100098193APPARATUS AND METHOD FOR CLASSIFYING MODULATIONS IN MULTIPATH ENVIRONMENTS - A receiver supports a single carrier (SC) form of modulation and a multi-carrier form of modulation such as orthogonal frequency division multiplexing (OFDM). Upon receiving a signal, the receiver determines a maximum fluctuation range (MFR) as a function of at least a fourth-order cumulant of a received signal; and classifies a modulation type of the received signal as a function of the determined maximum fluctuation range. After determining the modulation type of the received signal, the receiver switches to that modulation mode to recover data from the received signal.04-22-2010
20120033766RECEIVER CIRCUIT AND RECEIVER APPARATUS INCLUDING THE SAME - In a receiver circuit, an analog signal processor frequency-converts an input high frequency signal into a baseband signal, and performs low pass filtering at a cutoff frequency below a desired-wave band. An ADC converts an output of the analog signal processor into a digital signal. A digital signal processor compensates an output of the ADC for a signal component in the desired-wave band which has been attenuated by the filtering operation of the analog signal processor.02-09-2012
20100054368METHOD AND SYSTEM TO DETECT PACKETS OF DIFFERENT FORMATS IN A WIRELESS RECEIVER - A method and system for detecting packets of different formats in a receiver is disclosed. The method and system include initializing the receiver to be in a legacy mode; and receiving at least one data symbol by the receiver. The method and system include detecting if there is a high throughput (HT) signal field within a data packet and determining the format of the data packet based upon the detection of a HT signal field.03-04-2010
20100002811SOFT REPETITION CODE COMBINER USING CHANNEL STATE INFORMATION - An embodiment is a method and apparatus to decode a signal using channel information. A channel state estimator generates a tone value representing channel information. A quantizer quantizes the tone value. A combiner combines de-interleaved symbols weighed by the quantized tone value. A comparator compares the combined de-interleaved symbols with a threshold to generate a decoding decision.01-07-2010
20110150146METHODS AND APPARATUS FOR TAIL TERMINATION OF TURBO DECODING - Methods and apparatus for trellis termination of a turbo decoder are disclosed which simplifies the hardware implementation. As a given example, backward state metrics, which is required to be calculated with forward state metric as part of a constitute decoding, are initialized with pre-calculated values based on input bits.06-23-2011
20080247492Signal Receiving Circuit and Signal Input Detection Circuit - In a signal receiving circuit including a plurality of input channels, there are provided N input detection circuits 10-09-2008
20090052588Apparatus and Method for Sensing an Atsc Signal in Low Signal-to-Noise Ratio - A Wireless Regional Area Network (WRAN) receiver comprises a transceiver for communicating with a wireless network over one of a number of channels, and an Advanced Television Systems Committee (ATSC) signal detector for use in forming a supported channel list comprising those ones of the number of channels upon which an ATSC signal was not detected, wherein the ATSC signal detector includes a filter matched to a PN63 sequence of an ATSC signal for filtering a received signal on one of the number of channels for providing a filtered signal for use in determining if the received signal is an ATSC signal. The ATSC signal detector can be a coherent or a non-coherent ATSC signal detector.02-26-2009
20080279312APPARATUS AND METHODS FOR JOINTLY DECODING MESSAGES BASED ON APRIORI KNOWLEDGE OF MODIFIED CODEWORD TRANSMISSION - A method and apparatus for jointly decoding a first and second message is disclosed. The signaling scenario illustrated by FIG. 11-13-2008
20090097595VECTOR DECODING METHOD AND APPARATUS AND COMPUTER PROGRAM - A vector decoding method includes decomposing a code of an initial vector to obtain a sign code and an absolute vector code, decoding the sign code to obtain a sign vector, performing multi-level permutation-based decoding on the absolute vector code to obtain an initial absolute vector, and combining the sign vector and the initial absolute vector to obtain an initial vector, wherein each respective vector ha a plurality of elements. A vector decoding apparatus includes a decomposing unit configured to decompose a vector code to obtain a sign code and an absolute vector, a sign decoding unit configured to decode the sign code to obtain a sign vector, a multi-level permutation-based decoding unit configured to perform multi-level permutation-based decoding on the absolute vector to obtain an initial absolute vector, and a combining unit configured to combine the sign vector and the initial absolute vector to obtain an initial vector.04-16-2009
20110255640RECEIVER, RECEIVING DEVICE, AND METHOD FOR TERRESTRIAL MOBILE MULTIMEDIA BROADCASTING - A receiver for Terrestrial Mobile Multimedia Broadcasting T-MMB, includes a radio frequency demodulation unit, for carrying out radio frequency demodulation for a received signal; a synchronization unit, for identifying the transmission mode and the synchronous position of the signal from the radio frequency demodulation unit; an OFDM demodulation unit, for extracting a phase reference symbol, Fast Information Channel FIC symbols and data symbols from the signal which is from the radio frequency demodulation unit according to the transmission mode and the synchronous position, carrying out OFDM demodulation and decoding for the FIC symbols to obtain FIC information, carrying out OFDM demodulation for the data symbols of the corresponding sub-channel according to the sub-channel indication information; and a demodulation and decoding unit, for carrying out differential demodulation for the data symbols after the OFDM demodulation, carrying out time-domain deinterleaving for the data symbols after differential demodulation according to the indication of the FIC information, and carrying out forward error correction decoding for the data symbols after the time-domain deinterleaving. The invention also discloses a receiving device and a receiving method for T-MMB.10-20-2011
20120201333RECEIVER AND RECEIVING METHOD - Disclosed is a receiver in a communication system provided with one transmitting station or two or more transmitting stations and the receiver for reception from the transmitting stations. For a case where identical signals are sent from the one transmitting station or the two or more transmitting stations, the receiver includes a first demodulator which executes demodulation processing of the signals as a single signal group, a second demodulator which executes demodulation processing of the signals as multiple signal groups, a determination unit which discriminates between the single signal group and the multiple signal groups, and a control unit which controls which one of the first demodulator and the second demodulator is to execute the demodulation processing based on a determination result by the determination unit.08-09-2012
20080205556Selecting Delay Values For a Rake Receiver - Multipath components of transmitted data symbols are received with individual delays and processed by a RAKE unit having a number of fingers. A delay profile is calculated, and delay values for peaks detected therein are determined. A number of peak delay values (PA08-28-2008
20080205555Method and Apparatus for Channel Estimation - A channel estimation method, comprising the steps of: receiving radio signals transmitted through wireless channel; calculating the channel fading coefficients of pilot symbols, which inserted in a time slot allocated to the wireless signals; estimating the channel fading coefficients of each of predefined groups of chips in the time slot step by step, by utilizing the channel fading coefficients of the pilot symbols and the correlation between the pilot symbols and traffic data in the time slot, wherein each group of chips is composed of predefined number of chips.08-28-2008
20110164706RECEPTION APPARATUS AND METHOD, PROGRAM AND RECEPTION SYSTEM - Disclosed herein is a reception apparatus, including: a reception section adapted to receive an OFDM (Orthogonal Frequency Division Multiplexing) signal obtained by modulating a first frame configured so as to include packets of a common packet sequence configured from a packet common to a plurality of streams and a second frame configured so as to include packets of a data packet sequence configured from packets individually unique to the plural streams; an acquisition section adapted to acquire specification information for specifying a combination of a first frame and a second frame obtained by demodulating the received OFDM signal; and a detection section adapted to detect a combination of a packet of the common packet sequence which configures the first frame and a packet of the data packet sequence which configures the second frame, whose combination is specified based on the acquired specification information.07-07-2011
20110019774Wireless communication apparatus and wireless communication method - A wireless communication apparatus includes a wireless processing unit for performing communication by wireless and an application processing unit for executing an application. The wireless processing unit of the wireless communication apparatus detects reception of wireless function update information for updating a function of the wireless processing unit when update information for updating any function of the wireless communication apparatus is received. After that, the wireless processing unit updates the function of the wireless processing unit, if reception of wireless function update information is detected, by performing an update process specified in the wireless function update information without involving the application processing unit.01-27-2011
20100284497WIRELESS COMMUNICATION APPARATUS AND WIRELESS RECEPTION METHOD - A wireless communication apparatus, having a plurality of antennas 11-11-2010
20110135040DEMAPPING DEVICE AND METHOD FOR MODIFIED DUAL CARRIER MODULATION SYSTEM - Disclosed herein is a demapping device and method for a Modified Dual Carrier Modulation (MDCM) system. The demapping device comprises: the received signal processing unit receives an MDCM signal preprocessed by an operation preparation unit, and calculates differences between squares of distances between the received signal and a plurality of constellation points; the index search unit searches for a constellation point closest to the received signal based on the differences between squares of distances between the received signal and each of a plurality of constellation points; and the demapping operation unit searches for constellation points close to the closest constellation point, and sends demapping result data to a decoding device. The demapping result is obtained by demapping based on differences between squares of distances between the closest constellation point and the close constellation points.06-09-2011
20110261907WIRELESS WAKE-UP SYSTEM AND OPERATION METHOD THEREOF - A wireless wake-up system and an operation method thereof are provided to optimize power consumption when wireless data is received. The wireless wake-up system activates a wake-up detection module and then compares a wireless input signal received through an antenna with a pre-stored reference value. If the wireless input signal is equal to the reference value, the wireless wake-up system determines that the input signal is a wake-up signal with a low bit rate, and then generates a wake-up command corresponding to the wake-up signal. Also, the wireless wake-up system activates a selected module kept in an inactive state by sending the wake-up command to the selected module. The activated module may be a microcontroller unit (MCU). When the MCU is activated, the wireless wake-up system may inactivate the wake-up detection module.10-27-2011
20120147998Differential reception system in cellular receiver and method for realizing signal reception thereof - This disclosure provides a differential reception system in a cellular receiver and a method for realizing signal reception thereof, including: filtering a received signal and then transforming the filtered signal into differential signals; and performing amplification and phase discrimination process of differential signals and compensating the phase of either channel differential signal, and synthesizing the processed differential signals and demodulating the synthesized signal. By means of controlling the phases of differential lines, the disclosure improves the receiving sensitivity of a differential reception system and significantly reduces the requirement for layout of the differential lines.06-14-2012
20120147996DEMODULATOR, A METHOD FOR DEMODULATING AN ASK SIGNAL AND AN ON-BOARD UNIT INCLUDING THE DEMODULATOR - A new demodulator with low power consumption and high gain which is suitable for CMOS integration is provided. The demodulator makes use of a MOS configured in a “common-source” status so as to achieve a desirable gain.06-14-2012
20100260293 CLOCK GENERATION IN MRI RECEIVERS - The invention relates to a nuclear magnetic resonance imaging radio frequency receiver, the receiver being adapted to receive analogue signals from at least one radio frequency receiver coil unit (10-14-2010
20080219385METHODS AND SYSTEMS FOR TRANSMISSION OF MULTIPLE MODULATED SIGNALS OVER WIRELESS NETWORKS - Receiver network for receiving a first filtered modulated transmitted signal in a first RF band and a second modulated transmitted signal in a second RF band and for providing received signals to one or more demodulators. A demodulator and baseband filter for demodulating and filtering the first filtered modulated received signal and for providing filtered demodulated baseband signal by a baseband filter mis-matched to the filter of the first filtered modulated transmitted signal and demodulating the second modulated signal providing a demodulated baseband signal and a selector for selecting either the first or the second demodulated baseband signal. A receiver and demodulation system receiving a first TDMA modulated signal having a first bit rate and for receiving a second modulated signal having a second bit rate and for providing the received signals to a one or more demodulators and for providing cross-correlated demodulated in-phase and quadrature-phase baseband signals and demodulating the second bit rate modulated signal and providing a demodulated baseband signal.09-11-2008
20110096874WIDEBAND PERSONAL-RADIO RECORDER - Methods and apparatuses for concurrently recording multiple radio channels. A recorder includes a wideband tuner having a complex mixer for converting a received wideband RF signal to a complex signal that is then digitized. A digital front end module applies a number of complex down-mixers to the digital complex signal to generate the multiple radio channels in the baseband. Each one of the multiple radio channels in the baseband is further filtered, decimated and demodulated. A digital signal processing unit encodes each demodulated channel according to an audio compression format and stores the then encoded audio content to a storage unit. An RBDS decoder parses radio data service information associated with the stored audio content. The radio data service information is stored in a first section of the storage unit while the encoded audio content is stored in a second section of the storage unit.04-28-2011
20100215129Power Reduction in Physical Layer Wireless Communications - Implementations related to power reduction in physical layer wireless communications are disclosed.08-26-2010
20100254493WIRELESS COMMUNICATION RECEIVER HAVING DE-INTERLEVER AND RELATED SIGNAL PROCESSING METHOD THEREOF - A wireless communication receiver includes a first signal processing block, a second signal processing block, and a de-interleaver. The first signal processing block is configured for receiving a wireless communication signal and processing the wireless communication signal to generate a first output. The de-interleaver is coupled between the first signal processing block and the second signal processing block, and includes a plurality of branches implemented for de-interleaving the first output to generate a second output. The de-interleaver starts outputting the second output to the second signal processing block for further signal processing before all buffers included in the branches are full, and informs the second signal processing block of data derived from one or more unfull buffers included in the branches.10-07-2010
20100166117DATA RECEIVING APPARATUS AND METHOD - A data receiving apparatus and method includes a current-voltage conversion block, which receives a current-type transmit signal including data and a clock signal inserted into the data at a different level from the data, and then converts the received signal into at least one first voltage and at least one second voltage having a different level from the first voltage, and a comparison block, which makes a comparison between the first and second voltages, and then outputs the received signal as one of the data and the clock signal based on a result of the comparison. The data receiving apparatus can easily recover a clock signal while exhibiting better characteristics during the recovery of the clock signal because it is insensitive to a variation in reference voltage and a variation in current at the transmitting state of the timing controller, which are caused by a process variation.07-01-2010
20100166118CHANNEL ESTIMATION FOR A WIRELESS COMMUNICATION SYSTEM WITH MULTIPLE PARALLEL DATA STREAMS - To recover multiple data streams transmitted simultaneously, a first channel estimate is derived for a wireless channel based on received pilot symbols. Detection is performed on received data symbols using the first channel estimate to obtain detected symbols for a first data stream. These detected symbols are decoded to obtain a decoded first data stream, which is re-encoded to obtain remodulated symbols. A second channel estimate is derived based on the remodulated symbols. The first and second channel estimates are combined to obtain a third channel estimate having higher quality. Interference due to the first data stream is estimated using the third channel estimate and canceled from the received data symbols. Detection is performed on interference-canceled symbols using the third channel estimate to obtain detected symbols for a second data stream. These detected symbols are further decoded to obtain a decoded second data stream.07-01-2010
20100158160EXTRACTING INFORMATION FROM POSITIONING PILOT CHANNEL SYMBOLS IN FORWARD LINK ONLY SYSTEM - Methods, systems, and apparatus, including computer programs encoded on computer readable storage media, for extracting transmitter identification information from the Positioning Pilot Channel (PPC) of a MediaFLO superframe. One of a wide area differentiator (WID) value and a local area differentiator (LID) value associated with the transmitter is determined based on signaling in a first interlace of a symbol received via the PPC. A time domain channel estimate is computed for the PPC based on signaling in a plurality of interlaces of the symbol and also based on the one of the WID and LID values. The time domain channel estimate is used to obtain a frequency domain channel estimate for a second interlace of the symbol that carries the transmitter identification information, and the frequency domain channel estimate is used to determine the transmitter identification information.06-24-2010
20100158159EDA-BASED DETECTION OF COMMUNICATION SIGNALS - Methods and apparatus for recovering data from communication signals apply estimated distribution algorithms. Estimated probability distributions may be constructed to avoid deterministic values. Non-converging data elements may be resolved by performing selective local searches. Embodiments recover data from space-time-frequency block coded signals.06-24-2010
20100195772OFDM SYMBOL DETECTING METHOD, COMMUNICATION APPARATUS, INTEGRATED CIRCUIT, AND CIRCUIT MODULE - A method of detecting symbols of an OFDM signal constituted by a plurality of carriers transmitted from another communication apparatus, includes selecting first carriers, where a phase difference between the symbols adjacent on a time domain is smaller than a predetermined value, from a plurality of carriers of a received signal, selecting second carriers, each of which has a phase of a predetermined relation of the OFDM signal with respect to another carrier, from the selected first carriers, and determining whether the received signal has the symbols of the OFDM signal transmitted from the another communication apparatus on the basis of the selection results of the first and second carriers.08-05-2010
20110051856WIRELESS TRANSMISSION DEVICE, WIRELESS RECEPTION DEVICE, AND SYMBOL ARRANGING METHOD - A wireless transmission device enabled to improve an error rate performance at a receiver, by acquiring at least one of frequency diversity effect and a time diversity effect while keeping the interference resistance which is acquired by diffusion. In this transmission device, a modulation unit (03-03-2011
20110051855FRAME SYNC DETECTING CIRCUIT AND FSK RECEIVER USING THE SAME - A frame sync detecting circuit and FSK receiver sequentially derive a moving average value (□) from oversample values of a received word pattern, for given symbol periods, and a difference between the moving average value and an average value for the given symbol periods in a given sync word pattern is determined as DC offsets Δf. Subsequently, the DC offset Δf is subtracted from the received word pattern, and correlation processing with respect to the sync word pattern is performed to determine a correlation value (). If the correlation value exceeds a predetermined threshold, it is determined that a sync word candidate has been received, and symbol values of the received word pattern after the DC offset correction are compared with respective symbol values of the sync word pattern. A sync word pattern detection is determined if errors in the symbols are within a given range.03-03-2011
20110051854ERROR DETECTION AND OFFSET CANCELLATION DURING MULTI-WIRE COMMUNICATION - Embodiments of a circuit are described. In this circuit, a receive circuit includes M input nodes that receive a set of M symbols on M links during a time interval, where the set of M symbols are associated with a codeword. Moreover, the receive circuit includes a decoder, coupled to the M input nodes, that determines the codeword in a code space based on the set of M symbols and that decodes the codeword to a corresponding set of N decoded symbols. Additionally, the receive circuit may include a detector that detects an imbalance in a number of instances of a first value in the set of M symbols, and a number of instances of a second value in the set of M symbols, and, if an imbalance is detected, that asserts an error condition.03-03-2011
20110051853SOFT VALUE GENERATION USING SERIAL LOCALIZATION WITH INDECISION - Soft bit values are generated for received symbols transmitted based on a modulation constellation by demodulating the received symbols via a sequence of demodulation stages, each demodulation stage producing a symbol decision based on an effective constellation. Each effective constellation used by a non-final one of the demodulation stages includes subsets of centroids approximating a region of the modulation constellation. Adjacent ones of the subsets have one or more common points so that at least two adjacent subsets overlap. The soft bit values for the symbol decisions are determined based on detection metrics computed during demodulation for the points included in the effective constellation constructed incrementally over the sequence of demodulation stages, the effective constellation produced by the final demodulation stage being devoid of one or more points included in the modulation constellation.03-03-2011
20100142655SYSTEM AND METHOD FOR RADIO SIGNAL RECONSTRUCTION USING SIGNAL PROCESSOR - A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity.06-10-2010
20090175387DECODING SCHEME USING MULTIPLE HYPOTHESES ABOUT TRANSMITTED MESSAGES - A method and apparatus for decoding encoded data bits of a wireless communication transmission are provided. A set of a-priori bit values corresponding to known bit values of the encoded data bits may be generated. Decoding paths that correspond to decoded data bits that are inconsistent with the a-priori bit values may be removed from the possible decoding paths to consider, and decoding the encoded data bits by selecting a decoding path from remaining decoding paths of the possible decoding paths that were not removed. Multiple hypotheses, each corresponding to a different set of a-prior bit values may be evaluated, with the decoded data for a hypothesis selected based on the evaluation output for further processing.07-09-2009
20090175386System and Method for Improved Vector Analysis - A system includes a “found two” module configured to receive an n-bit vector and to generate a “found two” signal indicating whether there are at least two bits of the n-bit vector in a predetermined state. The system also includes a “one's hot” module coupled to the “found two” module. The “one's hot” module is configured to generate, concurrently with the “found two” module, a first one's hot vector (OHV) based on the received n-bit vector. In one embodiment, the system and method indicate whether an input n-bit vector contains at least two high bits.07-09-2009
20100027719Systems and methods for fine alignment of analog and digital signal pathways - Methods and systems for temporally aligning audio samples of a digital portion of a radio broadcast signal with audio samples of an analog portion of the radio broadcast signal are disclosed. The methods and systems comprise the steps of receiving a radio broadcast signal having an analog portion and a digital portion; separating the analog portion of the radio broadcast signal from the digital portion of the radio broadcast signal; producing a first plurality of audio samples representative of the analog portion of the radio broadcast signal; retrieving from a memory a stored first time interval corresponding to an approximate time for data representing a first sample of the digital portion to travel through a digital signal path in a receiver, wherein the digital signal path includes a digital demodulator; measuring a second time for data representing the first sample of the digital portion to travel from an input of the digital signal path to an input of the digital demodulator; generating a delay amount for delaying a second plurality of audio samples relative to the first plurality of audio samples such that the second plurality of audio samples is temporally aligned with the first plurality of audio samples by adding the first time to the second time; producing the second plurality of audio samples representative of the digital portion of the radio broadcast signal; delaying the second plurality of audio samples by the delay amount such that the second plurality of audio samples is temporally aligned to within a predetermined amount with the first plurality of audio samples; and digitally combining the first plurality of audio samples with the second plurality of audio samples to produce a combined audio output.02-04-2010
20110216856SYSTEMS AND METHODS FOR PRE-AVERAGED STAGGERED CONVOLUTION DECIMATING FILTERS - Certain embodiments of the invention may include systems and methods for implementing a multirate digital decimating filter for filtering received symbol data. The method may include sampling the received symbol data at a selected sample rate, pre-averaging the sampled received data to provide two samples per symbol; convolving the pre-averaged samples with decimated finite impulse response (FIR) aperture impulse response coefficients to produce detected output samples, convolving the pre-averaged samples with shifted decimated FIR aperture impulse response coefficients to produce zero-crossing transition samples, and adjusting the sample rate based at least in part on averaging the zero-crossing transition samples.09-08-2011
20110096873METHOD FOR POST DETECTION IMPROVEMENT IN MIMO - A two-stage approach to MIMO detection improves receiver performance in a computationally tractable manner. A whitening joint detector processes a MIMO symbol stream. The whitening joint detector includes a pre-filter operative to suppress a first subset of the received MIMO streams as colored noise. The whitening joint detector further includes a primary joint detector operative to process a second subset of the MIMO streams and to output a preliminary solution obtained by minimizing a whitening joint detection metric. A secondary detector then operates in the vicinity of the primary joint detector preliminary solution. The secondary detector improves the preliminary solution by comparison to a full joint detection metric.04-28-2011
20120307944RECEIVING APPARATUS AND RECEIVING METHOD - A receiving apparatus includes a symbol timing detection unit, a Fourier transform unit, a first symbol timing correction unit, and an interpolation synthesis unit. The symbol timing detection unit is configured to detect a Fourier transform start position from a received transmitting signal of a symbol unit, the Fourier transform unit is configured to perform a Fourier transform using the detected Fourier transform start position. The first symbol timing correction unit is configured to calculate and correct an amount of change between the Fourier transform start position of a reference symbol and the detected Fourier transform start position, and the interpolation synthesis unit is configured to perform an interpolation synthesis of a plurality of delay profiles corresponding to a plurality of symbols including the reference symbol and a symbol in which the amount of change is corrected.12-06-2012
20120307945METHOD AND APPARATUS FOR SINGULAR VALUE DECOMPOSITION OF A CHANNEL MATRIX - A method and apparatus for decomposing a channel matrix in a wireless communication system are disclosed. A channel matrix H is generated for channels between transmit antennas and receive antennas. A Hermitian matrix A=H12-06-2012
20110103525PULSE SIGNAL WAVEFORM ASYMMETRY IDENTIFICATION UTILIZING SYMBOLIC DYNAMICS - A method for identifying asymmetry in a pulse signal is disclosed. An asymmetrical condition is when the time interval of a first input pulse signal having a first value is longer than the time of a second input pulse signal having a second value. Identifying asymmetry includes receiving and detecting the instantaneous signal values of first and second input pulse signals, and associating a unique state symbol with each distinct pair of instantaneous signal values thereby producing a sequence of state symbols. A sequence of state symbols of a first type, a second type, and a third type is identified and associated with a distinct enveloping event pattern. A macroscopic behavioral signature pattern indicating an asymmetrical condition is identified when a first symmetry event symbol of a first kind is followed by a first interval having no identified symmetry event symbol, a second symmetry event symbol of a second kind, and a second interval having no identified symmetry event symbol.05-05-2011
20100128821SIGNAL DEMODULATION METHOD BASED ON DVB-S2 - A satellite broadcasting frame signal demodulation method is disclosed. A demodulation method of a demodulator that demodulates a Digital Video Broadcasting-Satellite—Second Generation (DVB-S2) standard satellite broadcasting frame signal includes: performing symbol synchronization; performing frame synchronization after symbol synchronization; recovering a carrier wave after frame synchronization; and decoding mode code (MODCOD) information to obtain frame configuration information after recovering the carrier wave. This method ensures rapid demodulation and reliable demodulated data.05-27-2010
20090296859AUTOMATIC CORRECTION OF DATA POLARITY ON A DIFFERENTIAL SERIAL BUS - Methods and structure described herein provide for detecting data inversions between electronic devices in communication with one another and automatically correcting those that inversions. An electronic device may be configured with a receiver that is configured for receiving differential serial data from a transmitter of another electronic device. The differential serial data is formatted according to a particular communication protocol associated with the electronic devices. The receiver detects an invalid sequence in the received differential serial data, such as an inverted SAS primitive, and automatically change the receive logic of the receiver such that subsequent received differential serial data is in the proper polarity. The transmitting device does not require notification of the change in receive logic.12-03-2009
20110135039Coding and decoding of 8-VSB digital television signals for mobile/handheld receivers - Modified systems for broadcasting M/H data employ two-dimensional coding of RS Frames that combines transverse RS coding with subsequent byte-error-locating block coding that generates codewords of a prescribed standard length. This prescribed standard length is chosen such that an integral number of codewords of the byte-error-locating block code fits exactly, or substantially so, into the portion of each RS Frame that is encoded in CCC for inclusion within an M/H Group. The byte-error-locating block coding is CRC coding by way of one specific example or is Reed-Solomon (LRS) forward-error-correction (FEC) coding by way of another specific example. M/H receivers are described in which codewords of this byte-error-locating block coding are decoded and used to influence the soft decisions concerning data bits. Then, these soft decisions are processed and used for locating byte errors for the transverse Reed-Solomon (TRS) codes on an individual basis.06-09-2011
20110305302METHOD FOR THE BLIND ESTIMATION OF OFDM SIGNAL PARAMETERS BY ADAPTED FILTERING - The present invention relates to a method for the blind estimation of at least one parameter of an OFDM signal by maximizing an objective function depending on said parameter. The objective function implements a parameterized model of the OFDM modulation and a matched filtering corresponding to that model. The OFDM signal, baseband demodulated and then sampled in an observation window, is the object of the adapted filtering to calculate the objective function.12-15-2011
20110142177APPARATUS AND METHOD FOR COMPENSATING FOR DELAY MISMATCH BETWEEN AMPLITUDE COMPONENT SIGNAL AND PHASE COMPONENT SIGNAL - Provided are an apparatus and method for compensating for a delay mismatch between an amplitude component signal and a phase component signal. The apparatus includes an amplitude path delay obtainer configured to obtain amplitude-delay information on a delay occurring in a propagation path of an amplitude component signal, a phase path delay obtainer configured to obtain phase-delay information on a delay occurring in a propagation path of a phase component signal, a delay controller configured to calculate and output a difference between the obtained amplitude path delay and the obtained phase path delay, and a variable delayer configured to compensate for a delay by changing a delay value on the basis of the delay difference output from the delay controller. Using an asynchronous method, in which a signal obtained before and after a delay is used as the clock signal of a memory device and the clock signal of a register to find the delay, it is possible to reduce the complexity of the constitution and increase power efficiency.06-16-2011
20100054371Noise Variance Estimation In Wireless Communications For Diversity Combining and Log Likelihood Scaling - The present patent application comprises a method and means for demodulating symbols, comprising converting an OFDM symbol from a time domain to a frequency domain, selecting pilot tones, making a soft decision based on received data, and estimating a channel frequency response. In another example, the method and means further comprises selecting guard tones. In another example, the method and means further comprises generating channel estimates for in-band and band-edge pilot tones.03-04-2010
20110044408OFDM RECEPTION - A received OFDM signal is demodulated by sampling the OFDM signal at successive time instants and computing a Fourier transform of the samples for a block of time instants. In addition, a sliding Fourier transform is computed at every new one of the same input samples, to extract a pilot frequency tone. From results of the sliding Fourier transform a frequency error signal is detected. This signal is fed back the in a frequency synchronization feedback loop. The frequency synchronization feedback loop may be used to track the pilot tone by adjusting a phase correction signal and/or to track sample clock frequency variations.02-24-2011
20080292027DRM receiver and demodulation method - A Digitial Radio Mondiale (DRM) receiver and demodulation method includes a programmable downsampler and a programmable N-point Fast Fourier Transform (FFT) to recover and demodulate the OFDM symbols in a received DRM-encoded RF signal. The received signal is digitally sampled at a rate operably integer downsampled to achieve a number N samples in the useful portion of the OFDM symbol for input to an N-point FFT, where N equal to a power of two. The downsampling rate and size (N-points) of the FFT depend on the DRM encoding and transmission parameters, notably the robustness mode and spectrum occupancy. This reduces the processing/computational requirements and the design complexity of the DRM receiver.11-27-2008
20110110466Method and System for a Sliding Window Phase Estimator for Wideband Code Division Multiple Access (WCDMA) Automatic Frequency Correction - Aspects of a method and system for a sliding window phase estimator for wideband code division multiple access (WCDMA) automatic frequency correction are presented. Aspects of the system may include one or more circuits that enable adjustment of a current demodulation frequency for receiving at least one subsequent symbol based on a computed weighted sum of a plurality of computed frequency error values. Each of the plurality of computed frequency error values may be derived from a current symbol, a corresponding previous symbol, and/or a previous frequency error value. The current symbol may include a current received symbol segment and one or more previously received symbol segments.05-12-2011
20120039422SYSTEMS AND METHODS FOR PROVIDING SURFACE MULTIPATH MITIGATION - Multipath mitigation can be performed in a surface environment by various systems and methods. For example, antenna beams from multiple antennas can be used to reduce the impact of multipath on a received signal. Thus, a method can include monitoring for a signal on at least one upper antenna beam of an aircraft. The method can also include monitoring for the signal on at least one lower antenna beam of the aircraft while monitoring on the at least one upper antenna beam. The method can further include processing the signal received by the at least one upper antenna beam and/or the at least one lower antenna beam.02-16-2012
20120039421QUADRATURE IMBALANCE ESTIMATION USING UNBIASED TRAINING SEQUENCES - A system and method are provided for removing quadrature imbalance errors in received data. The method accepts an unbiased training sequence in a quadrature demodulation receiver. An unbiased training sequence has a uniform accumulated power evenly distributed in a complex plane, and includes predetermined reference signals (p) at frequency +f and predetermined mirror signals (p02-16-2012
20120039420WIRELESS COMMUNICATIONS DEVICE WITH MULTIPLE DEMODULATORS AND RELATED METHODS - A wireless communications device may be configured to perform a first demodulation based upon a first sampling rate of a received signal to generate a first demodulated signal and determine therefrom whether a first error value is not greater than a first threshold, and, if so then decode the first demodulated signal. If the first error value is greater than the first threshold, a second demodulation is performed based upon a second sampling rate of the received signal greater than or equal to the first sampling rate to generate a second demodulated signal and determine therefrom whether a second error value is not greater than a second threshold, and, if so, then decode the second demodulated signal. If the second error value is greater than the second threshold, the second demodulation is performed at least one additional time with at least one change thereto.02-16-2012
20120039419X-MIMO SYSTEMS WITH MULTI-TRANSMITTERS AND MULTI-RECEIVERS - A method and apparatus for transmitting and receiving a wireless transmission of a plurality of data streams in a wireless communication system having a plurality of nodes is disclosed. Each node has multiple antennas. The method involves receiving first and second data streams from respective first and second nodes at a receiver node, causing the receiver node to generate a receive filter for decoding each of the received data streams, and causing the receiver node to transmit receive filter information for each of the first and second data streams, the receive filter information facilitating precoding of the first and second data streams for simultaneous transmission within a common frequency band to the receiver node.02-16-2012
20120147997PREAMBLE GENERATING APPARATUS, PREAMBLE GENERATING METHOD, AND COMPUTER READABLE RECORDING MEDIUM STORING PROGRAM - A preamble generating apparatus used for synchronization of a reception apparatus in an orthogonal frequency division multiplexing system and generating a preamble to be added to a beginning of data at a time of communication, receives preamble length identifying information and position specifying information, and generates a plurality of elements constituting a preamble according to a predetermined sequence based on those information. The preamble generating apparatus creates a preamble model, and generates a plurality of preambles by setting the generated elements at positions of elements in element deciding information included in the preamble model, the positions indicating elements in the preamble model which are to be used in data communication. The preamble generating apparatus calculates PAPRs respectively corresponding to the plurality of preambles, and compares the PAPRs of the preambles with one another to decide the preamble corresponding to a minimum PAPR as a preamble to be used in communication.06-14-2012
20120147999RECEIVING DEVICE, RECEIVING METHOD AND PROGRAM - A receiving device includes: a buffer temporarily accumulating receive data received through a network; a data processing means for processing the receive data; a short-time variation value acquisition means for acquiring a short-time variation value indicating variation of accumulated quantity of the receive data sequentially accumulated in the buffer in a first unit time; a long-time variation value acquisition means for acquiring a long-time variation value indicating variation of accumulated quantity in a second unit time; and a clock control means for controlling a clock frequency for performing processing of the receive data by the data processing means in accordance with evaluation results of the acquired long-time variation value. The clock control means stops adjustment of the clock frequency when an error of the network or the receive data is detected, and starts the adjustment again after a given adjustment stop time passes from the detection of the error.06-14-2012
20120148000BICM DECODING IN THE PRESENCE OF CO-CHANNEL INTERFERENCE - Systems and methods are provided for computing soft information for digital information based on a received signal, where the received signal suffers from noise and interference. A receiver that decodes the received signal may estimate channel information, such as the channel gain, associated with the interfering source. The receiver may also obtain modulation information through a backbone network or by decoding control information transmitted by the interfering source. Using the modulation information and the channel information, the receiver may estimate the effect that interference has on the received signal, and may compute soft information (e.g., a log-likelihood ratio) for the digital information.06-14-2012
20080310557Carrier selection for multiple antennas - A method and apparatus is disclosed to process a received single stream communication signal and/or a multiple stream communication. A communications receiver is configured to receive the received communication signal. A communications receiver determines whether the received communication signal includes a single stream communication signal or a multiple stream communication signal. The communications receiver determines whether a received communication signal complies with a known single stream communications standard. The communications receiver determines whether the received communication signal complies with a known multiple stream communications standard. The communications receiver decodes the received communication signal according to the known single stream communications standard upon determining the received communication includes the signal single stream communication signal. The communications receiver decodes the received communication signal according to the known multiple stream communications standard upon determining the received communication includes the multiple stream communication signal.12-18-2008
20090220031METHOD FOR BLIND DEMODULATION AT HIGHER ORDERS OF SEVERAL LINEAR WAVEFORM TRANSMITTERS - Disclosed is a method of blind demodulation of signals arising from one or more transmitters, the signals including a mixture of symbols comprising at least one step of separating the transmitters by using the temporal independence of the symbol trains specific to a transmitter and the mutual independence of the transmitters.09-03-2009
20110090993SIGNAL PROCESSING METHOD AND DATA PROCESSING METHOD AND APPARATUS - The present invention discloses a signal processing method and a data processing method and apparatus. A time-domain to frequency-domain signal processing method includes: pre-processing time-domain data; pre-rotating the pre-processed data by using a rotation factor a·W04-21-2011
20110090992OFDM RECEIVER AND METHOD FOR COMPENSATING FOR I/Q IMBALANCE - An OFDM receiver for compensating for I/Q imbalance is provided. The OFDM receiver includes an I/Q demodulator demodulating a received signal into a baseband in-phase (I) channel signal and a baseband quadrature (Q) channel signal, and an I/Q imbalance compensator compensating for imbalance between the I-channel signal and the Q-channel signal in a time domain. Accordingly, it is possible to solve the I/Q imbalance and suppress degradation in the performance of the OFDM communication device.04-21-2011
20120106679SYSTEMS AND METHODS FOR HANDLING DATA RATE CHANGES WITHIN A PACKET OR FRAME - Systems and methods for handling data rate changes within a packet or frame are described. In an embodiment, a system may include a radio frequency (RF) circuit operable to receive a message having a plurality of segments, including a first segment that is modulated according to a first modulation data rate. The system may also include a demodulator circuit coupled to the RF circuit and operable to demodulate the first segment into a first demodulated segment having a demodulation data rate, wherein the demodulation data rate is greater than the first modulation data rate. The system may further include a de-mapper circuit coupled to the demodulator circuit and operable to convert the first demodulated segment into a first converted segment having the first modulation data rate.05-03-2012
20120002760VARIABLE LENGTH CORRELATOR - A method for processing a signal derived from a radio frequency signal at some rate in a range of allowable data rates according to one embodiment includes downconverting an incoming signal derived from a radio frequency signal to complex near-baseband signals; processing the complex near-baseband signals in two data correlators corresponding to data 0 and data 1; and changing effective lengths of the correlators based on a symbol data rate of the incoming signal. Such methodology may also be implemented as a system using logic for performing the various operations. Additional systems and methods are also presented.01-05-2012
20120002761Wireless Communication Method For Magnetic Field Communication Network and Demodulation Device of Coordinator - Disclosed herein is a wireless communication method for a magnetic field communication network. The wireless communication method is performed by a coordinator on the magnetic field communication network. The wireless communication method includes transmitting a request signal used to request response to each of sensor nodes; selecting any one of response signals received from the sensor nodes; transmitting an acknowledgement signal to a sensor node corresponding to the response signal; selecting any one of response signals transmitted again from sensor nodes which did not receive the acknowledgement signal; and transmitting an acknowledgement signal to a sensor node corresponding to the selected response signal.01-05-2012
20090257530RADIUS ADAPTIVE SPHERE DECODING WITH PROBABILISTIC NOISE CONSTRAINT - Method and apparatus for decoding code words received over a communication channel are disclosed. A radius-adaptive sphere decoding methodology reduces the number of operations in sphere-constrained search. Imposing probabilistic noise constraint on top of sphere constraint, particularly at an early stage, provides a more stringent necessary condition. Hence, many branches that are unlikely to be selected are removed in the early stage of sphere search. The trade-off between computational complexity and performance can be controlled by adjusting the pruning probability.10-15-2009
20120002759DEMODULATION METHOD FOR MIMO SYSTEMS - A method for processing a plurality of data streams from a transmitter, includes: receiving symbols via the plurality of data streams; generating a channel matrix; sorting the channel matrix to provide a sorted channel matrix; performing QR decomposition on the sorted channel matrix and a column-row-swapped-sorted-channel matrix; performing QR equalization on a sorted received symbol vector and a swapped received symbol vector to provide a equalized-sorted vector and a equalized-swapped-sorted vector; processing first and second portions of the equalized-sorted vector and the equalized-swapped-sorted vector via a QR-MLD demodulation scheme to determine soft bits and soft symbols; and rearrange soft bits in the above steps to provide an output vector.01-05-2012
20100111233METHOD AND RECEIVER FOR ESTIMATING THE CHANNEL IMPULSE RESPONSE USING A CONSTANT MODULUS INTERFERENCE REMOVAL ITERATION - A receiver and associated method estimates a channel impulse response of the communications signal. A communications signal is received as a burst of transmitted symbols, including a known training sequence. The joint estimation of timing offset and initial channel impulse response is determined based on the cross-correlations of the known transmitted symbols and received communications signal. A constant modulus interference removal iteration is applied to improve the initial channel impulse estimation.05-06-2010
20120207248Estimation of Sample Clock Frequency Offset Using Error Vector Magnitude - A low complexity system and method for operating a receiver in order to estimate an offset between the actual sample clock rate 1/T08-16-2012
20120207250OFDM RECEPTION DEVICE, OFDM RECEPTION CIRCUIT, OFDM RECEPTION METHOD, AND OFDM RECEPTION PROGRAM - An OFDM reception device receives an OFDM symbol that includes a signal for a useful symbol duration generated based on transmission information and a signal for a guard interval duration generated based on the signal for the useful symbol duration. The OFDM reception device includes a first orthogonal transformation unit configured to perform an orthogonal transformation on the signal for the useful symbol duration, a second orthogonal transformation unit configured to perform an orthogonal transformation on the signal for the guard interval duration, and a decoding unit configured to decode the OFDM symbol in accordance with results of the orthogonal transformation by the first orthogonal transformation unit and results of the orthogonal transformation by the second orthogonal transformation unit.08-16-2012
20120207249INTERFERENCE CANCELLATION WITH A TIME-SLICED ARCHITECTURE - Example embodiments include methods of interference cancellation at NodeB receivers of baseband antenna signals including physical channels. The methods include canceling interference from a received baseband antenna signal by removing a reconstructed baseband signal from the processed received baseband antenna signal. The processed reconstructed baseband signal includes users whose physical data channel signals were successfully decoded. Methods also include removing interference from a received baseband signal to form an interference cancelled baseband signal that will be processed by the receiver. The interference cancelled baseband signal is the received baseband antenna signal minus users' signal interference contributions whose demodulated physical data channel signals have a determined user symbol energy value that exceeds a threshold. Methods further include removing interference from a user's signal to be error corrected. The interference is symbol interference from an earlier successfully decoded user's symbols. The user symbol interference is determined by cross correlations.08-16-2012
20120207247HIGH-SPEED FLASH ANALOG TO DIGITAL CONVERTER - Disclosed is at least one flash analog-to-digital converter embodiment having a linear voltage ladder, a set of comparators each of which is coupled to one or more operational amplifiers by a sampling switch. Each of the sampling switches samples the comparator output, using the parasitic capacitance of the operational amplifier to hold the voltage. The sampling switches may be single transistors. Some embodiments further include, for each comparator, multiple operational amplifiers each of which drives a binary latch via a gating switch. The gating switches operate in sequence to distribute sequential samples to different latches. At least some embodiments of the flash converter further include an automatic gain control (AGC) that has both differential input terminals and differential output terminals. In such embodiments the comparators compare the differential output of the AGC to a differential reference voltage, and may further provide the result as a differential signal.08-16-2012
20120008722SIGNAL PROCESSOR, RECEIVER AND SIGNAL PROCESSING METHOD - A processor (01-12-2012
20120008721COMMUNICATION TERMINAL, METHOD FOR RECEIVING DATA AND COMPUTER PROGRAM PRODUCT - According to one exemplary embodiment, a communication terminal is provided which has a receiver and has a controller which is configured for controlling the receiver in such a manner that the receiver receives a part of first data from a first network communication facility of a first communication network by means of a first communication channel in a first part of a period in which the transmission of the first data by the first network communication facility overlaps the transmission of the second data by the second network communication facility, and that the receiver receives a part of the second data from the second network communication facility by means of a second communication channel during a second part of the period so that the first part of the period and the second part of the period do not overlap and so that the part of the first data which is received in the first part of the period meets a predetermined criterion.01-12-2012
20090316836SINGLE-WIRE, SERIAL, DAISY-CHAIN DIGITAL COMMUNICATION NETWORK AND COMMUNICATION METHOD THEREOF - A digital communication network including several receivers and a communication method for the digital communication network are provided. Each of the receivers includes a first port and a second port. The first port of the first receiver is coupled to the microcontroller. The first port of each of the receivers except the first receiver is coupled to the second port of the previous receiver. Each receiver further includes a chain register. The chain registers of the receivers are mutually connected through the first ports and the second ports, forming a virtual global queue. By utilizing the characteristics of the virtual global queue, the system and the method achieve bi-directional, single-wire, serial communication without the encumbrance of assigning addresses or identification codes to the receivers.12-24-2009
20110038442Apparatus and Method for Measurement of the Reception Time of a Pulse - Apparatus for measurement of the reception time of a pulse in a receiving system, which contains at least one receiving channel with a non-linear transmission response, which receiving channel produces at its output a received signal, having a memory, in which the received signals of reference pulses with a predetermined different amplitude are available as reference signals with respect to a time scale, and having an evaluation device, which is connected to the receiving system and to the memory and compares a received signal with each reference signal with a variant time offset in order to determine that reference signal and that time offset for which the comparison discrepancy is a minimum, and outputs this time offset as the reception time with respect to the time scale.02-17-2011
20080267321EXTENDED ALGORITHM DATA ESTIMATOR - A method of data estimation for a Time Division Duplex (TDD) Code Division Multiple Access (CDMA) system or any other system using an extended algorithm (EA) in preference to a truncated algorithm (TA). The EA avoids implementation errors by choice of proper extended matrices, and accepts the use of one piece of hardware. The EA also obviates loss of multiple signals in the tail part of each data field, and avoids errors due to transformation of a Toeplitz matrix to a circulant matrix.10-30-2008
20100260292BLIND MODULATION DETECTION - In receiving a radio block comprising a plurality of bursts, burst data is saved prior to demodulating each burst using an independent preliminary modulation technique decision. When a global modulation technique decision over the radio burst is formulated, if the preliminary modulation technique decision for one or more bursts disagrees, data associated with that burst may be retrieved and demodulated using the global modulation technique decision. In one embodiment, the mismatching burst is erased and decoding over the block is attempted, with the second demodulation being performed only if a decoding metric indicates decode errors. In another embodiment, each mismatching block is re-demodulated as soon as a global modulation technique decision is formulated and a mismatch to the preliminary modulation technique decision is detected. In both embodiments, an increase in the number of soft bits improves decoder performance.10-14-2010
20120057657Precoded Data Receiver - A multi-rank beamforming (MRBF) scheme in which the downlink channel is estimated and an optimal precoding matrix to be used by the MRBF transmitter is determined accordingly. The optimal precoding matrix is selected from a codebook of matrices having a recursive structure which allows for efficient computation of the optimal precoding matrix and corresponding Signal to Interference and Noise Ratio (SINR). The codebook also enjoys a small storage footprint. Due to the computational efficiency and modest memory requirements, the optimal precoding determination can be made at user equipment (UE) and communicated to a transmitting base station over a limited uplink channel for implementation over the downlink channel.03-08-2012
20120014479SIGNAL RECEIVING APPARATUS AND SIGNAL PROCESSING METHOD OF THE SAME - A signal receiving apparatus and a signal processing method are provided. The signal receiving apparatus includes: a plurality of signal receiving units which receive analog signals; a plurality of radio frequency (RF) processing units which receive the analog signals from the plurality of signal receiving units and change frequencies of the received analog signals into intermediate frequencies; a plurality of analog-to digital (AD) converters which convert the analog signals having the intermediate frequencies into digital signals; a demodulating unit which demodulates the digital signals; a switching unit which is interposed between the plurality of AD converters and the demodulating unit; and a control unit which controls the switching unit to connect one of the plurality of AD converters to the demodulating unit based on a select signal to select one of the plurality of signal receiving units.01-19-2012
20120057659COMMUNICATION TERMINAL AND METHOD AND PROGRAM FOR CONTROLLING THE SAME - A communication apparatus includes two or more receiving units differing in characteristics. The apparatus further includes a data detecting unit detecting data to be received, in an input signal, and a selecting unit that selects one out of the two or more receiving units, depending upon detected result and characteristics of receiving units. In case data to be received is not contained in the input signal, the selecting unit selects a receiving unit whose power consumption during a period of time of not receiving the data is smaller than that of the other receiving unit(s) during a period of time of not receiving the data. In case the data to be received is contained in the input signal, the selecting unit selects a receiving unit from which a most satisfactory receiving quality is expected depending upon propagation environments of the input signal.03-08-2012
20120057658Authenticating a Signal Based on an Unknown Component Thereof - Authentication of a signal, signal03-08-2012
20120014480METHOD FOR SOFT MODULATION IN A WIRELESS TELECOMMUNICATION NETWORK - A method for soft remodulation in a receiver of transmissions over a wireless telecommunication system, the method including obtaining from a FEC decoder a-posteriori LLR values, converting the a-posteriori LLR values into bit probabilities and computing improved soft symbols estimates as expected values using the bit probabilities in a recursive algorithm. Preferably, the step of converting is implemented using a pre-computed Look Up Table (LUT). Preferably, the step of computing is implemented in a Multiplier-Accumulator having a SIMD structure.01-19-2012
20110064168METHOD AND APPARATUS FOR DETECTING SPACE-TIME BLOCK CODES - A method for detecting a space-time block code is provided. The method includes randomly selecting one initial candidate layer (x03-17-2011
20110064167System and Method for Transmitter and Receiver Operation for Multiple-Input, Multiple-Output Communications Based on Prior Channel Knowledge - A system and method for transmitter and receiver operation for multiple-input, multiple-output (MIMO) communications based on prior channel knowledge are provided. A method for receiver operations includes receiving a data block, determining if there is confidence in information related to a channel, detecting data in the data block with a first detector in response to determining that there is confidence in the information, and detecting the data in the data block with a second detector in response to determining that there is no confidence in the information. The data block is received over the channel.03-17-2011
20120114081Architectures For Universal Or Software Radio - A system and technique for providing to flexible, programmable frequency estimators and spectrum analyzers that can operate over extremely large bandwidths and yet provide high spectral resolution are described. The acquisition time and hardware complexity of one technique scale as O(N), where N denotes the number of frequency bins acquired. Embodiments are disclosed in which architectures are implemented using exponentially-tapered transmission lines and filter cascades.05-10-2012
20120114080DETERMINING RESPONSES OF RAPIDLY VARYING MIMO-OFDM COMMUNICATION CHANNELS USING OBSERVATION SCALARS - In an embodiment, a channel estimator includes first, second, and third stages. The first stage is configurable to generate a first observation scalar for a first communication path of a first communication channel, and the second stage is configurable to generate a second observation scalar for a first communication path of a second communication channel. And the third stage is configurable to generate channel-estimation coefficients in response to the first and second observation scalars. For example, such a channel estimator may use a recursive algorithm, such as a Vector State Scalar Observation (VSSO) Kalman algorithm, to estimate the responses of channels over which propagate simultaneous orthogonal-frequency-division-multiplexed (OFDM) signals (e.g., MIMO-OFDM signals) that suffer from inter-carrier interference (ICI) due to Doppler spread. Such a channel estimator may estimate the channel responses more accurately, more efficiently, with a less-complex algorithm, and with less-complex software or circuitry, than conventional channel estimators.05-10-2012
20120114079RADIO ARCHITECTURE FOR AN ULTRA LOW POWER RECEIVER - An ultra low power radio receiver architecture based on phase locked loop is provided. Embodiments of an ultra low power radio receiver architecture based on phase locked loop can detect a complex modulated MSK signal with only a single path receiver chain. According to an embodiment of the present invention, the overall power consumption of the radio receiver in the present invention can be reduced by almost fifty percent compared to that of the conventional complex path radio receiver architecture. The radio receiver architecture of the invention is suitable for the ultra low power radio application such as wireless sensor networks (WSN).05-10-2012
20120250801Intersymbol Interference Removal Method - An ISI removing method for a received signal executed by a receiver in an OFDM system to estimate a frequency-domain data signal carried on the received signal is provided. The method comprises the steps of: removing the first interference of known signal of the received signal; estimating a first data signal according to the received signal; performing a hard decision operation on the first data signal to generate a first frequency-domain signal; performing an Inverse Fast Fourier Transform operation on the first frequency-domain signal to generate a first time-domain signal; creating a tailing signal according to the first time-domain signal; removing a preamble signal from the received signal to generate a second signal; combining the first time-domain signal and the second signal to estimate the frequency-domain data signal.10-04-2012
20120250803METHOD FOR ERROR COMPENSATION IN AN OFDM SYSTEM WITH DIVERSITY - A method provides for an improved compensation of Fourier channel characteristics in a wireless communication embodiment. The method identifies one or more information carriers as pseudo pilot tones whose information may be realized to enhance the determination of the complex coefficient of the communication channel.10-04-2012
20120250802RECEIVER, RECEPTION METHOD, PROGRAM AND RECEPTION SYSTEM - Disclosed herein is a receiver including a determination block adapted to determine, as a gain used to adjust the power of a received signal received with a fixed bandwidth, a gain different from that used when other band is not contained in a band of the received signal if the band of the received signal contains a desired signal band and the other band.10-04-2012
20120269302PROCESS FOR DECODING ALAMOUTI BLOCK CODE IN AN OFDM SYSTEM, AND RECEIVER FOR THE SAME - A process for decoding a signal being representative of a Space Time or Frequency Block coding during two signaling periods (STBC) or two parallel channels (SFBC) is provided. The process receives an OFDM signal received from at least one antenna. The process also performs an OFDM demodulation in order to generate N frequency domain representations of the received signal. Then the process performs a decoding process on said OFDM demodulated signal and groups the received signal in word code, Y=(y10-25-2012
20120269300DIGITAL DOWNCONVERSION AND FAST CHANNEL SELECTION OF NARROWBAND SIGNALS USING A WIDE BAND RF TUNER - A wide band receiver to select and demodulate an input signal with single scan spectrum sensing by performing filtering on the input signal in digital domain to achieve improved selectivity and sensitivity is provided. The input signal includes one or more narrowband radio frequency (RF) signals. The wide band receiver includes a wide band tuner that down converts the one or more narrowband RF signals to one or more IF signals. An analog to digital converter (ADC) converts the one or more IF signals to one or more digital signals. A filter rejects out-of-band signals from the one or more digital signals to achieve the improved selectivity. A numeric controlled oscillator (NCO) selects at least one narrowband digital signal from the digital signals based on a phase value obtained from a spectrum selection control unit. A demodulator demodulates the narrowband digital signal to obtain a demodulated digital signal.10-25-2012
20120027134RECEIVING ENCODED DATA SLICES VIA WIRELESS COMMUNICATION - A method begins by a processing module determining a mapping of encoded data slices to wireless channels for wireless communication of data, wherein a data segment of the data is encoded in accordance with a dispersed storage error encoding protocol to produce a set of encoded data slices. The method continues with the processing module configuring, in accordance with the mapping, receivers of a wireless communication device to receive, via a set of wireless channels, at least some of the set of encoded data slices to produce configured receivers. The method continues with the processing module facilitating the configured receivers to receive encoded data slices of the set of encoded data slices to produce received encoded data slices and when at least a decode threshold number of received encoded data slices have been received, decoding the received encoded data slices to recapture the data segment.02-02-2012
20120027133DEMODULATION OF DATA COLLECTED PRIOR TO BIT EDGE DETECTION - An apparatus and method begin creation and storage of correlation sums to be demodulated (“early-collected sums”) prior to determination of a location of a bit of data in a wireless signal relative to a local clock. Such early storage allows demodulation of these early-collected sums at a later time, specifically on determination of the data's location in the wireless signal, thereby to yield early-collected data bits. Additionally, after determination of the data bit's location in the wireless signal, additional data bits are further generated in the normal manner, by demodulating the wireless signal, thereby to yield normally-collected data bits. Use of early-collected data bits in generating navigation data reduces the time to start data demodulation, and enables fewer normally-collected data bits to be used to generate navigation data, in several aspects of the invention.02-02-2012
20120063550Receiver with Orthogonal Beam Forming Technique - A receiver with orthogonal beam forming technique is achieved that is capable of differentiating different signal components within the received composite signal. An adaptive processor is used to eliminate the signal component whose phase information is known or can be calculated. The phase information of the major component of a signal can be easily acquired by using a limiter. The phase information of other signal components can be acquired by their direction information and other characteristics, such as modulation scheme, etc. Multiple orthogonal beams can be formed by eliminating one unwanted signal component each time by the adaptive processor until all unwanted signal is eliminated. Thus, a composite signal from multiple sources can be broken down into their component signals.03-15-2012
20090135963Apparatus and method for adaptive receive signal decoding based on channel variation in communication system - An apparatus for adaptively decoding based on a channel variation at a receiver of a communication system supporting an Alamouti mode is provided. The apparatus includes a channel variation estimator for estimating the channel variation; a channel estimator for estimating a channel value of successive channel periods or a channel value of each channel period by comparing the estimated channel variation with a threshold; an Alamouti decoder for decoding a receive signal using an Alamouti method when the estimated channel variation is less than or equal to the threshold; and a Spatial Multiplexing (SM) decoder for decoding the receive signal using an SM method having a square channel matrix when the estimated channel variation is greater than the threshold.05-28-2009
20090135960Communication Device - In a communication device for receiving signals from devices that become communication partners, received signals from the respective devices are identified. Each of the devices that become communication partners is provided with a frequency spectrum of a pattern specific to each of the devices. In the communication device, storage means stores correspondence between information identifying the devices that become communication partners and the frequency spectrums provided to the respective devices, acquisition means acquires a frequency spectrum contained in a received signal, identification means compares the frequency spectrum acquired by the acquisition means with the frequency spectrums stored by the storage means to identify a device corresponding to the frequency spectrum that coincides with the frequency spectrum acquired by the acquisition means and which is stored by the storage means.05-28-2009
20090135959APPARATUS AND METHOD FOR DETECTING A MISSING PULSE IN COMPLEMENTARY CODED IRREGULAR SIGNALS - An apparatus and method for decoding complementary coded irregular data streams including a missing pulse detector circuit. The missing pulse detector circuit includes electrical circuit components configured to receive first and second irregular data streams, and output a data stream corresponding to a valid input data stream only when the two received data streams are bit-for-bit complements of each other.05-28-2009
20090135958Controlled Transmission of Data in a Data Transmission System - This disclosure relates to controlled transmission of data in a data transmission system. Data from data interface elements may be transmitted in a controlled manner during the guard intervals or cyclic expansions of received RF signals. The received RF signals may be initially analyzed by a receiver to gather its characteristics. Based on the characteristics, the data interface elements are instructed to transfer the data during the guard intervals of the incoming RF signals.05-28-2009
20120300884METHOD AND DEVICE FOR CHANNEL ESTIMATION IN ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING SYSTEM - The present invention discloses a channel estimation method and device in an orthogonal frequency division multiplexing system. The method includes steps of: A. grouping physical resource blocks in the bandwidth of the orthogonal frequency division multiplexing system; B. extracting at least one group from groups for channel estimation to acquire a channel coefficient, wherein the number of the extracted groups is less than the total number of groups; C. completing the MIMO demodulation by using the acquired channel coefficient; D. judging whether the channel estimation on the grouping has been completed, if yes, ending, otherwise, returning to step B. The device divides the physical resource blocks (PRB) in the bandwidth of the orthogonal frequency division multiplexing system into several groups and then carries out channel estimation processing on each group of resource blocks successively and individually, so as to achieve memory sharing and save storage amount.11-29-2012
20120300883DEMODULATION CIRCUIT, DEMODULATION METHOD AND RECEIVING APPARATUS - A demodulation circuit includes a hard decision process unit and a soft decision process unit. The hard decision process unit is configured to perform a hard decision process using a demodulated signal, and the demodulated signal is a demodulated received signal. The soft decision process unit is configured to determine a range of assignment with respect to a transitioning part in the demodulated signal, calculate a likelihood value of a bit, and perform a soft decision process.11-29-2012
20100014614Digital Radio Systems - Apparatus comprising a pre-filter rake architecture with various features designed to, in at least some circumstances, to lessen the data processing burden associated with the architecture. In one embodiment, the pre-filter aspect can be disabled.01-21-2010
20120106682Controlled Transmission of Data in a Data Transmission System - This disclosure relates to controlled transmission of data in a data transmission system. Data from data interface elements may be transmitted in a controlled manner during the guard intervals or cyclic expansions of received RF signals. The received RF signals may be initially analyzed by a receiver to gather its characteristics. Based on the characteristics, the data interface elements are instructed to transfer the data during the guard intervals of the incoming RF signals.05-03-2012
20120106680CREST FACTOR REDUCTION IN MULTICARRIER TRANSMISSION SCHEMES - A multicarrier transmission system uses a set of carriers spaced apart in frequency with a number of bits being assigned to each carrier. A transmitter has a mapper which maps a data signal to a parallel set of constellation values. A frequency domain-to-time domain transform stage converts the set of modulated carriers to a time-domain signal. A peak detector detects when the time-domain signal exceeds a predetermined criterion. A constellation modifier modifies the constellation value of at least one of the carriers to reduce the crest factor of the transmitted signal. A carrier is selected for modifying on the basis of a number of bits allocated to that carrier. The constellation modifier can select an alternative constellation value by an iterative method or by calculation. The constellation modifier can operate entirely in the time-domain.05-03-2012
20090003492High Data Rate Demodulation System - The demodulation process of a wireless data transmission system using multi-level symbols makes use of templates corresponding to each of the possible symbol transitions, so that knowledge of previously decoded symbols can be use to decode the next one. The weighting and/or timing of individual samples of each symbol is varied in response to the performance of the symbol identification process.01-01-2009
20120155578MULTI-RAKE RECEIVER - A receiver includes a select module, an enable module, and a receiver module. The select module is configured to detect (i) a number of antennas in the receiver, or (ii) a number of enabled receiver paths in the receiver. The select module is also configured to generate a receiver select signal and an adjustment signal based on (i) the number of antennas detected, or (ii) the number of enabled receiver paths detected. The enable module is configured to, based on the receiver select signal, (i) determine that at least one of the enabled receiver paths is an unnecessary receiver path, and (ii) disable the at least one of the enabled receiver paths. The receiver module is configured to, based on the adjustment signal, adjust a bandwidth of the receiver or coefficient values of the receiver.06-21-2012
20120155577CHANNEL ESTIMATION FOR DVB-T2 DEMODULATION USING AN ADAPTIVE PREDICTION TECHNIQUE - According to various embodiments, a method is disclosed that includes receiving an orthogonal frequency-division multiplexing (OFDM) modulated signal at a modulator; filtering the received modulated signal using a plurality of sets of filter coefficients with a linear predictor algorithm; and estimating a channel frequency response based on the filtering.06-21-2012
20120155576Receiver Power Reduction Methods and Apparatus - Methods and apparatus for controlling a receiver based on a received signal include receiving the signal; generating, based on a portion of the signal, a SIR estimate; comparing the SIR estimate and a threshold value; and demodulating a remaining portion of the signal only if the SIR estimate passes the threshold value.06-21-2012
20120155575INTEGRATED DEMODULATOR, FILTER AND DECIMATOR (DFD) FOR A RADIO RECEIVER - A superheterodyne receiver includes an A/D converter for converting an IF signal to a stream of samples at a sampling frequency that is four times the IF and a splitter that splits the stream of samples into a first set of even samples and a second set of odd samples. A first quadrature demodulator demodulates just the first set of even samples to produce one of real (I) and imaginary (Q) components of a complex signal at one half of the sampling frequency, and a second, parallel quadrature demodulator demodulates just the second set of odd samples to produce the other of the I and Q components. The demodulated first set is filtered using a first subset of filter coefficients, and the demodulated second set is filtered using a second subset of filter coefficients. The filter outputs correspond to a baseband complex signal. The technology disclosed reduces overall hardware complexity and operating frequency by a factor of two or more.06-21-2012
20110080980MULTI-FEED DIVERSITY RECEIVE SYSTEM AND METHOD - Embodiments disclosed herein relate to diversity receive systems and methods. An antenna system may comprise a reflector and a plurality of feed antennas configured to receive a wireless signal from a common source with directional diversity. A receive system may comprise such antenna system in combination with a plurality of receivers and/or demodulators, and in combination with a combiner and/or controller.04-07-2011
20120106681METHOD FOR CONFIGURING A TELECOMMUNICATION SYSTEM - The invention relates to a method for configuring a telecommunication system comprising at least one sending entity and one receiving entity between which the same link transmits several transport channels with different qualities of service. The sending entity matches the rate between the different coded transport channels with separate qualities of service, and the different coded transport channels are then multiplexed. The matching rate specific to each coded transport channel is determined from at least one first parameter representative of the expected Eb/I ratio and a second parameter representative of the capacity of the physical channel.05-03-2012
20090097594MIRROR SUB-CARRIER DEMODULATION CIRCUIT, RECEIVING DEVICE WITH THE SAME, AND MIRROR SUB-CARRIER DEMODULATING METHOD - A mirror sub-carrier demodulation circuit includes a waveform generation unit 04-16-2009
20100172445RECEIVER APPARATUS AND METHOD FOR RECEIVING DATA UNITS OVER A CHANNEL - When transmitting medium access control protocol data units for the high speed downlink shared channel over a plurality of hybrid automatic repeat request processes, one of the processes can be in a retransmission procedure. In this case, stalling of the transmission can occur, because the medium access control layer for the high speed downlink shared channel of the receiver apparatus (07-08-2010
20110103526Method and System for Mitigating the Effects of Pulling in Multiple Phase Locked Loops in Multi-Standard Systems - Certain aspects of a method and system for mitigating effects of pulling in multiple phase locked loops in multi-standard systems may include selecting an input frequency range of operation at a voltage controlled oscillator based on a particular wireless band of operation in a system that handles a first wireless communication protocol and a second wireless communication protocol. An image rejection mixer may be enabled to generate an output signal for the particular wireless band of operation based on mixing a plurality of received signals within a selected frequency range. An in-phase (I) component and a quadrature (Q) component of the generated output signal may be generated by utilizing a RC-CR quadrature network.05-05-2011
20110103523SINGLE-BURST ACQUISITION FOR WIRELESS COMMUNICATION SYSTEM - Techniques for performing acquisition of packets are described. First detection values may be determined based on a first plurality of samples, e.g., by performing delay-multiply-integrate on the samples. Power values may be determined based on the first plurality of samples, e.g., by performing multiply-integrate on the samples. The first detection values may be averaged to obtain average detection values. The power values may also be averaged to obtain average power values. Whether a packet is presence may be determined based on the average detection values and the average power values. Second detection values may be determined based on a second plurality of samples. The start or the packet may be determined based on the first and second detection values. A third detection value may be determined based on a third plurality of samples. Frequency error of the packet may be estimated based on the first and third detection values.05-05-2011
20110103522Soft Decision Method and Associated Signal Receiving System - A soft decision method for determining a soft decision coordinate associated with a constellation is provided. The soft decision coordinate includes a first soft decision sub-coordinate and a second soft decision sub-coordinate. The method includes receiving an input signal including a coordinate value; defining a first coordinate range on a coordinate axis in the constellation, the first coordinate range having a first limit and a second limit; obtaining the first soft decision sub-coordinate according to the first coordinate range; defining a second coordinate range on the coordinate axis in the constellation, the second coordinate range having a third limit and a fourth limit; and obtaining the second soft decision sub-coordinate according to the second coordinate range; wherein the first and the third limit do not simultaneously equal to the second and the fourth limit.05-05-2011
20110103521METHOD AND APPARATUS FOR DECOMPOSING RECEIVED SYMBOL SIGNAL MODULATED WITH BIT REFLECTED GRAY CODE IN BIT INFORMATION - Disclosed is a method and apparatus for composing a received symbol signal modulated with a bit reflected Gray code into bit information. According to an embodiment of the present invention, a positive integer of the received symbol signal having bits is assigned according to the Gray mapping rule, and a sign is determined. A value that is indicative of an arrangement of the bits constituting the received symbol signal is calculated. A boundary value in at least one bit group consisting of the bits constituting the received symbol signal is acquired, and a difference from an absolute value of the received symbol signal is calculated. The received symbol signal is converted into information per bit using a value of the received symbol signal based on the positive integer and the determined sign, the value that is indicative of the bit arrangement, and the difference from the absolute value. Therefore, it is possible to reduce complexity in bitwise decomposition for an iterative decoder inevitably used in a receiver.05-05-2011
20110103520METHOD AND APPARATUS FOR INTERFERER PARAMETER ESTIMATION USING MULTIPLE RECEIVER ARBITRATION - In one embodiment, a receiver implements a method of demodulating a set of symbols dispersed within a time-frequency grid of a received OFDM signal. The method includes determining which one of two or more demodulators is preferred for use in a given region of the time-frequency grid by evaluating detection statistics generated by the demodulators for the set of symbols. Each demodulator operates according to different demodulation parameters that correspond to different interference assumptions. The method further includes recovering the set of symbols for decoding using whichever demodulator is preferred for each symbol according to the region from which the symbol is recovered. The method may be further extended by updating each demodulator's demodulation parameters using reference and/or data symbols from the region(s) where that demodulator is preferred, and recovering the desired symbols using the updated demodulation parameters. Such updating can be further iterated, for additional demodulation parameter refinement.05-05-2011
20120121044WIRELESS COMMUNICATION TERMINAL - A wireless communication terminal includes an antenna selecting unit that selects, for each packet, an antenna for use in receiving signals from among a plurality of a plurality of antennas; a packet-destination judging unit that judges whether a packet obtained by demodulating a signal received by the receiving antenna selected by the antenna selecting unit is destined for the wireless communication terminal; and a stand-by-antenna determining unit that determines a stand-by antenna for use in receiving a packet to be received next based on a result of selection made by the antenna selecting unit and a result of judgment made by the packet-destination judging unit.05-17-2012
20100290567PROCESSING METHOD FOR PROVIDING, STARTING FROM SIGNALS ACQUIRED BY A SET OF SENSORS, AN AGGREGATE SIGNAL AND DATA ACQUISITION SYSTEM USING SUCH METHOD - Embodiment for forming an aggregate signal from a plurality of starting signals, comprising:11-18-2010
20100290566WIRELESS DEVICE - A wireless device is configured so that an RF-IC unit calculates a difference value between IQ data received by an antenna Ant11-18-2010
20100246727Multi-Antenna Subsystem for Software Defined Radio - The present invention relates to a multi-antenna subsystem for a SDR (software defined radio) capable of supporting a multi-antenna technique to an antenna system using a multi-antenna subsystem. The multi-antenna subsystem of a multi-antenna system includes an algorithm executing unit for carrying out an algorithm for a multi-antenna technique to be required in the multi-antenna system, a frame synchronization unit for a synchronization acquisition, and a control unit for controlling the algorithm executing unit and the frame synchronization. The algorithm executing unit has a plurality of functional blocks and the functional block has state information, which can be referred by other functional blocks, for supporting SDR system.09-30-2010
20100246728SYSTEM AND METHOD FOR REACQUISITION OF A GATED PILOT - Systems and techniques are disclosed wherein a gated pilot signal can be re-acquired faster by searching a last known pilot offset and/or searching a last coset in which the last pilot signal was found.09-30-2010
20100246726RECEIVER AND METHOD OF RECEIVING - A receiver recovers data from Orthogonal Frequency Division Multiplexed (OFDM) symbols, the OFDM symbols including sub-carrier symbols carrying data symbols and sub-carrier signals carrying pilot symbols. The receiver includes a Fourier transform processor arranged in operation to receive a time domain digital version of the OFDM symbols and to form a frequency domain version of the OFDM symbols, from which the pilot symbol sub-carriers and the data symbol bearing sub-carriers can be recovered, and a detector arranged in operation to recover the data symbols from the data bearing sub-carriers of the OFDM symbols. The receiver includes a noise estimator arranged in operation to generate a long term estimate of noise power in the frequency domain version of the OFDM symbols at a plurality of frequencies, by accumulating an average noise power at the plurality of frequencies from a plurality of the OFDM symbols, and for generating an estimate of a current level of the noise power in the frequency domain version of a current one of the OFDM symbols at the plurality of frequencies. An impulsive noise detector detects the presence of an impulse of noise in the current OFDM symbol, by comparing the noise power in the current OFDM symbol with the long term noise power at the plurality of frequencies, and to generate an impulse noise flag to indicate that the current OFDM symbol is affected by an impulse of noise if the comparison indicates the presence of an impulse of noise. Impulsive noise in the time domain will generate an increase in noise level across the frequency bandwidth of the OFDM symbols. If all frequencies experience an increase then an impulse of noise can be detected. Thereafter the detector can conceal the effect of the impulse noise on the recovering of the data symbols from the data bearing sub-carriers, for example by adapting channel state information for use in de-mapping modulated symbols into data symbols.09-30-2010
20100246725Selective diversity receiving method and apparatus - In a selective diversity receiver with two antennas, the strength of the signal received by each antenna is measured at a present and a past time, the difference between the present strengths of the signals received by the two antennas is calculated, and the difference between the present and past strengths of the signal received by each antenna is calculated. If the difference between the present strengths of the two signals is not too large, the signal with the smaller past-to-present strength difference and accordingly with less fading is selected for further reception. In a portable electronic device, this antenna switching strategy reduces susceptibility to human body interference. The present and past strengths can be measured during the preambles of different packets to avoid switching antennas during data reception.09-30-2010
20100246724APPARATUS AND METHOD FOR RECEIVING A RADIO SIGNAL - [Problem] The present invention relates to a radio frequency signal receiver, and more particularly, to a radio frequency signal receiver of a communication system, in which local devices exchange a radio frequency signal with each other. The object of the present invention is to provide a radio frequency signal receiver that exactly restores data from a received signal without a complex circuit restoring a phase of a received signal. It is another object of the present invention to provide a radio frequency signal receiver that eliminates noise when the noise is included in the received signal, estimates an exact data rate of the received signal, and exactly restores received information based on the estimated data rate thereof.09-30-2010
20100246729SAMPLING METHOD, RECONSTRUCTION METHOD, AND DEVICE FOR SAMPLING AND/OR RECONSTRUCTING SIGNALS - Reconstruction method for reconstructing a first signal (x(t)) regularly sampled at a sub-Nyquist rate, comprising the step of retrieving from the regularly spaced sampled values (y09-30-2010
20120314816ENVELOPE DETECTOR AND ASSOCIATED METHOD - An envelope detecting method performing squelch detection on a pair of differential signal includes: by a voltage divider, providing a real-time reference signal according to a sum of the pair of differential signals; and comparing two comparison signals associated with the real-time reference signals and the pair of differential signals to generate a squelch detection signal.12-13-2012
20120128103SYMBOL RATE DETECTOR AND RECEIVER - The symbol rate detector includes a nonlinear processing section configured to perform nonlinear processing on a digitally modulated signal, and to output a processed signal, and a phase-locked loop being in synchronization with the processed signal. The phase-locked loop includes an oscillator configured to generate a signal with a frequency corresponding to a detected symbol rate, a complex multiplier configured to multiply the processed signal by the signal generated by the oscillator, and to output a multiplication result, and a loop filter configured to smooth the multiplication result, and to output the smoothed multiplication result as the detected symbol rate.05-24-2012
20120128102L-VALUE GENERATION IN A DECODER - An apparatus having a first circuit, a second circuit and a third circuit is disclosed. The first circuit may be configured to generate a plurality of load values corresponding to a trellis of a decoding process. The second circuit generally includes a plurality of calculation layers. The calculation layers may be configured to generate a plurality of maximum values in response to the load values. The third circuit may be configured to generate a plurality of L-values of the decoding process in response to the maximum values.05-24-2012
20120163511Frequency Division Multiplexing System with Selectable Rate - An OFDM system uses a normal mode which has a symbol length T, a guard time TG and a set of N sub-carriers, which are orthogonal over the time T, and one or more fallback modes which have symbol lengths KT and guard times KTG where K is an integer greater than unity. The same set of N sub-carriers is used for the fallback modes as for the normal mode. Since the same set of sub-carriers is used, the overall bandwidth is substantially constant, so alias filtering does not need to be adaptive. The Fourier transform operations are the same as for the normal mode. Thus fallback modes are provided with little hardware cost. In the fallback modes the increased guard time provides better delay spread tolerance and the increased symbol length provides improved signal to noise performance, and thus increased range, at the cost of reduced data rate.06-28-2012
20120163512PROCESSING NODES AND METHODS OF ESTIMATING INTERFERENCE IN A RADIO TELECOMMUNICATION NETWORK - A processing node (06-28-2012
20120163509DIGITALLY DEMODULATING A MINIMUM-SHIFT KEYING (MSK) SIGNAL - A two stage process is applied for recovering the modulating content from the received I-Q waveforms of a MSK modulated signal. In the first stage, at each incoming symbol the I-Q waveform segments of the input belonging to the three most recently received symbols are used in hypothesis testing. A matched filter bank produces ratings for each of the possible three symbol modulating patterns in proportion to the likelihood that the combination in question may have produced the current but by now impaired input segment. While the three symbol window slides symbol-by-symbol over the input the successive hypothesis tests are not independent as each symbol is involved in three consecutive tests. The dependence thus created lays the foundation and provides the branch metrics for applying the Viterbi algorithm for the determination of the modulating symbols in the second stage.06-28-2012
20120163508SUBCARRIER PLACEMENT STRATEGY FOR A MULTI-CARRIER SIGNAL - Communication devices and methods for transmitting and receiving a wideband signal using aggregated discontiguous narrowband channels in a band are presented. During transmission, a fold point is determined in which symmetric free channels are sufficient to transmit the signal. The signal is then synthesized by aggregating the data in the channels and transmitted using the fold point as the up-conversion modulation frequency. During reception, information regarding which channels are being used to provide data signals and which channels are occupied by interferers is received. This information is used to determine one or more fold points as the down-conversion modulation frequencies. The fold points are selected such that an image of each interferer falls on an unoccupied channel or a narrowband channel occupied by another interferer.06-28-2012
20100208851METHOD AND SYSTEM FOR IMPROVING RECEPTION IN WIRED AND WIRELESS RECEIVERS THROUGH REDUNDANCY AND ITERATIVE PROCESSING - A method and system for improving reception in wired and wireless systems through redundancy and iterative processing are provided. A multilayer decoding process may comprise a burst process and a frame process. Results from a first burst process may be utilized to generate a decoded bit sequence in the frame process. The frame process may utilize redundancy information and physical constraints to improve the performance of a decoding algorithm. Results from the frame process may be fed back for a second iteration of the burst process and of the frame process, to further improve the decoding operation. In some instances, the second iteration of the burst process may be based on a gradient search approach.08-19-2010
20100208849RECEIVING CIRCUIT, USE, AND METHOD FOR RECEIVING AN ENCODED AND MODULATED RADIO SIGNAL - A receiving circuit, use, and method for receiving an encoded and modulated radio signal is provided. The circuit comprise a demodulator and a digital filter connected downstream of the demodulator for moving averaging. The filter has at least two FIFO registers and subtractors. Whereby for subtracting an output value of the FIFO register from an input value of the FIFO register a subtractor is connected to each FIFO register. Wherein the filter has a weighting unit, which is connected downstream of each FIFO register, and wherein the filter has an integrator, which is connected downstream of the subtractors for integration.08-19-2010
20100208847OFDM Receiver for Dispersive Environment - A received OFDM signal is processed to determine a plurality of reference delays, which may include the path delays of a multipath channel. The effective channel estimates corresponding to each reference delay are determined, as is the covariance of the ISI and noise components observed at each delay. Combining weights resulting in maximum post-combining SINR are determined for all subcarriers. A corresponding plurality of FFTs is applied to the incoming sample stream, one at each of the reference delays. The individual subcarriers from each FFT output are then combined using the combining weights. This produces a single FFT output with suppressed ISI, which is used in further processing.08-19-2010
20100208848MOBILE WIRELESS COMMUNICATIONS DEVICE WITH SEPARATE IN-PHASE (I) AND QUADRATURE (Q) PHASE POWER AMPLIFICATION AND POWER AMPLIFIER PRE-DISTORTION AND IQ BALANCE COMPENSATION - A communications device, in one aspect as a portable wireless communications device, includes an in-phase modulator and power amplifier that receives a baseband I signal and modulates and amplifies the I signal. A quadrature modulator and power amplifier receives a baseband Q signal and modulates and amplifies the Q signal. A power combiner sums and outputs the I and Q signals. An I demodulator circuit receives a signal fed back from the I power amplifier and demodulates the fed back signal to produce demodulated I signals. A Q demodulator circuit receives a signal fed back from the Q power amplifier and demodulates the fed back signal to produce demodulated Q signals. A processor compares the digital, baseband I and Q signals with a demodulated I and Q signals to compensate for amplitude, frequency and phase modulation errors.08-19-2010
20120213314DIGITAL DEMODULATION OF PULSE-WIDTH MODULATED SIGNALS - A digital PWM demodulator includes a first set of delay cells to receive a PWM signal and to propagate the PWM signal in a forward direction for a first interval. Delayed signals obtained at the end of the first interval are propagated in the reverse direction through the delay cells for a second interval. A logic zero feeds into the last cell at the start of the second interval. The output of a last cell in the delay cells at the end of the second interval is indicative of a data value modulated on the PWM signal. The digital PWM demodulator includes a second set of delay cells designed to operate identical to the first set of delay cells. The first set of delay cells and the second set of delay cells in conjunction with additional digital circuitry demodulate alternate periods of the PWM signal.08-23-2012
20120134447RADIO COMMUNICATION APPARATUS - According to one embodiment, an analog unit performs frequency conversion of a reception signal. A digital unit performs demodulation processing of the reception signal subjected to the frequency conversion by the analog unit. A PLL circuit generates a clock of the digital unit. A PLL-setting changing unit performs, based on the reception signal, a setting change of parameters of the PLL circuit to thereby control the jitter of the clock.05-31-2012
20120134450DETECTION AND MITIGATION OF TEMPORARY IMPAIRMENTS IN A COMMUNICATIONS CHANNEL - Systems and methods are disclosed for detecting temporary high level impairments, such as noise or interference, for example, in a communications channel, and subsequently, mitigating the deleterious effects of the dynamic impairments. In one embodiment, the method not only performs dynamic characterization of channel fidelity against impairments, but also uses this dynamic characterization of the channel fidelity to adapt the receiver processing and to affect an improvement in the performance of the receiver. For example, in this embodiment, the method increases the accuracy of the estimation of the transmitted information, or similarly, increases the probability of making the correct estimates of the transmitted information, even in the presence of temporary severe levels of impairment. The channel fidelity history may also be stored and catalogued for use in, for example, future optimization of the transmit waveform.05-31-2012
20120134449SOFTWARE RADIO SYSTEM, DECODING APPARATUS AND METHOD THEREOF - The present invention relates to a software radio system and a decoding apparatus and method thereof. According to an embodiment of the present invention, there is provided a forward error correction decoding apparatus for a software radio system, including: a receiving module for receiving decoding tasks from a plurality of uplink channels; and a decoder matrix for executing the decoding tasks, wherein the decoder matrix is shared by the plurality of uplink channels. The decoding apparatus and method as well as the software radio system according to the embodiments of the present invention can be well adapted to the high computing capabilities, sufficient flexibility and scalability as required by base station systems for next-generation wireless communication systems.05-31-2012
20090097593BROADCAST DEMODULATION DEVICE - In a demodulation device with a plurality of branches, the receiving quality of each branch and signal quality after composing signals from the plurality of branches is inspected. If the signal quality is good, the operation of a branch whose receiving quality of each branch is the worst is stopped. When activating a stopped branch, the synchronous detection information of an already operated branch is applied to a branch to be newly activated and time needed for a newly activated branch to become synchronous is reduced.04-16-2009
20100329393MOBILE COMMUNICATION SYSTEM, RECEIVING DEVICE, AND METHOD - A transmitting device Fourier-transforms symbols in a transmission symbol sequence, maps the Fourier-transformed symbols to subcarriers, inverse-Fourier-transforms the mapped symbols, and transmits the inverse-Fourier-transformed symbols from multiple transmitting antennas. A receiving device Fourier-transforms received signals, extracts signal components mapped to the subcarriers, and estimates the symbols transmitted via the subcarriers by applying a QR decomposition algorithm to the extracted signal components. The receiving device obtains a unitary matrix Q12-30-2010
20120163507Carrier Recovery Method And Carrier Recovery Device For Pseudo Random Noise Based System - The invention regards to Carrier recovery device, especially estimator device for carrier recovery, for pseudo random noise based systems, comprising a coarse estimator (06-28-2012
20090060094Transmitting/receiving apparatus and method for interleaver division multiple access system - Provided is a transmitting/receiving apparatus and method for an IDMA system. The receiving apparatus includes a channel estimator, an estimator, and a determiner. The channel estimator estimates a channel using a multi-user signal received through at least one RX antenna. The estimator estimates the noise power and the signal power for each transmission layer of each user by using the estimated channel value from the channel estimator. The determiner determines the number of transmission layers for each user and an MCS level for each transmission layer by using the signal power and the noise power estimated by the estimator.03-05-2009
20090060093MULTI-FUNCTION DECODER ENGINE IN WIRELESS RECEIVER - Systems, methods, devices, and processors are described for a wireless receiver. The receiver may be configured to receive signals transmitted according to various mobile digital television standards. The receiver may include a number of hardware engines. The hardware engines may be individually controlled in a number of aspects. Power to particular hardware engines may be controlled, and the speed of the different hardware engines may vary. The receiver may include a novel multi-function decoder engine. The receiver may be configured to dynamically avoid problems related to harmonics, and may include a novel tap configuration with taps at different locations in the data flow.03-05-2009
20120170690AUTO CONFIGURABLE 2/3 WIRE SERIAL INTERFACE - An automatically configurable 2-wire/3-wire serial communications interface (AC23SCI), which includes start-of-sequence (SOS) detection circuitry and sequence processing circuitry, is disclosed. When the SOS detection circuitry is coupled to a 2-wire serial communications bus, the SOS detection circuitry detects an SOS of a received sequence based on a serial data signal and a serial clock signal. When the SOS detection circuitry is coupled to a 3-wire serial communications bus, the SOS detection circuitry detects the SOS of the received sequence based on a chip select (CS) signal. The SOS detection circuitry provides an indication of detection of the SOS to the sequence processing circuitry, which initiates processing of the received sequence using the serial data signal and the serial clock signal upon the detection of the SOS. As such, the AC23SCI automatically configures itself for operation with some 2-wire and some 3-wire serial communications buses without external intervention.07-05-2012
20120170692CLOCK DATA RECOVERY CIRCUIT AND CLOCK DATA RECOVERY METHOD - A clock data recovery circuit includes: a demodulation filter that receives a transmission signal transmitted by two orthogonal carrier waves having I and Q phases and executes demodulation to obtain a demodulated wave having an phase and a demodulated wave having a Q phase from the transmission signal; a first determination circuit that determines whether an absolute value of one of the two demodulated waves is greater than an eye opening maximum value at an ideal clock phase of the transmission signal; a second determination circuit that determines whether the one demodulated wave is greater than zero; a third determination circuit that determines whether the other one of the two demodulated waves is greater than zero; and a phase comparison unit that detects whether a phase of a clock signal included in the transmission signal is leading a phase of a data signal included in the transmission signal, based on determination results obtained by the first to third determination circuits.07-05-2012
20120170689Geometry Based Efficient Decoder for Underdetermined MIMO Systems and Decoding Method Thereof - A decoder for underdetermined MIMO systems with low decoding complexity is provided. The decoder consists of two stages: 1. Obtaining all valid candidate points efficiently by slab decoder. 2. Finding the optimal solution by conducting the intersectional operations with dynamic radius adaptation to the candidate set obtained from Stage 1. A reordering strategy is also disclosed. The reordering can be incorporated into the proposed decoding algorithm to provide a lower computational complexity and near-ML decoding performance for underdetermined MIMO systems.07-05-2012
20120170691INTERFERENCE CANCELLATION AND IMPROVED SIGNAL-TO-NOISE RATIO CIRCUITS, SYSTEMS, AND METHODS - Interference cancellation for wideband and narrowband communications systems is provided without apriori knowledge of statistical information about an interfering signal. In one embodiment a demodulator circuit can operate in an environment where a “no lock” situation would normally occur to remove the interference and acquire signals in low signal-to-noise ratio (SNR) conditions and high signal-to-interference ration (SIR) conditions. In other embodiments, performance is improved by introducing statistics of the interfering signal, and these statistics regarding the communications channel and interference properties (i.e., characteristics of the interfering signal) can be adaptive or “learned” in other embodiments.07-05-2012
20120170688DEMODULATOR OF DIGITAL MODULATED SIGNAL, RECEIVER APPARATUS EMPLOYING THE DEMODULATOR, AND DEMODULATION METHOD - A demodulator comprising an input structured to receive at least one past value and a current value both associated with the same bit transmitted in different time instants, a bit decoder configured to provide a decoded bit from an input value, a quality signal evaluation module configured to provide a quality signal representing a quality of the current value, and a filtering module structured to provide a filtered value computed as a weighted average of said at least one past value and said current value. Moreover the demodulator comprises a selection module connected between said input and said bit decoder, configured to transfer the current value as the input value of the bit decoder if the quality is greater than a reference value or transfer the filtered value as the input value of the bit decoder if the quality is not greater than the reference value.07-05-2012
20100054370DEMODULATION METHOD AND DEMODULATOR OF PULSE-EDGE SHIFTED PULSE - A variable delay circuit delays a carrier signal having a predetermined frequency, and outputs a modulated signal. A delay setting unit sets a delay period for the variable delay circuit according to a data signal to be modulated. The delay setting unit assigns each symbol in the data signal to any one of positive edges and negative edges in the carrier signal, and sets a delay period for the variable delay circuit at the timing at which a positive edge in the carrier signal passes through the variable delay circuit, according to the symbol value in the data signal assigned to the positive edge. Furthermore, the delay setting unit sets a delay period for the variable delay circuit at the timing at which a negative edge in the carrier signal passes through the variable delay circuit, according to the symbol value in the data signal assigned to the negative edge.03-04-2010
20090279645Device for Reading Information on a Digital Bus Without a Wire Connection to the Network - A device for reading information recovers signals exchanged on a digital data communications bus (11-12-2009
20120076246AUTOMATIC GAIN CONTROL DEVICE AND ELECTRONIC DEVICE - An automatic gain control device includes amplifiers cascaded, each having a variable gain; level measurement portions respectively corresponding to the amplifiers, where each of the level measurement portions measures a level of an output signal of a corresponding one of the amplifiers in a level measurement period indicated by a level measurement signal; error calculators respectively corresponding to the level measurement portions, where each of the error calculators compares a level measured by a corresponding one of the level measurement portions with a threshold which is set so that a corresponding one of the amplifiers will not saturate, and outputs a comparison result as an error signal; a gain computation section which updates one of the gains of the amplifiers at a time corresponding to a gain update signal, based on the error signals; and an operation controller which generates the level measurement signal and the gain update signal.03-29-2012
20120076245SIGNAL DETECTION APPARATUS - A signal detection apparatus detects the frequency of an input signal without using a PLL. The detection apparatus includes a first and a second orthogonalizer, a phase difference calculator and an integrator, to control the variable coefficient a03-29-2012
20120076244WAVEFORM INTERPOLATOR ARCHITECTURE FOR ACCURATE TIMING RECOVERY BASED ON UP-SAMPLING TECHNIQUE - In one embodiment, an interpolator-based timing recovery system improves accuracy by calculating additional sampled signals of a digital signal and generating an interpolation based on the additional sampled signals and the digital signal, while employing a parallel architecture to maintain system clock frequency and a pipeline architecture to minimize sampled data memory requirement.03-29-2012
20120314819SYSTEM AND METHOD FOR RADIO SIGNAL RECONSTRUCTION USING SIGNAL PROCESSOR - A waveform reconstruction circuit receives an rf signal from an antenna, digitizes it, and then generates an undistorted reconstructed waveform. The reconstructed waveform can then be conventionally mixed and demodulated to extract useful signal information with enhanced receiver fidelity and sensitivity.12-13-2012
20120177151APPARATUS AND METHOD FOR ADAPTIVE I/Q IMBALANCE COMPENSATION - An I/Q imbalance compensation block of a RF receiver for compensating an imbalance between an in-phase component and a quadrature component of an RF signal is disclosed. The compensation block includes a conjugation block; an adaptive finite impulse response (FIR) filter; and an adder. The filter use filter coefficients iteratively updated at least partly in response to a compensated digital signal. The filter can have a complex number for at least one, but not all of filter taps, and real numbers for other filter taps. The filter can be provided with adaptation step sizes different from filter tap to filter tap. The filter can also be provided with an adaptation step size(s) varying over time. The filter can also be provided with an adaptation step size(s) divided by the square norm of the compensated signal.07-12-2012
20080219384Tfci Decoding Apparatus and Method - Wireless communication systems according to 3rd Generation standards allow for large flexibility in payload transmission. To signal the specific combination of transport block sizes multiplexed into one composite transport channel, a transport format combination indicator is transmitted in addition to the encoded payload data. The correct decoding of this transport format combination indicator codeword information is crucial to retrieve the correct number and size of transport blocks from the incoming data stream in the receiver, which can be both, the user equipment or the base station. The decoding apparatus (09-11-2008
20100008450DEMODULATION USING BLIND CONSTELLATION IDENTIFICATION FOR COMMUNICATION SIGNALS - A receiver and a method to demodulate an unknown signal with an unknown linear modulation is described. The method of one of various embodiments comprises: sampling the unknown signal at a sampling rate to produce a sampled signal; applying carrier frequency offset estimation to the sampled signal to match the frequency of the sampled signal to that of the unknown signal and to change constellation rotation of the sampled signal; utilizing symbol period estimation to match the sampling rate of the sampled signal to a sampling rate of the unknown signal; applying blind equalization to the sampled signal to provide an equalized unknown signal; and demodulating the equalized unknown signal by utilizing a multistep windowed histogram clustering algorithm to generate constellation clusters; applying a rotation rate estimation algorithm to the clusters to estimate a phase rotation rate; and utilizing the phase rotation rate estimate to de-rotate the clusters.01-14-2010
20120314817DATA RECEIVING DEVICE, SEMICONDUCTOR INTEGRATED CIRCUIT, AND METHOD FOR CONTROLLING DATA RECEIVING DEVICE - A data receiving device capable of reducing power consumption. A data receiving device according to the present invention has a receiving circuit and a power reduction circuit. The receiving circuit includes a receiver for receiving differential signals, a decode circuit, and a control circuit. The power reduction circuit puts the receiver into an on state in accordance with timing of a data reception start by the receiving circuit, and puts the receiver into an off state in accordance with timing of a data reception end by the receiving circuit. Further, the control circuit puts the power reduction circuit into an off state in accordance with the timing of the data reception start by the receiving circuit, and puts the power reduction circuit into an on state in accordance with the timing of the data reception end by the receiving circuit.12-13-2012
20120314818DIGITAL COMMUNICATIONS RECEIVER AND METHOD OF ESTIMATING RESIDUAL CARRIER FREQUENCY OFFSET IN A RECEIVED SIGNAL - A carrier frequency offset can be present in a signal received by a communications receiver, when the receiver has a local frequency oscillator that generates a carrier frequency different from a carrier frequency generated by a local frequency oscillator at a transmitter that transmitted the signal. A residual carrier frequency offset can remain after most of the carrier frequency offset has been removed from the received signal using conventional techniques. The residual carrier frequency offset is estimated using first and second channel impulse responses derived from first and second portions of the received signal. An estimated phase difference between the first and second channel impulse responses is computed. An estimate of the residual carrier frequency offset is computed using the estimated phase difference.12-13-2012
20120224659PILOT DESIGN FOR WIRELESS SYSTEM - The description herein relates to pilot designs for an Orthogonal Frequency Division Multiplexing (OFDM) based communication system. In the preferred embodiment, the communication system is one operating according to the IEEE 802.16m, or WiMax, standard. In general, an OFDM transmitter operates to insert pilot symbols into a resource of a transmit frame according to a predetermined staggered pilot symbol pattern defining pilot symbol locations within the resource of the transmit frame. The predetermined pilot symbol pattern is defined such that pilot symbols are located at or near time boundaries of the resource, at or near frequency boundaries of the resource, or both. By doing so, when generating a channel estimate for the communication channel between the OFDM transmitter and an OFDM receiver based on the pilot symbols, extrapolations needed to estimate the channel near the boundaries of the resource are optimized, thereby improving overall channel estimation accuracy.09-06-2012
20120224658GENERALIZED FREQUENCY MODULATION - A receiver may comprise a complex mixer for converting the modulated signal to a complex modulated signal comprising a first in-phase component and a first quadrature component. The receiver may further comprise a digital demodulator. The digital demodulator may comprise at least one processor circuit programmed for applying a phase differencer for generating an output function in terms of a phase difference of the complex modulated signal. Applying the phase differencer may comprise converting the first in-phase component to a function of a phase difference of the first in-phase component expressed in digital time, and converting the first quadrature component to a function of the phase difference of the first quadrature component expressed in digital time. The at least one processor circuit of the digital demodulator may also be programmed for applying a four quadrant inverse tangent to the output function to generate the information signal.09-06-2012
20120257693CDR WITH SIGMA-DELTA NOISE-SHAPED CONTROL - In described embodiments, a receiver includes a clock and data recovery (CDR) module with a voltage control oscillator (VCO) and a Sigma-Delta modulator in an integral loop control of the VCO. Providing finer resolution by the Sigma-Delta modulator reduces quantization noise in the integral control loop when compared to a loop without a Sigma-Delta modulator in the integral loop. Sigma-Delta modulation within the integral loop control of a VCO-based CDR reduces effective quantization of the VCO integral word control, allowing the proportional loop control compensation to i) reduce effective quantization of the VCO integral word control and, ii) enhance receiver jitter tolerance in presence of periodic-jitter, serial data whose frequency is offset from the nominal rate and serial data whose nominal frequency is modulated by a spread spectrum clock.10-11-2012
20120328056COMMUNICATION APPARATUS AND COMMUNICATION METHOD - A wireless communication apparatus and a wireless communication method wherein even when the permissible delay amount of data is small, the permissible delay thereof can be satisfied. A data type determining part (12-27-2012
20120082270METHOD AND SYSTEM FOR IMPLEMENTING A SINGLE WEIGHT (SW) SINGLE CHANNEL (SC) MIMO SYSTEM WITH NO INSERTION LOSS - In a RF communications system, aspects for implementing a single weight single channel MIMO system with no insertion loss may comprise generating at least one control signal that is utilized to control at least one of a plurality of received signals in a WCDMA and/or HSDPA system. A phase of a first of the plurality of received signals may be adjusted outside of a first processing path used to process that signal so that it is equivalent to a phase of at least a second of the plurality of received signals. A gain in the first processing path may be equivalent to a gain in a second processing path that is utilized to process the second of the plurality of received signals. The control signal may be utilized to adjust a phase and/or an amplitude of at least one of a plurality of received signals.04-05-2012
20120082269METHOD FOR CHANNEL ESTIMATION AND DELAY SPREAD APPROXIMATION IN A WIRELESS COMMUNICATION SYSTEM - A method for delay spread approximation used in a wireless communication system comprises the steps of: retrieving a plurality of pilot symbols from a channel of a wireless communication system; calculating at least one parameter representing the shape of the frequency response of the channel according to the values and the relative positions of the pilot symbols; determining a representative parameter value according to the at least one parameter; and determining a delay spread value according to the representative parameter value.04-05-2012
20120257695Network Coding Method and Device in Cooperative Communication - Embodiments of the present invention provide a network coding method and device in cooperative communication. The method, application and device relate to the field of wireless network communications. The method includes: receiving a signal sent from a first source node by using an OFDM symbol, and receiving a signal sent from a second source node by using an OFDM symbol; and performing a time reversal on one part of received mixed signals, and performing a reversal of a complex conjugate operation on the other part of the received mixed signals. The method, application and device have the advantage of obtaining a full diversity gain.10-11-2012
20120257694METHODS, CIRCUITS, SYSTEMS AND APPARATUS PROVIDING AUDIO SENSITIVITY ENHANCEMENT IN A WIRELESS RECEIVER, POWER MANAGEMENT AND OTHER PERFORMANCES - A wireless receiver (10-11-2012
20090016467Noncoherent symbol clock recovery subsystem - A symbol clock recovery subsystem uses a tap delay line having a set of delays, uses a clock bank of samplers providing time-staggered sampled noncoherently received signals, and uses a set of mean magnitude generators, in channelized form, for providing a set of mean magnitudes to a maximum selector for selecting a maximum one of the time-staggered sampled received signals having the greatest signal to noise ratio so as to provide a signal effectively occurring at symbol epoch time for demodulating a symbol stream in a digital communication system receiver.01-15-2009
20120230452WIRELESS RECEIVING APPARATUS - Disclosed is a wireless receiving apparatus, whereby inter-antenna interference can be reduced without inducing an increase of a mounting area due to an increase of the number of antennas, and the number of RFIC input terminals, circuit scale and power consumption can be reduced. In the wireless receiving apparatus (09-13-2012
20110122976METHOD AND SYSTEM FOR DETERMINING WHETHER A TRANSMITTED DATA SIGNAL COMPRISING A CYCLIC PREFIX IS PRESENT IN A RECEIVED SIGNAL - A method for determining whether a transmission signal comprising a cyclic prefix is present in a received signal is described which includes determining a plurality of received signal values from the received signal; forming a plurality of different pairs of the received signal values based on a predefined periodicity of the cyclic prefix; determining a correlation term value for each of the plurality of pairs of the received signal values; and determining whether a data signal is present in the received signal based on a combination of the correlation term values.05-26-2011
20120230451DC OFFSET ESTIMATION DEVICE AND DC OFFSET ESTIMATION METHOD - A direct current (DC) offset estimation device includes a determining circuit and an estimation circuit. The determining circuit is arranged for comparing a plurality of bits of an access code in a packet with a first predetermined value, respectively, and accordingly generating a determining result. The estimation circuit is coupled to the determining circuit, for estimating a DC offset according to the determining result.09-13-2012
20080298512DATA PROCESSING APPARATUS - A data processing apparatus includes a channel demultiplexing circuit, a bus, a memory controller and a memory. The channel demultiplexing circuit has a first delay circuit which delays first channel data only of multi-channel data by one cycle and outputs first delayed channel data, a second delay circuit which delays second channel data only of the multi-channel data by one cycle and outputs second delayed channel data, and a channel data holding circuit which stores first coupled data obtained by coupling the first channel data and the first delayed channel data for multiple cycles and stores second coupled data obtained by coupling the second channel data and an output of the second delay circuit for multiple cycles. The channel demultiplexing circuit selectively outputs a first channel data group and a second channel data group to the bus.12-04-2008
20080298511Soft-Output Demodulation Apparatus and Method - Provided is a soft-output demodulation apparatus and method having a relatively low complexity and capable of acquiring a channel reliability value to be inputted to an iterative decoder, in a digital communication system. The apparatus includes: a storage unit for pre-determining and storing opposite-bit nearest constellation points corresponding to constellation points by dividing a constellation point region according to a modulation scheme; a quantizer for quantizing a channel reception signal; a region decider for deciding the nearest constellation point corresponding to the quantized channel reception signal; a reverse constellation point detector for detecting an opposite-bit nearest constellation point corresponding to the decided nearest constellation point from the values pre-stored in the storage unit; and a soft-output demodulation value calculator for calculating a soft-output demodulation value based on the nearest constellation point, the nearest constellation point of the opposite bit, and the channel reception signal.12-04-2008
20090196378POST CORRELATION SYSTEM FOR GNSS RECEIVER - A post correlation system for a GNSS receiver uses an FFT engine to perform post-FFT operation to obtain spectrum data. The system has a contender selector for sieving magnitude results of the spectrum data meeting some specific conditions for selected hypotheses. The sieved magnitudes results rather than all the magnitude results are stored into a memory. By doing so, the requirement of the memory capacity can be significantly reduced.08-06-2009
20120263260Highly Optimized Digital IQ Transmitter Chain - Circuitry separates a modulation signal into digital sign and magnitude signal components. The digital magnitude signal is converted to an analog magnitude signal. The analog magnitude signal is the mixed with an in-phase or quadrature carrier signal under the influence of the digital sign signal and routed to a driver output stage.10-18-2012
20120263259BEARING DETERMINATION USING SIGNALS TRANSFORMED INTO FREQUENCY DOMAIN - An apparatus, a method and a computer program for determining a bearing. The apparatus may comprise: a first transformer configured to transform a first signal formed from a set of multiple orthogonal subcarriers and received via a first path, from a time domain to a frequency domain and produce for each of a plurality of the multiple orthogonal subcarriers a respective first coefficient; a second transformer configured to transform a second signal formed from the set of multiple orthogonal subcarriers and received via a second path, different from the first path, from a time domain to a frequency domain and produce for each of a plurality of the multiple orthogonal subcarriers a respective second coefficient; and processing circuitry configured to process the plurality of first coefficients and the plurality of second coefficients to determine a bearing for the apparatus.10-18-2012
20110002420METHOD AND SYSTEM FOR DECODING SINGLE ANTENNA INTERFERENCE CANCELLATION (SAIC) AND REDUNDANCY PROCESSING ADAPTATION USING BURST PROCESS - Aspects of a method and system for decoding single antenna interference cancellation (SAIC) and redundancy processing adaptation using burst process are provided. A wireless receiver may decode bit sequences based on a first decoding algorithm that may utilize redundancy in the data and that may impose physical constraints. The receiver may also decode a received bit sequence based on a second decoding algorithm that utilizes SAIC. Received data may be processed in a burst process portion in either decoding algorithm. Burst processed data from one of the decoding algorithms may be selected based on signal-to-noise ratio and/or received signal level measurements. The selected burst processed data may be communicated to a frame processing portion of the corresponding decoding algorithm.01-06-2011
20110002419Low Power Digital Media Broadcast Receiver with Time Division - Systems and methods for providing a low power receiver device using fine grained time division are provided. In one embodiment, the receiver device comprises a tuner, a demodulator configured to demodulate at least one sampled signal, a payload processor configured to process at least one demodulated signal into an output format, and a time division control logic configured to generate a control signal to switch at least one component within the receiver device between modes to conserve power. The at least one component may be switched between an active mode, a standby mode, a power off mode, and a low power mode. In further embodiments, the at least one component may be switched between staggered modes.01-06-2011
20110002418TIME -FREQUENCY SYNCHRONIZATION AND FRAME NUMBER DETECTION FOR DMB-T SYSTEMS - A DMB-T receiver supports a single carrier (SC) form of modulation and a multi-carrier form of modulation such as orthogonal frequency division multiplexing (OFDM). Upon receiving a broadcast signal, the DMB-T receiver downconverts the received broadcast signal to a received base-band signal and determines a frame number for each frame by correlating groups of the received symbols in adjacent signal frames. In particular, the receiver determines a maximum right-shift correlation value and a maximum left-shift correlation value. If the magnitude of the maximum right-shift correlation value is greater than, or equal to, the magnitude of the maximum left-shift correlation value, then the maximum right shift correlation value is used to retrieve a frame number from a look-up table. Otherwise, the negative value of the maximum left-shift correlation value is used to retrieve a frame number from the look-up table.01-06-2011
20120236970System and Method for Signaling and Detecting in Wireless Communications Systems - A system and method for signaling and detecting in wireless communications systems are provided. A method for processing information includes operating in a first phase, operating in a second phase, and processing the detected information. The first phase includes iteratively inverting a first filtering operation on received signals, and the second phase includes iteratively inverting a second filtering operation on received signals with consideration given to a first estimation error of symbols of the first user and a second estimation error of symbols of the second user.09-20-2012
20110038441TRANSMISSION MODE DETECTION - A method of detecting if a transmitted signal was transmitted in a particular transmission mode, the method comprising receiving a signal in primary and secondary frequency bands and comparing a first part of a header of the signal in the primary frequency band with a corresponding first part of a header of the signal in the secondary frequency band.02-17-2011
20120093265Decoding of Forward Error Correction Codes in the Presence of Phase Noise - A communication receiver includes a front end, which is arranged to receive a Radio Frequency (RF) signal, which includes modulated symbols carrying data that have been encoded by a block Forward Error Correction (FEC) code. The front end converts the RF signal to a sequence of soft received symbols, wherein the soft received symbols are subject to distortion by at least first and second noise components having respective at least first and second statistical distributions. A metric calculation unit is arranged to process the soft received symbols so as to extract parameters indicative of the at least first and second statistical distributions, and to compute FEC metrics based on the extracted parameters. A FEC decoder is arranged to accept the FEC metrics as input, and to process the metrics in an iterative FEC decoding process so as to decode the FEC code and reconstruct the data.04-19-2012
20110235756SIGNAL LOSS DETECTOR FOR HIGH-SPEED SERIAL INTERFACE OF A PROGRAMMABLE LOGIC DEVICE - A loss-of-signal detector includes digital and analog monitoring of incoming data. The incoming signal is compared digitally to at least one predetermined pattern that may indicate a loss of signal, and also is monitored by an analog detector that detects transitions in the data. If the digital comparison fails to match any of the at least one predetermined pattern, or if transitions are detected by the analog monitoring, even if the digital comparison produces a pattern match, then loss of signal is not indicated.09-29-2011
20110235754METHOD AND A DEVICE FOR DETERMINING IF AN INFORMATION WORD TRANSFERRED BY AT LEAST A SOURCE HAS TO BE RELAYED - The present invention concerns a method for determining if an information word transferred by a source has to be relayed by a telecommunication device. The signals transferred by the source are composed of complex symbols obtained from the information word. The telecommunication device: 09-29-2011
20110235753WIRELESS COMMUNICATION DEVICE AND WIRELESS COMMUNICATION METHOD - According to one embodiment, a wireless communication device includes a receiver, a physical layer processor, a MAC layer controller, and a channel setting unit. The receiver receives wireless signals received by using a plurality of communication channels as a baseband signal. The physical layer processor processes a physical layer of the baseband signal. The MAC layer controller recognizes a first frequency band used by a first communication channel, and determines whether a second frequency band is adjacent to the first frequency band or not. The channel setting unit supplies the first frequency band to the receiver, and controls the physical layer processor depending on information as to whether the first frequency band is adjacent to the second frequency band or not.09-29-2011
20120321021OFDM RECEPTION DEVICE, OFDM RECEPTION CIRCUIT, OFDM RECEPTION METHOD, AND OFDM RECEPTION PROGRAM - An OFDM reception device A comprises: a first orthogonal transformation unit A12-20-2012
20120321022METHOD AND APPARATUS FOR DETECTING A PLURALITY OF SYMBOL BLOCKS USING A DECODER - Teachings presented herein offer a technique for using a demodulator to improve a demodulation process. For example, a demodulation unit according to an embodiment of the present invention may be a multi-stage demodulator and may include: a demodulator configured to receive a baseband signal and configured to produce modem bit likelihood values based on the received baseband signal; a decoder configured to receive and process the modem bit likelihood values to produce improved modem bit likelihood values; a candidate value generator configured to produce, based on the improved modem bit likelihood values, candidate symbol values for a group of one or more symbols; and a detector configured to receive the baseband signal and the candidate symbol values and configured to produce one of (a) final modem bit estimates and (b) candidate symbol values for a group of symbols.12-20-2012
20100195773MUTLIPHASE CODE GENERATOR AND GNSS RECEIVER - A code generator, for providing a PRN sequence in a GNSS receiver, has the capability to store an internal status at any given point of the generated sequence. The stored status can be reloaded in the generator, upon an external command, or after a given number of generation cycles, thus slewing the phase of the generated PRN sequence to the value corresponding to the stored status. A parallel-correlation GNSS receiver includes one or more slewable code generators, for successively generating local replicas of GNSS PRN sequences, having different code phases, corresponding to a plurality of candidate signals of different code and Doppler shifts. Each time the code generator must switch from one candidate to a second, it is preemptively controlled or programmed, while generating the code for the first candidate, to store the internal status at the phase point almost aligned with the start of the PRN sequence for the second candidate. When the correlation engine switches from the first candidate to the second one, the stored status is loaded in the code generator, and the small misalignment between the code generator and the desired sequence is corrected, thus setting it at the needed point in phase space. The generator and receiver of the invention are well suited to the search of several GNSS signal in parallel, and require less memory than a table-based code generator.08-05-2010
20120087446Systems and methods for sparse error removal in communications systems - A method for robust demodulation of the communications system in presence of sparse severe impulse noise is presented. In this invention, the application of impulse noise removal in orthogonal frequency domain multiplexing systems is investigated. The impulse noise causes catastrophic accuracy degradation at the output of the fast Fourier transform operations at the receiver. In this invention, an impulse noise identification scheme is proposed to determine the presence of the impulse noise. An impulse noise value search algorithm at known location based on the steepest descent method, an impulse noise location algorithm, and a novel iterative impulse error correction scheme are presented to remove the sparse error and demodulate the transmitted symbols accurately.04-12-2012
20120328054RECEIVER AND SIGNAL RECEIVING METHOD THEREOF - A signal receiving method of a receiver includes the following steps. A time-domain received signal is transformed into a frequency-domain received signal, which includes multiple pilot symbols and multiple data symbols. Multiple channel impulse responses corresponding to the pilot symbols are estimated. Multiple inter-carrier interference and inter-block interference (ICIIBI) values corresponding to the pilot symbols are estimated based on the pilot symbols and the corresponding channel impulse responses. Multiple ICIIBI values corresponding to the data symbols are obtained via an interpolation operation according to the ICIIBI values corresponding to the pilot symbols. The estimated corresponding ICIIBI values are cancelled from the data symbols. The interference-cancelled data symbols are demapped to obtain soft-decision or hard-decision bits.12-27-2012
20120328055CHANNEL ESTIMATION CIRCUIT, CHANNEL ESTIMATION METHOD, AND RECEIVER - Disclosed is a channel estimation circuit that estimates a channel state of each sub-carrier, transforms the estimated channel state information into a time-domain complex delay profile, suppresses a noise by way of processing the complex delay profile, and transforms the complex delay profile into a frequency domain. The channel estimation circuit makes a judgment on the estimated channel state and carries out masking on a part of the complex delay profile in accordance with the judgment for suppressing the noise.12-27-2012
20100208850SYNCHRONIZING INITIALIZATION DATA TO TIME BURSTS IN A MOBILE COMMUNICATIONS SYSTEM - An apparatus encodes a signal for providing an MPEG-2 encoded signal having associated initialization data such as I-frames; and transmits the signal, wherein the transmitted signal occurs in bursts for conveying the MPEG-2 encoded signal, wherein each burst has a duration and occurs in a time slicing cycle, each time slicing cycle comprising at least the burst duration and an off-time, and wherein at least one I-frame is conveyed in a burst and repeated in every following burst until a new I-frame is received for transmission.08-19-2010
20120288034METHOD AND SYSTEM FOR PERFORMING COMPLEX SAMPLING OF SIGNALS BY USING TWO OR MORE SAMPLING CHANNELS AND FOR CALCULATING TIME DELAYS BETWEEN THESE CHANNELS - A method and system for performing complex sampling of signals by using two or more sampling channels and for calculating time delays between these channels. According to certain embodiments of the presently disclosed subject matter, the system and method are operable to enable a complex sampling of a signal in a frequency-domain by means of a predefined-order sampling, including utilizing a sampling channel for converting an analog signal to a corresponding substantially non-delayed digital signal; and transforming the digital signal to a plurality of corresponding frequency-domain substantially non-delayed discrete components; providing one or more additional sampling channels enabling to perform a predefined-order sampling, the predefined-order depending on a number of the one or more additional sampling channels, each additional sampling channel configured to perform a number of stage, giving rise to the multiplied frequency-domain delayed discrete components; and combining the multiplied frequency-domain delayed discrete components with the corresponding frequency-domain substantially non-delayed discrete components, giving rise to an output frequency-domain complex signal.11-15-2012
20100202570Method for estimating phase error in MIMO OFDM communications system - A method for estimating a phase error existing in a receiver of a MIMO OFDM communications system is disclosed. The method includes executing Hermitian transpose on channel coefficient matrix of the MIMO OFDM communications system for generating Hermitian-transposed channel coefficient matrix, multiplying received signal matrix of the receiver with the Hermitian-transposed channel coefficient matrix for generating converted signals, summing products of the converted signals and complex conjugates of pilot signals corresponding to the converted signals for generating a sum result, and generating the phase error according to the sum result, the converted signals, and the complex conjugates of the pilot signals. The pilot signals are extracted from the received signal matrix.08-12-2010
20100202569RADIO RECEIVER - A radio receiver which is capable of improving the power consumption efficiency in the analog/digital conversion process. On a radio receiver (08-12-2010
20100202568RECEIVER - Provided is a receiver including a receiving unit, a demodulator-decoder unit, a synchronization detecting unit, and an output control unit. The receiving unit receives digital broadcasting. The demodulator-decoder unit obtains an output including a transport stream through a demodulating processing and a decoding processing performed on a reception signal received by the receiving unit. The synchronization detecting unit secures synchronization on the basis of the reception signal received by the receiving unit, and generates a timing signal to be used in the demodulating processing and in the decoding processing. The output control unit outputs the output including the transport stream from the demodulator-decoder unit if the synchronization is secured. The output control unit fixes a logic level of the output including the transport stream if the synchronization is not secured.08-12-2010
20090022248Method for Demodulating the Signal of Multiple-Position Frequency Manipulation with Equidistant Frequency Spreading, Demodulator for this Signal, and Computer-Readable Medium - This invention relates to signal transmitting engineering. The use of the inventive method demodulation of a signal of multiple position frequency manipulation with equidistant frequency spreading allows to reduce the threshold of demodulation and to ensure a quality of demodulation, which is at least identical to that of a quasi-optimal demodulator. To obtain such a result, a frequency grid is formed with a possibility of precise tuning of frequency spreading; during the reception, values having a maximum module of reception signal are extracted at all frequencies switchable values at clock frequency, this clock frequency is extracted from maximum of the received signals and is used for a precise tuning of the frequency spreading; a grid of tunable frequency is tuned with a precisely tuned frequency spreading for exact values of a frequency of received signal, and demodulation is effected by the way of coherent reception of the received signal, using only one from quadrature signals to decide whether a signal of a determined frequency is absent or present among the mentioned exact values of frequency.01-22-2009
20130010900SYSTEM AND METHOD FOR MIMO DECODING - A method, a system, a wireless device and a computer program product are provided. A process for decoding transmitted symbols in MIMO systems is provided. The received point coordinates and estimated candidate coordinates are represented by a reduced bit representation naturally dividing each dimension into uniformly sized bit segments. A bounded region surrounding the received point is defined in the total number of dimensions, the bounded region being a hypercube. For each candidate, an elimination process is carried out including: determining a position of the candidate to be inside or outside the bounded region, eliminating the candidate if it is outside, storing it if it is inside, adding a further bit thereby reducing a size of the bounding region; repeating the elimination process for the candidates stored as potential solutions until a single solution is obtained; determining the transmitted symbols from the single solution found.01-10-2013
20130010903Method and System for Diversity and Mask Matching in Channel Estimation in OFDM Communication Networks Using Circular Convolution - A mobile device in an OFDM system receives an OFDM signal comprising RS tones and data OFDM symbols. The received RS tones are extracted for channel estimation using a masking operation. Masking parameters are determined by matching channel time variance using corresponding time domain samples of the extracted RS tones. As approximated channel impulse responses of transmission channels, the time samples are masked to perform the channel estimation. The channel time variance comprising inter-carrier interference and delay spread are measured, respectively. A mean of differences in power between neighbor adjacent subcarriers of the extracted RS tones is used for the inter-carrier interference measurement. The delay spread measurement such as root-mean-squared (RMS) delay spread is calculated using the approximated channel impulse responses. Masking parameters are determined based on the inter-carrier measurement and the RMS-DS measurement for generating channel estimates by masking the approximated channel impulse responses.01-10-2013
20130010902RADIO RECEIVER, RADIO COMMUNICATION SYSTEM, RADIO COMMUNICATION METHOD, AND PROGRAM - A radio receiver including a sampling unit, a provider, an arithmetic operation unit, an estimator, and a converter. The sampling unit samples a baseband signal transmitted from the radio transmitter, at a fractional multiple of a symbol rate, and generates fractional-multiple-sampling data. The provider provides reference data in which the known symbol sequence arranged in a frame by the radio transmitter is interpolated at a rate of the fractional multiple. The arithmetic operation unit performs an arithmetic operation for evaluation data in which the degree of consistency in waveform between the fractional-multiple-sampling data and the reference data is evaluated. The estimator estimates a reference timing from a shift amount at which the evaluation data shows the maximum degree of consistency in waveform. The converter converts the fractional-multiple-sampling data by using the reference timing as a reference thereby recovering the data having the symbol rate.01-10-2013
20130010901Method and System for Decoding Single Antenna Interference Cancellation (SAIC) and Redundancy Processing Adaptation Using Burst Process - Aspects of a method and system for decoding single antenna interference cancellation (SAIC) and redundancy processing adaptation using burst process are provided. A wireless receiver may decode bit sequences based on a first decoding algorithm that may utilize redundancy in the data and that may impose physical constraints. The receiver may also decode a received bit sequence based on a second decoding algorithm that utilizes SAIC. Received data may be processed in a burst process portion in either decoding algorithm. Burst processed data from one of the decoding algorithms may be selected based on signal-to-noise ratio and/or received signal level measurements. The selected burst processed data may be communicated to a frame processing portion of the corresponding decoding algorithm.01-10-2013
20130010904SYSTEM AND METHOD PERFORMING QUADRATURE AMPLITUDE MODULATION BY COMBINING CO-SETS AND STRONGLY CODED CO-SET IDENTIFIERS - A method of encoding a stream of data elements is provided which involves splitting the stream of data elements into a first stream and a second stream; encoding the first stream to produce a first encoded stream; performing a constellation mapping using a combination of the first encoded stream and a third stream which is based on the second stream. This may involve defining a signal constellation; defining a plurality of co-sets within the constellation such that a minimum distance between constellation points within each co-set is larger than a minimum distance between any constellation points within the signal constellation; performing said constellation mapping by using the first encoded stream to identify a sequence of co-sets of said plurality of co-sets, and by using the third stream to identify a sequence of constellation points within respective co-sets of the sequence of co-sets identified by said first encoded stream.01-10-2013
20100150279SIGNAL DETECTION IN MULTIPLE-INPUT-MULTIPLE-OUTPUT COMMUNICATION SYSTEM - Methods and apparatuses for detecting signals in a MIMO communication system include receiving symbols coded into pairs using a space-time code. Estimating a channel matrix that identifies the response between multiple transmit and receive antennas in the MIMO communication system. Performing a QR factorization on the channel matrix to obtain Q and R matrices. Determining a receive vector corresponding to a plurality of transmitted symbols received by the multiple receive antennas and transforming the receive vector based upon the Q matrix. Estimating a value of at least two received symbols to determine at least two estimated symbols. Then removing a contribution of the estimated symbols from the receive vector to determine a revised received vector. Estimating a value of at least two additional received symbols to determine at least two additional estimated symbols.06-17-2010
20100150274Method and System for Determining a Signal Vector - A method for determining a signal vector comprising a plurality of components from a received signal vector is provided comprising performing a QR decomposition of a channel matrix characterizing the communication channel via which the signal vector was received and being expanded by variance information about the noise on the communication channel carrying out a plurality of determination steps using the QR decomposition of the expanded channel matrix, wherein in each step a set of possible sub-vectors of the signal vector is determined and wherein in each step, the number of possible sub-vectors in the set is lower than a predefined maximum number, and selecting one vector of the set of possible sub-vectors determined in the last step of the plurality of determination steps as the signal vector.06-17-2010
20130016798ADAPTIVE DIGITAL RECEIVER - The present invention provides a high-performance adaptive digital receiver with adaptive background control that optimizes the performance in rapidly changing signal environments and provides 3.6 GH; instantaneous bandwidth, SFDR>90 dB, SNR=66 dB, with dynamic digital channelization. The receiver takes advantage of several levels of adaptivity that conventional approaches do not offer. In addition to a dynamic digital channelizer that is adaptively tuned based on detected signals, the present invention employs a powerful software reconfigurable digitizer that is adaptively optimized for the current signal environment to control important receiver parameters such as bandwidth, dynamic range, resolution, and sensitivity.01-17-2013
20100172446FREQUENCY DRIFT ESTIMATION FOR LOW COST OUTDOOR UNIT FREQUENCY CONVERSIONS AND SYSTEM DIAGNOSTICS - Systems and devices for controlling frequency drift in satellite broadcast systems. A receiver antenna system for a direct broadcast satellite signal communications system in accordance with one or more embodiments of the present invention comprises an oscillator, a mixer, coupled to the oscillator, for converting satellite signals at a first frequency to signals at an intermediate frequency, an analog-to-digital (A/D) converter, coupled to the mixer, for receiving the signals at the intermediate frequency and for converting the signals at the intermediate frequency at near-real-time to a digital data stream, a Digital Signal Processor (DSP), coupled to the A/D converter, for processing the digital data stream, and a drift estimator, coupled to the DSP, the drift estimator determining a frequency drift of the oscillator, wherein the receiver antenna system corrects the frequency drift of the oscillator using the determined frequency drift.07-08-2010
20110158356Apparatus and Method for Determining Signal Power - An apparatus for determining signal power comprise an oscillating circuit and a determining circuit. The oscillating circuit generates an oscillating signal. When a to-be-detected signal has signal power greater than a threshold, the oscillating signal has a first frequency; when the signal power is smaller than the threshold, the oscillating signal has a second frequency. The determining circuit determines whether the oscillating signal has either the first frequency or the second frequency, and generates a determination result accordingly.06-30-2011
20110158355RECEPTION APPARATUS, RECEPTION METHOD, PROGRAM, AND RECEPTION SYSTEM - A reception apparatus is disclosed which includes: a reception section configured to receive an orthogonal frequency division multiplexing signal known as an OFDM signal formed by modulating common packet sequences and data packet sequences, the common packet sequences being made up of packets common to a plurality of streams, the data packet sequences being constituted by packets unique to each of the plurality of streams; an acquisition section configured to acquire decoding information for decoding the original streams from the common packet sequences and the data packet sequences obtained by demodulating the received OFDM signal; and a search section configured to search for the common packet sequence needed to decode the original streams from the designated data packet sequence on the basis of the acquired decoding information.06-30-2011
20110158354RECEIVER, RECEIVING METHOD, PROGRAM AND RECEIVING SYSTEM - Disclosed herein is a receiver including a receiving section, a first sorting section, a second sorting section, and a switching section.06-30-2011
20120243643APPARATUS AND METHOD OF DIFFERENTIAL IQ FREQUENCY UP-CONVERSION - A balanced transmitter up-converts I and Q baseband signals directly from baseband-to-RF. The up-conversion process is sufficiently linear that no IF processing is required, even in communications applications that have stringent requirements on spectral growth. In operation, the balanced modulator sub-harmonically samples the I and Q baseband signals in a balanced and differential manner, resulting in harmonically rich signal. The harmonically rich signal contains multiple harmonic images that repeat at multiples of the sampling frequency, where each harmonic contains necessary information to reconstruct the I and Q baseband signals. The differential sampling is performed according to control signals that are phase shifted with respect to each other. The control signals may have pulse widths (or apertures) that operate to improve energy transfer to a desired harmonic in the harmonically rich signal. A bandpass filter can then be utilized to select the desired harmonic of interest from the harmonically rich signal.09-27-2012
20080240302Communication System with Receivers Employing Generalized Two-Stage Data Estimation - A wireless transmit/receive unit (WTRU) is configure to receive and sample wireless signals in a shared spectrum where the wireless signal comprise encoded symbols. The WTRU has a channel estimation device configured to process received signal samples to produce an estimate of a channel response of the received signals corresponding to a matrix H. The channel estimation device is preferably configured to process the received signal samples to produce an estimate of noise variance of the received signals. The WTRU preferably has a two stage data estimator that includes a channel equalizer and a despreader. The channel equalizer is configured to process received signal samples using the estimated channel response matrix H and the estimate of noise variance to produce a spread signal estimate of the received signals. The despreader is configured to process the spread signal estimate of the received signals produced by said channel equalizer to recover encoded symbols of the received signals.10-02-2008
20080240301ARCHITECTURES FOR UNIVERSAL OR SOFTWARE RADIO - A system and technique for providing to flexible, programmable frequency estimators and spectrum analyzers that can operate over extremely large bandwidths and yet provide high spectral resolution are described. The acquisition time and hardware complexity of one technique scale as O(N), where N denotes the number of frequency bins acquired. Embodiments are disclosed in which architectures are implemented using exponentially-tapered transmission lines and filter cascades.10-02-2008
20080232513APPARATUS AND METHOD FOR PREAMBLE DETECTION AND INTEGER CARRIER FREQUENCY OFFSET ESTIMATION - This invention provides an apparatus and method for preamble detection and integer carrier frequency offset estimation, which method comprises the steps of: determining the window of useful subcarriers in preamble transformed to frequency domain based on pre-determined possible integer carrier frequency offset and the length of the preamble, so as to select the useful subcarriers; extracting a plurality of subcarrier sequences having a length equal to that of the preamble from the useful subcarriers; calculating conjugative multiplications of each subcarrier and its neighboring subcarriers in the subcarrier sequences extracted; acquiring the real part of the conjugative multiplications; calculating the cross correlations between the real part of the conjugative multiplications and known preambles modulated by DBPSK, and outputting the calculated correlation values; and detecting preamble index of a target base station with the calculated correlation values to select a target cell, and estimating integer carrier frequency offset with respect to the target base station.09-25-2008
20100027717Equalization of OFDM Signals Based on Time and Then Frequency Interpolation - Two dimensional interpolation techniques are used to compensate for time-varying channel gain H in an OFDM system. The channel gain can be reasonably estimated at various times and at various frequencies due, for example, to the use of pilot tones. These channel estimates are used to estimate the channel gain at other times and/or frequencies by two-dimensional interpolation, interpolating first with respect to time (e.g., with respect to a symbol index s) and then with respect to frequency (e.g., with respect to a sub-carrier index c).02-04-2010
20100086083RECEIVING APPARATUS AND RECEIVING METHOD - It is an object of the present invention to reduce deterioration of the receiving performance due to the inter-carrier interference after a discrete Fourier transform in a receiving apparatus with an OFDM signal. A frequency transform part transforms a frequency of a received signal to a desired frequency. A time axis data expansion part extracts at least K+N pieces of data corresponding to one symbol including a guard interval from output of the frequency transform part to generate 2N pieces of data by adding zero before and after the extracted data. A window shaping part shapes a waveform by multiplying output of the time axis data expansion part by a window coefficient, and a discrete Fourier transform part performs a discrete Fourier transform with respect to output of the window shaping part. A demodulation part performs a demodulation of a sub-carrier by extracting a sub-carrier component. An inter-carrier interference component calculation part calculates an inter-carrier interference component from output of the discrete Fourier transform part. A window coefficient generation part selects a window coefficient on the basis of output of the inter-carrier interference component calculation part to output to the window shaping part.04-08-2010
20080225993HYBRID PILOT CONFIGURATION - Systems and methodologies are described that facilitate employing a hybrid pilot configuration in a wireless communications network. A hybrid pilot configuration includes common pilot symbols and dedicated pilots multiplexed together within a time transmission interval. The multiplexed pilot symbols can be received and utilized to demodulate channels. Common pilot symbols can be employed to demodulate control channels and dedicated pilot symbols can be utilized to demodulate data channels. Moreover, the dedicated pilot symbols can be employed to generate a channel estimate. The common pilot channels can be utilized in combination with the dedicated pilot symbols to augment the channel estimate.09-18-2008
20080225992Device and method for determining a symbol during reception of a signal coupled with a quadrature signal pair (I,Q) for QAM frequency control and/or rotation control - The invention relates to a device and a method for determining a symbol during reception of a signal coupled with a quadrature signal pair having a discriminator for the determination of a symbol with an analysis of a received signal in complex coordinate space, and a control loop for QAM frequency control and/or rotation control while control parameters are used, which are constructed and/or controlled depending on at least one of the symbols to be decided by the discriminator so that the control parameters are adjusted for decisions to be taken later, wherein one weighting device is constructed and/or controlled, providing in each case one weighting value for the symbols to be decided and/or decided by the discriminator among a plurality of weighting values depending on the symbol position in the complex coordinate space for the control loop.09-18-2008
20080225991Method for searching pilot signals to synchronize a CDMA receiver with an associated transmitter - A method for synchronizing a CDMA receiver to a transmitter when an adaptive antenna is utilized to receive transmitted data, wherein a receiving antenna system is adapted between a 360° reception angle pattern (i.e., an omni-directional pattern) and a fixed reception angle (i.e., a directional pattern) by permitting the receiver to identify a pilot signal having the largest magnitude. The receiver minimizes interference from other pilot signals by steering antenna pattern nulls toward other transmitters. As a result, the time required for the receiver to acquire a valid pilot signal is significantly reduced.09-18-2008
20130142287RECEIVER WITH SELECTIVE SIGNAL PATH OPERATION AND ASSOCIATED METHODS - A receiver includes a first local oscillator, and an in-phase mixer and a quadrature mixer coupled to the first local oscillator and configured to generate in-phase and quadrature signals based upon received RF signals. A complex mixer is downstream from the in-phase and quadrature mixers. A controller is coupled to the in-phase and quadrature mixers and is configured to determine when the in-phase and quadrature signals include interference less than an interference threshold, and then powers off one of the in-phase and quadrature mixers.06-06-2013
20130142288Control Channel Detection - A wireless device at least demodulates, descrambles and decodes a first control signal to generate a first signal. The wireless device processes the first signal by at least encoding, scrambling, modulating and scaling the first signal. The wireless device subtracts the processed first signal from received signals to generate a second signal. The wireless device at least demodulates, descrambles and decodes the second signal to generate a second control message.06-06-2013
20130170587Systems and Methods for N-Dimensional Leaf-Node Prediction for MIMO Detection - Systems comprising a leaf node predictor for receiving a processed communications stream, determining at least one channel metric corresponding to the communications stream for a given channel realization, and generating at least three instructions to output, which at least one instruction corresponds to at least one predicted best leaf node candidate for the given channel realization.07-04-2013
20130170588ULTRA LOW POWER SUPER-REGENERATIVE RECEIVER AND METHOD THEREOF - An ultra low power super-regenerative receiver is provided. The ultra low power super-regenerative receiver includes a bit synchronizer configured to use a value sampled from a signal output from a super-regenerative oscillator to estimate a pulse-level position having a maximum amplitude value in a single period of a received symbol, a frame synchronizer configured to combine a plurality of pulse-level positions determined based on the estimated pulse-level position, and detect a predetermined bit sequence using the plurality of pulse-level positions combined, the frame synchronizer being configured to perform frame synchronization, and a data detector configured to detect data using the plurality of pulse-level positions determined after the frame synchronization is completed.07-04-2013
20130177107BANDPASS SAMPLING RECEIVER, AND METHOD FOR DESIGNING AND RECONSTRUCTING A FILTER THEREOF - Provided are a bandpass sampling receiver and a filter design and reconfiguration method thereof. The bandpass sampling receiver includes: an analog-digital converter converting an analog wireless signal into a digital baseband signal; and a complex baseband signal extraction unit generating a first path signal and a second path signal from the digital baseband signal and extracting a complex baseband signal using a relative sample delay difference between the first and second path signals, wherein the first path signal is a down sampled signal after the digital baseband signal is sample-delayed and the second path signal is a down sampled signal without sample-delaying the digital baseband signal.07-11-2013
20110274218DUAL POLARIZATION TRANSMISSION SYSTEM, DUAL POLARIZATION TRANSMISSION METHOD, RECEPTION APPARATUS, TRANSMISSION APPARATUS, RECEPTION METHOD, AND TRANSMISSION METHOD - A receiving device of a dual polarization transmission system includes: a receiver that receives an RF signal that is transmitted with the use of two orthogonal polarizations; two reception local oscillators that include PPL circuits to convert the received RF signal of each of the polarizations into an IF signal; and a demodulator that demodulates an IF signal of one polarization, which is obtained by the conversion, into a baseband signal. The reception local oscillators control a loop band of the PLL circuits in response to a signal from the demodulator.11-10-2011
20110274217METHOD AND SYSTEM FOR DEINTERLEAVING SIGNALS - There are provided method and system for deinterleaving signals. The method comprises: (a) recording plural signal reception events, wherein each signal reception event is associated with a received signal at a receiver, and represented by a space-time coordinate having a space component based on a location of the receiver and a time component based on an arrival time of the received signal; (b) selecting a subset of signal reception events from the recorded signal reception events, wherein the number of signal reception events in the subset is based on the dimension of the space component; and (c) determining whether the signal reception events in the selected subset satisfy a predetermined condition, and if the determination is in the affirmative, associating the signal reception events in the selected subset with an emission of an emitter.11-10-2011
20130136213RECEPTION SIGNAL PROCESSING DEVICE - A reception signal processing devices includes a converter which converts an analog signal amplified by an amplifying section to a digital signal, switches respectively provided in post-stages of variable gain amplifiers of the amplifying section, a bypass switch section which sets to open and close a path in which outputs of the variable gain amplifiers go around the variable gain amplifiers of the post-stages and are inputted to the converter, a switch controller which controls the switches and the bypass switch section and a DC offset controller which sets a correction value of a DC offset in accordance with a gain set to the variable gain amplifier as an object to be corrected.05-30-2013
20130094618COMMUNICATION SYSTEM UTILIZING A HIERARCHICALLY MODULATED SIGNAL AND METHOD THEREOF - A communication system utilizing a hierarchically modulated signal and method thereof are provided, wherein a receiver system is configured to receive a hierarchically modulated signal. The receiver system includes a receiver device configured to receive the hierarchically modulated signal, which is a function of a time domain, and including a high priority data stream that has a single carrier type modulation, and a low priority data stream having data bits that are spread over a plurality of data symbols of a high priority data modulation. The receiver system further includes a low priority processor device, which includes an OFDM decoder configured to convert the low priority data stream of the hierarchically modulated signal that is a function of the time domain to be a function of a frequency domain by utilizing a FFT, such that an output is emitted that is representative of the low priority data stream.04-18-2013
20130101072APPARATUS AND METHOD FOR EFFICIENT DIGITAL BROADCASTING BASED ON SINGLE FREQUENCY NETWORK - The present invention relates to an apparatus and method for simultaneous channel estimation in a digital broadcast system based on a single frequency network04-25-2013
20130114764Physical Layer Frame Format Design for Wideband Wireless Communications Systems - Systems and methods are provided for processing a payload portion of a received signal in a single carrier mode or a multiple carrier mode using a wireless channel receiver based on a portion of the received signal, where a signaling portion of the received signal is a single carrier signal. A single carrier signaling portion is received, and whether the payload portion of the signal is a single carrier signal or a multiple carrier signal is detected from the received single carrier signaling portion. The payload portion of the received signal is demodulated in a single carrier mode if the detecting determines that the payload portion of the received signal is a single carrier signal, and the payload portion of the received signal is demodulated in a multiple carrier mode if the detecting determines that the payload portion of the received signal is a multiple carrier signal. Data from the demodulated payload portion of the received signal is stored in a computer-readable memory.05-09-2013
20130136212DIGITAL BROADCAST RECEIVER - The present invention provides a digital broadcast receiver which reduces the time needed for channel scans by performing efficient channel scanning when broadcasts in a plurality of broadcast protocols are received. As a first phase channel scan, a first controller and a second controller divide a plurality of channels included in an overlapping frequency band of a first broadcast protocol and a second broadcast protocol, and execute parallel channel scans. After the first phase channel scan, the first controller scans channels in which electrical signals generated from electromagnetic waves received by a second tuner in the first phase channel scan could not be demodulated by a second demodulator, and the second controller scans channels in which electrical signals generated from electromagnetic waves received by a first tuner could not be demodulated by a first demodulator.05-30-2013
20130129021AUTOMATIC GAIN CONTROLLING DEVICE, ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING (OFDM) RECEIVER EMPLOYING HIGH-ORDER QUADRATURE AMPLITUDE MODULATION (QAM) AND USING AUTOMATIC GAIN CONTROLLING DEVICE, AND MANUFACTURING METHOD OF AUTOMATIC GAIN CONTROLLING DEVICE - Provided is an automatic gain controlling device that may prevent deterioration in performance of an orthogonal frequency division multiplexing (OFDM) receiver, on a cable network that performs communication by an orthogonal frequency division multiplexing (OFDM) scheme using high-order quadrature amplitude modulation (QAM), the automatic gain controlling device including a power computing unit to compute a power of a signal received by the OFDM receiver, and a gain controller to control a gain of the received signal based on the computed power of the received signal.05-23-2013
20130094616DIGITAL DOWN CONVERSION AND DEMODULATION - A method and apparatus for digital down conversion and demodulation of a radio frequency (RF) signal are disclosed. A sampling frequency for sampling the RF signal is chosen, based on a bandwidth and a safety margin, so that a bandwidth of the sampled signal falls substantially within a predetermined frequency zone. The sampled signal may be digitally demodulated at a demodulation frequency selected to be substantially equal to a baseband alias of a carrier frequency of the signal.04-18-2013
20080205558Method and Rfid Reader For Detecting a Delimiter Pattern in a Signal Stream - A method for detecting a delimiter pattern (SOF) in a signal stream containing a carrier or subcarrier modulated by the delimiter pattern comprises: specifying an expected delimiter occurrence time (t08-28-2008
20110222634COMMUNICATION SYSTEM UTILIZING A HIERARCHICALLY MODULATED SIGNAL AND METHOD THEREOF - A communication system utilizing a hierarchically modulated signal and method thereof are provided, wherein a receiver system is configured to receive a hierarchically modulated signal. The receiver system includes a receiver device configured to receive the hierarchically modulated signal, which is a function of a time domain, and including a high priority data stream that has a single carrier type modulation, and a low priority data stream having data bits that are spread over a plurality of data symbols of a high priority data modulation. The receiver system further includes a low priority processor device, which includes an OFDM decoder configured to convert the low priority data stream of the hierarchically modulated signal that is a function of the time domain to be a function of a frequency domain by utilizing a FFT, such that an output is emitted that is representative of the low priority data stream.09-15-2011
20080198952Equalising Structure And Method With Maximum Likelihood Detection - The present invention relates to an equalising structure (08-21-2008
20080198951DATA DEMODULATION METHOD AND APPARATUS - A data demodulation method and apparatus to prevent a decrease in a data demodulation rate. The data demodulation method includes detecting a frame sync signal from input data, arranging the input data on a predetermined unit basis based on a detected position of the frame sync signal, obtaining N pieces of predetermined unit data with respect to the predetermined unit data by shifting the predetermined unit data by a predetermined unit amount, demodulating the N pieces of predetermined unit data using a demodulation table, and selecting and outputting one of the N pieces of demodulated data as demodulated data of the predetermined unit data.08-21-2008
20100054372METHOD AND ARRANGEMENT FOR GENERATING SOFT BIT INFORMATION IN A RECEIVER OF A MULTIPLE ANTENNA SYSTEM - The invention which relates to a method and to an arrangement for generating soft bit information in a receiver of a multiple antenna system is based on the object of reducing the calculation complexity for generating the soft bit information. In terms of the method, the object is achieved by virtue of the fact that the iterative deepening search for the Mh antenna is carried out in two substeps, in which case, in the first substep, when the last element of s is not assigned to the mth antenna, s is rotated in such a manner that m is associated with the last element of s, that the channel matrix H is likewise rotated and QR decomposition of the channel matrix H is carried out, that, in the second substep, the iterative deepening search is carried out using a search radius in the form of a vector (Formula (I)); in which (Formula (II)) denotes the number of bit positions in the mth antenna, that the comparison (Formula (III))≧d03-04-2010
20130148762CIRCUIT AND METHOD FOR REMOVING FREQUENCY OFFSET, AND COMMUNICATION APPARATUS - A circuit and a method for removing a frequency offset and a communication apparatus including the circuit, capable of removing the frequency offset by tracking rapidly and accurately in a payload section. A sequence of sample levels is obtained by sampling a frequency level of the baseband signal at every 0.5 symbol interval. Absolute values of differences between the frequency levels adjacent to each other at every 1 symbol are calculated as first difference absolute values. Absolute values of differences between the frequency levels adjacent to each other at every 1 symbol are calculated as second difference absolute values. When the first difference absolute values are greater than a predetermined first determination value or the second difference absolute values are less than a predetermined second determination value, the average value calculated is set as the frequency offset.06-13-2013
20130148763SYSTEMS AND METHODS FOR ADAPTIVE SAMPLE QUANTIZATION - One embodiment includes an adaptive sample quantization system. The adaptive sample quantization system includes an antenna to receive a radio frequency (RF) signal having data encoded therein, and analog antenna electronics configured to convert the RF signal to an analog electrical signal. The system also includes an analog-to-digital converter (ADC) directly coupled to the antenna and configured to generate a plurality of consecutive digital samples of the RF signal. The system further includes a quantizer to determine a mode based on the plurality of consecutive digital samples and to select at least one threshold based on the determined mode. The quantizer can further compare each digital sample with the at least one threshold to generate a corresponding one of a plurality of output samples having a reduced number of bits relative to the respective digital sample to substantially mitigate potential interference and facilitate extraction of the data.06-13-2013
20130148764SYSTEM AND METHOD FOR ASK OFDM TRANSMISSION AND RECEPTION - An OFDM system and method using amplitude shift keying (ASK) for subcarrier modulation is provided. Because ASK is used, the signal of each symbol in time domain is conjugate-symmetric. In addition, among the discrete numbers of each symbol, two of them are always real. These properties are utilized such that only half of the numbers of each symbol sequence are transmitted. The generated baseband signal can be a complex or a real signal. As a result, the bandwidth efficiency of the derived ASK-OFDM is the same as that of QAM-OFDM.06-13-2013
20120275547Iterative demapper - Demodulation and/or demapping of a signal (e.g., based on a constellation whose points have a corresponding mapping with associated labels) is performed such that each dimension is processed separately without accounting for influences from the other dimension. For example, the demapping process operates on each respective dimension separately and independently. In some instances, the processing operates iteratively, in that, information identified from processing one of the dimensions is employed in directing the processing in another of the dimensions. Such operation may be performed iteratively by updating/modified information associated with one or more of the dimensions as well. Moreover, decoding may operate in accordance with iterative demapping (e.g., error correction code (ECC) and/or forward error correction (FEC) code by which information bits are encoded) to make estimates of bits within a signal sequence, and those estimates may be used in a subsequent iteration of demapping.11-01-2012
20100316170Method and System for Bandwidth Detection - A method detects a bandwidth that is transmitted by a transmitter in a radio communications system, which is based on transmission frames. The transmission frames comprise a fixed time extension and a variable spectral extension. The transmission frames consist of a plurality of sub-units. Each sub-unit of the transmission frames contains a control channel, which is subdivided into two sub-control channels. The two sub-control channels are arranged at the spectral edges of the sub-units of the transmission frames. The transmitted bandwidth is investigated by determining the spectral extension of the transmission frame. The spectral extension of the transmission frame is determined by determining the spectral position of the sub-control channels in the sub-units of the transmission frames.12-16-2010
20100316169METHOD AND SYSTEM FOR OPERATING A MIMO DECODER - Varying embodiments of the present invention provide a MIMO apparatus, such as a transceiver and a method of operation thereof. In an embodiment, the transceiver employs a parallelized., two-stage pipeline architecture that reduces the overall latency of the system. This reduction in latency translates to cost savings and higher data rates for the same hardware clock speed.12-16-2010
20130156133Flexible Channel Decoder - A configurable Turbo-LDPC decoder comprising: 06-20-2013
20130156134APPARATUS AND METHOD FOR A DUAL WATCH RECEIVER - A receiver for a wireless communication device provides a dual path receiver receiving first and second protocol-agnostic, uncorrelated receive signals simultaneously. The dual path receiver generating first and second offset IF signals from the simultaneously received first and second protocol-agnostic, uncorrelated receive signals. The receiver utilizes at least one converter for converting the first and second offset IF signals into at least one serial synchronous interface (SSI) signal representing the spectrum at IF. At least one processor receives the at least one SSI signal and applies parallel processing paths to demodulate the at least one SSI signal into separate baseband signals. The processor provides interference detection of, and level control for, the first and second offset IF signals.06-20-2013
20130156135I/Q DEMODULATION APPARATUS AND METHOD WITH PHASE SCANNING - An I/Q demodulation apparatus and method with phase scanning are provided. The demodulation apparatus includes a ring oscillator, a first latch unit, a decoding unit, a counter unit, a second latch unit, a first arithmetical unit and a second arithmetical unit. The first latch unit samples phase signals outputted from the ring oscillator. The decoding unit decodes the output of the first latch unit to correspondingly generate fine code of a first, a second, a third and a fourth codes. The counter unit counts the phase signals. The second latch unit samples the output of the counter unit to correspondingly generate coarse code of the first, the second, the third and the fourth codes. The first arithmetical unit performs an addition/subtraction operation by using the first code and the second code. The second arithmetical unit performs the addition/subtraction operation by using the third code and the fourth code.06-20-2013
20130156136APPARATUS AND METHOD FOR ITERATIVE DETECTION AND DECODING IN WIRELESS COMMUNICATION SYSTEM - Provided is an apparatus and method for iteratively detecting and decoding a received signal in a wireless communication system. An apparatus for iterative detection and decoding (IDD) in a wireless communication system may determine a predetermined group to be updated in a first soft decision sequence, may transmit detection control information of the determined group, and may generate a second soft decision sequence based on a detection operation result of a predetermined received signal portion that is extracted based on the detection control information.06-20-2013
20130156137RECEIVING APPARATUS THAT RECEIVES PACKET SIGNAL - An RF unit receives predetermined signals. The RF unit amplifies the received signals. A gain control unit controls the gain at the RF unit based on the amplified signal and has the RF unit use the controlled gain. The gain control unit performs different controls on the received signals, depending on the case when the received signal is a known signal placed in the beginning of packet signal and the case when the received signal is a signal other than the packet signal.06-20-2013
20130182800Real Time Processing supported by Programmable Control Unit - The real time processing supported by programmable control unit (RTP PCU) includes a method, a system and an apparatus for implementing programmable algorithms for analyzing a very wide range of low and high frequency wave-forms. The RTP PCU comprises sequential processing stages (SPS) for real time capturing and processing of in-coming wave-form and a programmable control unit (PCU) for controlling SPS operations and supporting adaptive signal analysis algorithms. The RTP PCU further comprises a circuit for Sequential Data Recovery from Multi Sampled Phase (SDR MSP).07-18-2013
20130182801Diversity Receiver and Method Performed by a Diversity Receiver - A diversity receiver includes a plurality of receiver circuits that are configured to receive and process the received radio frequency signals. A channel estimator is coupled to at least one of the plurality of receiver circuits and is configured to determine at least one channel estimation value for the received radio frequency signals. A controller is coupled to the channel estimator and to at least one of the plurality of receiver circuits and is configured to selectively activate or deactivate the at least one of the plurality of receiver circuits based on the determined at least one channel estimation value.07-18-2013
20130182802RECEIVER APPARATUS, RECEPTION METHOD, AND RECEPTION PROGRAM - A receiver apparatus includes a propagation channel estimating unit that estimates a propagation channel. The propagation channel estimating unit includes a path detector unit that repeatedly performs a process of detecting paths in the order of increase in a propagation channel goodness of fit. The receiver apparatus that estimates a propagation channel at a high accuracy level with a small amount of calculation operation involved is thus provided.07-18-2013
20120281789Characterizing channel response using data tone decision feedback - In addition, to pilot tones which may be existent within an orthogonal frequency division multiplexing (OFDM) signal, one or more data tones within that same signal may be employed to assist with channel estimation (alternatively, detection). Once a data tone qualifies as a pseudo-pilot tone, it may be used with the pilot tones for channel estimation. A qualifier considers slicer error associated with hard decisions for a data tone to determine if it is a candidate for assistance within channel estimation. A frame within an OFDM signal may, in one situation, include no pilot tones at all, and a previously calculated channel estimate may be used to process that frame. In addition, fewer pilot tones than needed to perform accurate channel estimation (based on the channel delay spread) may be employed by using one or more pseudo-pilot tones (e.g., qualified data tones).11-08-2012
20130182798METHOD, APPARATUS, AND COMPUTER PROGRAM PRODUCT FOR DIGITAL STREAM SWAPPING BETWEEN SIGNAL SOURCES - Method, apparatus, and computer program product example embodiments for digital stream swapping between digital signal sources. A new event handler functionality enables swapping an existing digital stream to a next one if more than one digital stream is identified, enabling a user to easily and intuitively switch between the existing streams.07-18-2013
20130182799DM-RS BASED DECODING USING CSI-RS-BASED TIMING - Certain aspects of the present disclosure relate to a method of wireless communication that includes receiving one or more channel state information reference signal (CSI-RS) resources. The method further includes performing timing estimation based on the one or more CSI-RS resources, receiving a demodulation reference signal (DM-RS) based transmission, and utilizing the timing estimation to decode the DM-RS based transmission.07-18-2013
20090290659Channel stacking system and method of operation - A channel stacking system includes first and second downconverting stages, first and second analog to digital converters, and a digital switching and signal processor. The first downconverting stage includes a first downconverter circuit having an input for receiving a first RF input signal which includes a multitude of first channels. The first downconverter circuit frequency downconverts the first RF input signal to a first IF signal which includes the multitude of first channels. The first analog-to-digital converter converts the first IF signal to a first digital IF signal. The second downconverter stage includes a second downconverter circuit having an input for receiving a second RF input signal which includes a multitude of second channels. The second downconverter circuit frequency downconverts the second RF input signal to a second IF signal including said multitude of second channels.11-26-2009
20110286554RF receivers - A method and apparatus are provided for receiving an RF service. At least two RF channels 11-24-2011
20110293047DATA RECEIVER CIRCUIT - A data receiver circuit includes: a clock/data recovery circuit to recover a clock and data from a received signal; a fixed pattern generation circuit to generate fixed pattern data; a first selection circuit to select and output one of the fixed pattern data generated by the fixed pattern generation circuit and recovered data recovered by the clock/data recovery circuit; a second selection circuit to select and output one of a reference clock and recovered clock recovered by the clock/data recovery circuit; and a switching circuit to make the first selection circuit output the fixed pattern data and to make the second selection circuit output the reference clock, when an input signal is lost or the clock/data recovery circuit is in a loss-of-lock state.12-01-2011
20110311001SYSTEM FOR RECEIVING DIGITAL AUDIO DATA - A system for receiving digital audio data may include a diversity-receiving unit. The diversity-receiving unit may include at least two antennas and at least one receiving channel, which can be switched from one antenna to another antenna. To reduce audible disturbances in the receiving channel, a dropout concealment may be carried out when disturbances in the received audio signal occur. The dropout concealment may use intact audio signal parts before the disturbance and/or after the disturbance to synthesize the concealment signal. The receiving channel may be switched to another antenna as a function of whether the dropout concealment is activated.12-22-2011
20110311000COMMUNICATION DEVICE AND CONTROL METHOD THEREOF - A communication device including a receiving unit and a signal processing module having a simulation unit and a decision unit is provided. The receiving unit receives a first burst of a paging message provided from a base station. Base on a reference burst code and an estimated channel impulse response of the communication channel, the simulation unit generates a simulation burst. The decision unit then determines if the paging message is a dummy message in accordance with the first burst and the simulation burst. The decision unit requests the receiving unit to stop receiving the paging message once the paging message is determined to be a dummy message.12-22-2011
20110310999Dynamic Optimization of Overlap-and-Add Length - A method of performing overlap-and-add length for zero-padded suffixes. The method includes derotating received information symbol samples. The derotated received information symbol samples include a first set of derotated received information symbol samples and a second set of derotated received information symbol samples. The first set of derotated received information symbol samples are stored in a buffer. The second set of derotated received information symbol samples are provided to a received sample processing unit. The received zero-padded suffix samples are deroted. Based upon an overlap-and-add length, at least a fraction of the derotated received zero-padded suffix samples is added with at least a fraction of the first set of derotated received information symbol samples to produce multiple summed samples. The multiple summed samples is provided to the received sample processing unit.12-22-2011
20120020438RECEPTION APPARATUS - A reception apparatus is an apparatus for receiving serial data and includes a sampler portion, an edge detection portion, a logical addition operation portion, a timing determination portion, a register portion, a selector portion and a latch portion. The edge detection portion inputs data OSD[n] output from the sampler portion, performs an exclusive OR operation between the data OSD[n] and data OSD[n+1] which are adjacent to each other, and outputs data EDG[n] which is the result of the exclusive OR operation. The logical addition operation portion inputs the data EDG[n] output from the edge detection portion, performs, for a predetermined time period, an OR operation on the data EDG[n], with n01-26-2012
20130195227Removal of a Band-Limited Distributed Pilot from an OFDM Signal - A technique for removing a band-limited distributed pilot signal from an orthogonal frequency division multiplexed (OFDM) signal involves converting a received OFDM signal, which includes a distributed pilot signal and an OFDM data signal, into a frequency domain signal having populated frequency bins containing respective subcarrier signals, each including a constituent data signal of the OFDM data signal and component pilot signal of the distributed pilot signal. An average magnitude of the populated frequency bins is determined based on the absolute values of the complex components of the populated frequency bins of the frequency domain signal, and the average magnitude of the populated frequency bins is used to estimate a pilot signal magnitude. The distributed pilot signal is removed from the frequency domain signal using a stored replica of the pilot signal scaled in conjunction with the pilot signal magnitude to yield the OFDM data signal.08-01-2013
20130195228ADAPTIVE LOADING FOR ORTHOGONAL FREQUENCY DIVISION MULTIPLEX (OFDM) COMMUNICATION SYSTEMS - An orthogonal frequency division multiplex (OFDM) transmitter may adaptively load each sub-carrier, buffering less than an OFDM frame in order to reduce hardware requirements and latency. The transmitter may use feedback information from the receiver regarding the quality of the sub-carriers. In addition, combining repetition and puncturing to achieve a desired date rate per class further reduces hardware by simplifying or even eliminating an interleaver. Additional mitigation and even performance enhancement techniques are incorporated to address inter-class boundaries within an OFDM frame, such as introducing transition classes. Channel state information may be reported in various formats including full bitmap, changed subchannels, and reported bad subchannels.08-01-2013
20130195225SYSTEMS AND METHODS FOR IMPROVING 25% DUTY CYCLE SWITCHING MIXER LOCAL OSCILLATOR TIMING - Systems and methods for improving the timing alignment of 25% duty cycle non-overlapping waveforms are provided. A representative system includes a waveform synthesizer that generates a plurality of 25% duty cycle input waveforms and inverters that receive the input waveforms at the inputs of the inverters and invert the input waveforms, producing a plurality of inverted waveforms at the outputs of the inverters. The system also includes NOR gates that receive the plurality of inverted waveforms at the inputs of the NOR gates and pass through one of the inverted waveforms at the outputs of the NOR gates responsive to three inverted waveforms of the plurality of inverted waveforms being at logic “0”; and mixers having inputs that receive the pass-through waveform and a first radio frequency (RF) signal, wherein the mixers combine the pass-through waveform and the RF signal into an output signal.08-01-2013
20130195226SYSTEMS AND METHODS FOR SIGNAL DETECTION AND ESTIMATION - Systems and methods are disclosed for detecting and/or measuring signals contained in modulated sample data, and that may be implemented in one embodiment to detect and measure signals by producing a representation and/or visualization of the signal information of the wide band spectral environment. Signals may be detected and/or measured by demodulating and estimating signal spectra from the modulated sample data that contain the individual signals, and by then forming a frequency representation of the demodulated Nyquist zone spectral estimates into a visual representation in which the frequency of the original signals is visible or otherwise indicated.08-01-2013
20120033764METHOD AND APPARATUS FOR AUDIO NOISE REDUCTION OF FREQUENCY MODULATION (FM) RECEIVER - A method and an apparatus for audio noise reduction of frequency modulation (FM) receiver are described. After receiving FM signal having pilot tone, pilot carrier sync detector performs pilot carrier synchronization detection of FM signal, FM demodulator demodulates synchronized FM signal, multiplex decoder decodes audio signal of demodulated FM signal for outputting the decoded audio signal, and noise reduction controls multiplex decoder for controlling noise attenuation associated with the decoded audio signal according to RSSI, the method comprising the steps: (a) performing phase error detection for detecting phase error of phase-locked loop (PLL) of pilot carrier sync detector; (b) determining whether noise exists by comparing the phase error with threshold value to determine whether noise exists in the phase error; and (c) performing noise reduction step by outputting noise reduction control signal to noise reduction based on determination in step (b) for reducing noise in the noise existence interval.02-09-2012
20130202063Extending the Set of Addressable Interferers for Interference Mitigation - Techniques for expanding the set of addressable interfering signals in an interference cancelling receiver are described, where the task of control message detection from interfering cells is integrated in an iterative receiver process where increasingly better a priori information on the received data signals from the previous iteration is used to detect additional control messages and successively grow the set of interfering signals included in the receiver's interference mitigation processing. In an example method, first estimated symbols for a desired signal are generated. A control channel corresponding to a first interfering signal is detected, where said detecting is based on the first estimated symbols. Signal characteristics information for the first interfering signal is then derived from the detected control channel signal, and used to generate second estimated symbols for the desired signal, using an interference-mitigation technique to mitigate the effects of the interfering signal.08-08-2013
20130202064ERROR SIGNATURE ANALYSIS FOR DATA AND CLOCK RECOVERY IN A COMMUNICATION SYSTEM - Described embodiments recover timing and data information from a signal received via a communication channel. An analog-to-digital converter (ADC) operating at a baud rate of the communication channel generates an actual ADC value corresponding to each bit sample of the received signal. A fast symbol estimation module estimates, based on the actual ADC value, a bit value corresponding to each bit sample. The fast symbol estimation module operates at a digital clock rate. The estimated bit values are provided to a timing recovery module. An ADC reconstruction module, based on a first number of pre-cursor estimated bit values, an estimated cursor bit value, and a second number of post-cursor estimated bit values, generates a reconstructed ADC value corresponding to each bit sample. Based on the reconstructed ADC values, the estimated bit values, and the actual ADC values, a corrected bit value is generated for each bit sample.08-08-2013
20130202067Heterodyne Receiver Structure, Multi Chip Module, Multi Integrated Circuit Module, and Method for Processing a Radio Frequency Signal - A heterodyne receiver structure comprises a frequency conversion block arranged to convert an incoming analogue radio frequency (RF) signal to an analogue intermediate frequency (IF) signal; a filter block arranged to filter said analogue IF signal; and an analogue-to-digital (AD) converter block arranged to convert said filtered analogue IF signal to a digital signal, wherein the AD converter block (08-08-2013
20130202066DUAL MODE RECEIVER CHANNEL SELECT FILTER - The dual mode receiver channel select filter includes a filter for a dual mode Bluetooth/Wireless Local Area Network (WLAN) receiver portion of a BT/WLAN transceiver. The filter is a 4th order complex filter and is digitally programmable and reconfigurable. Implemented as the channel select filter for dual-mode receivers, the filter adopts low-IF for Bluetooth and zero-IF for WLAN (IEEE 802.11b). It is based on simple active elements, such as current and voltage followers. The center frequency is digitally tuned through programming active current division networks (CDNs).08-08-2013
20130202065ADAPTATION USING ERROR SIGNATURE ANALYSIS IN A COMMUNICATION SYSTEM - Described embodiments provide method of adapting pulse response taps of a receiver. An analog-to-digital converter (ADC) generates an ADC value for each bit sample of a received signal. An error signature analysis (ESA) module defines a window of bit samples and, for the window, estimates a bit value corresponding to each sample based on the ADC value. The ESA module generates (i) a reconstructed ADC value corresponding to an estimated cursor bit based on a number of pre-cursor estimated bits, the estimated cursor bit, and a number of post-cursor estimated bits, and (ii) an error signature value based on the reconstructed ADC value and the ADC value. Based on the error signature value and a minimum pulse response value, it is determined whether the cursor bit corresponds to residual inter-symbol interference (ISI), and, if so, the error signature value is accumulated and tap values for each pulse response tap are adapted.08-08-2013
20120300882SYNCHRONIZATION CIRCUIT AND SYNCHRONIZATION METHOD - A synchronization circuit that synchronizes received data, includes: a determiner for determining whether or not data with a phase of a internal clock can be stably captured by the synchronization circuit, when the synchronization circuit accepts the data received from another device connected to the synchronization circuit with the phase of the internal clock of the synchronization circuit; a first flip-flop circuit accepting the data and the internal clock, capturing the data with the phase of the internal clock and synchronizing the data, when the determiner determines that the synchronization circuit can stably capture the data; a second flip-flop accepting the data and an inverted internal clock that has a phase obtained by inverting the phase of the internal clock, capturing the data with the phase of the inverted internal clock, and synchronizing the data, when the determiner determines that the synchronization circuit can not stably capture the data.11-29-2012
20130094617DIGITAL BROADCAST RECEIVER APPARATUS AND DIGITAL BROADCAST RECEPTION METHOD - This invention provides detailed operations of a transmitter apparatus and a receiver apparatus that are capable of reproducing, possibly without delays, up-to-the minute earthquake reports conveyed via digital broadcasts. There are included a receiving unit for receiving the conveyed signal; a broadcast modulating unit for demodulating the digital broadcast signal from the conveyed signal received by the receiving unit; an emergency alarm broadcast activation flag detecting unit for detecting the emergency alarm broadcast activation flag from the conveyed signal received by the receiving unit; and an earthquake movement alarm information demodulating unit for demodulating the earthquake movement alarm information signal from the conveyed signal received by the receiving unit.04-18-2013
20120093264TONE SIGNAL CIRCUIT AND WIRELESS RECEIVER - In a tone signal circuit and a wireless receiver of the present invention, a digital signal in a frequency band including at least a tone signal component is input into a Goertzel filter. Further, an envelope of an output from the Goertzel filter is detected, and a derivative value of the envelope is derived. Then, if the derivative value is maintained to be equal to or greater than a first threshold value, it is determined that a first prerequisite for existence of the tone signal component is satisfied. The above tone signal circuit and the wireless receiver can perform highly-accurate tone detection in a small calculation amount.04-19-2012
20120093263Method and Apparatus for Interference Suppression using a Reduced-Complexity Joint Detection - A method of detecting a desired signal within a composite signal provides for suppression of interfering signal(s). The method, implemented in a wireless communication apparatus, for example, includes receiving the composite signal and obtaining sample values therefrom. At least some of the sample values include desired and interfering signal components. The method further includes generating an interfering signal channel estimate by: forming sample pairs for some or all of the sample values; identifying sample pairs of interest as those sample pairs in which the interfering signal component is the same; and calculating the interfering signal channel estimate as an average value determined from one or more of the sample pairs of interest. The method further includes detecting desired signal symbols from the composite signal in a joint detection process that functionally depends on the interfering signal channel estimate.04-19-2012
20130208832Partitioned radio-frequency apparatus and associated methods - Radio-frequency (RF) apparatus includes receiver analog circuitry that receives an RF signal and provides at least one digital signal to receiver digital circuitry that functions in cooperation with the receiver analog circuitry. The receiver analog circuitry and the receiver digital circuitry are partitioned so that interference effects between the receiver analog circuitry and the receiver digital circuitry tend to be reduced.08-15-2013
20130208833METHOD AND DEVICE FOR DECODING IN A DIFFERENTIAL ORTHOGONAL SPACE-TIME BLOCK CODED SYSTEM - A method and device for decoding in a differential orthogonal space-time block coded system are disclosed. The disclosed method includes: (a) receiving signals from a transmitter during a particular time slot segment, where the signals are encoded by differential orthogonal space-time block coding; (b) transforming to reception signals for two sub-systems by using a sum operation and a difference operation of the signals received in step (a), where the transformed reception signals for the two sub-systems maintain an orthogonality of an orthogonal space-time block coded system; and (c) performing decoding using the reception signals for the two sub-systems transformed in step (b). The method provides the advantage of lowering the level of operational complexity for decoding in a communication system that employs differential orthogonal space-time block coding.08-15-2013
20130208834RADIO COMMUNICATION APPARATUS, RADIO COMMUNICATION METHOD, AND RECORDING MEDIUM RECORDING RADIO COMMUNICATION CONTROL PROGRAM - A combination of antennas to be used is selected based on a distance between a plurality of antennas or the polarization direction of a radio signal to be transmitted/received.08-15-2013