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375 - Pulse or digital communications


375140000 - Direct sequence

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Class / Patent application numberDescriptionNumber of patent applications / Date published
375148000 Multi-receiver or interference cancellation 157
375150000 Correlation-type receiver 123
375149000 Having specific code synchronization 24
375152000 Matched-filter-type receiver 4
20120114020DE-SPREADING METHOD FOR NONCOHERENT RECEIVER AND RECEIVER APPLYING THE SAME - The present invention is directed to a de-spreading method for a noncoherent receiver including: obtaining an output signal from a matched filter of a noncoherent receiver, which is PSK modulated and is at least two times upsampled; performing a noncoherent demodulation step including performing a differential operation on an in-phase and quadrature-phase components of the output signal of the matched filter to obtain a demodulated signal; and performing a de-spreading step on the demodulated signal with a PN table corresponding to the demodulated signal to obtain the de-spreaded data, wherein the PN table corresponding to the demodulated data contains chips which are either logic 1 or logic −1. A noncoherent receiver is also provided.05-10-2012
20130121382SPREAD-CARRIER SELF-DETECTING CODE RECEIVER WITH SUMMED DELAY PROCESSING AND METHODS FOR SIGNAL ACQUISTION AND DETECTION - Embodiments of a spread-earner self-detecting code (SCSDC) receiver with summed-delay processing (SDP) and method are generally described herein. In some embodiments, the SCSDC-SDP receiver is arranged to generate a chip-matched filter output from a received spread-spectrum signal and perform SDP on the chip-matched filter output with a plurality of delay-processing chains. The SDP may include multiplying a conjugated and delayed chip-matched filter output with the chip-matched filter output and applying a code-matched filter that is matched to a delay-multiplied code. The outputs from the code-matched filters of each delay-processing chain may be coherently combined to provide an output having correlation peaks for use generating frequency error and timing information.05-16-2013
20100008405Reconfigurable Signal Processing Scheme - A method of ameliorating channel effects present in a signal received through a channel, wherein the signal conveys at least first and second information streams and the method comprises the steps of determining from the first stream activation of the second stream and processing the signal to ameliorate channel effects, when the second stream is present, in a first manner comprising filtering the signal through filter means to ameliorate channel dispersion and then processing the signal through Rake receiver means or, when the second stream is absent, in a second manner comprising processing the signal through the Rake receiver means without prior amelioration of channel dispersion by the filter means.01-14-2010
20130128930CONTINUOUS TIME CHAOS DITHERING - Embodiments of the present invention provide a system and method for further reducing cyclostationarity and correspondingly energy density in a chaotic spread spectrum data communication channel, by digitally generating a first chaotic sequence of values to form a spreading code. The spreading code is then used to form a digital IF spread spectrum signal having a uniform sampling interval. The digital IF spread spectrum signal is converted to a sampled analog IF spread spectrum signal at a conversion rate substantially equal to the uniform sampling interval. The duration of the sampling interval is then selectively varied in accordance with a first pseudo-random sequence, thereby introducing a known dither in the analog IF spread spectrum signal. After introducing the known dither, the analog IF spread spectrum signal is upconverted to an analog RF spread spectrum signal. The first pseudo-random sequences may be designed to be a chaotic sequence.05-23-2013
20130028297WINDOWING METHODS AND SYSTEMS FOR USE IN TIME-FREQUENCY ANALYSIS - The present embodiments include methods of time-frequency analyzing signals. Some embodiments provide methods of processing signals comprising: receiving a communication signal; adaptively partitioning the signal in a time domain into a plurality of windows of the signal; transforming each of the windows of the signal producing respective expansions in a frequency domain and obtaining respective samples of the windows of signal in the frequency domain; and mapping the samples in the frequency domain back into the time domain.01-31-2013
20090196330PRE-PHASE ERROR CORRECTION - A CDMA communication system includes a signal processor which encodes voice and nonvoice signals into data at various rates, e.g. data rates of 8 kbps, 16 kbps, 32 kbps, or 64 kbps as I and Q signals. The signal processor selects a specific data rate depending upon the type of signal, or in response to a set data rate. When the signal is received and demodulated, the baseband signal is at the chip level. Both the I and Q components of the signal are despread using the conjugate of the pn sequence used during spreading, returning the signal to the symbol level. Carrier offset correction is performed at the symbol level. A lower overall processing speed is therefore required.08-06-2009
20120183019Efficient Despread and Respread of Multi-rate CDMA Signals - A system and method, comprising a despread module that receives a descrambled signal and an identification of active codes, a soft-symbols memory communicably coupled to the despread module, and a respread module that receives the identification of active codes, a modulation type and gain estimate for the active codes, and soft symbol estimates for the active codes from the soft-symbols memory which is communicably coupled to the respread module, the despread module, comprising: a despread signal memory that receives the descrambled signal, a vector code despread module communicably coupled to the despread signal memory, an active code soft symbol grabber that receives the identification of active codes and is communicably coupled to the despread signal memory, wherein the despread signal memory receives properly arranged despread data from the vector code despread module.07-19-2012
20090122841Despreading circuit and electronic apparatus - For channelization codes CC#05-14-2009
20130039389METHOD AND ARRANGEMENT OF INCREASING IMPAIRMENT CO-VARIANCE MATRIX ESTIMATION ACCURACY - A method and arrangement of increasing impairment co-variance matrix R02-14-2013
20100046588REDUCED-COMPLEXITY ANTENNA SYSTEM USING MULTIPLEXED RECEIVE CHAIN PROCESSING - A method for processing signals is disclosed and may include performing using one or more circuits, orthogonally multiplexing, on to a single processing chain, a plurality of replicas of a signal received via a corresponding plurality of spatially distinct antennas. The orthogonally multiplexed plurality of replicas of the received signal may be converted to corresponding digital multiplexed signals that include multiplexed replicas of the plurality of received signals. The corresponding digital multiplexed signals may be demultiplexed to generate the plurality of replicas of the signal received via the corresponding plurality of spatially distinct antennas. The plurality of replicas of the received signal may be spread, for example, may be orthogonally spread.02-25-2010
20100103985METHOD AND APPARATUS FOR REDUCING MULTI-USER PROCESSING IN WIRELESS COMMUNICATION SYSTEMS - A method and apparatus is disclosed for reducing multi-user processing at the receiver in wireless communication systems. Detected codes are grouped according to channel impulse response and a parent code is identified for each group of detected codes. A matrix A is constructed and joint detection is performed using the identified parent codes. Data symbols of the detected codes are obtained from the data symbols of the identified parent codes.04-29-2010
20100103986Receiver - With the objective of enhancing receiving performance of a receiver with respect to pulse signals spread by spread codes, the receiver comprises an RF front-end section which performs amplification, an AD converter section which AD-converts signals outputted from the RF front-end section, a baseband section which inversely spreads the output of the AD converter section and performs signal detection and demodulation thereon, a reception environment measuring section which measures reception environment using the input signals of the baseband section, and a parameter setting section which sets parameters for respective parts on the basis of signals outputted from the reception environment measuring section. The parameter setting section sets the parameters for the respective parts to the optimum according to the environmental condition measured by the reception environment measuring section.04-29-2010
20100142594METHOD OF PROCESSING AN RF SIGNAL - A method of receiving and processing an RF signal comprises receiving (06-10-2010
20100142593Cross-Talk Mitigation In Global Navigation Satellite Systems - Embodiments related to cross-talk mitigation are described and depicted.06-10-2010
20130058381NONLINEAR SIGNAL PROCESSING METHOD AND APPARATUS FOR PULSED-BASED ULTRA-WIDEBAND SYSTEM - A method and apparatus are provided for processing a received pulsed-based ultra-wideband (UWB) signal before the signal is demodulated by an energy detection based receiver. A nonlinear signal processing unit contains one or multiple subunits, and each subunit consists of a nonlinear device and a filter. The nonlinear devices can be any devices that can shift signal, noise, and interference spectra in a nonlinear fashion, and include but are not limited to square law devices and Teager-Kaiser operators. By applying the nonlinear signal processing unit on the received UWB signal, a major part of the energy of noise and narrowband interferences is shifted to specific frequency ranges and then removed by the appropriate filter(s) in the nonlinear signal processing unit. Thus, the signal-to-noise-plus-interference ratio (SNIR) of the received UWB signal can be improved.03-07-2013
20110013674TIMING REGENERATING DEVICE - A timing regenerating device regenerates a process timing for demodulating a reception signal in a spread spectrum communication system. The timing regenerating device includes a signal extracting unit that extracts a baseband signal from the reception signal on which an inverse spread processing is performed and a reference clock generating unit that converts the baseband signal into an electric power and generates a reference clock for a latch timing of the baseband signal output from the signal extracting unit based on the electric power.01-20-2011
20090285266RAKE RECEIVING DEVICE, BASE STATION APPARATUS, RECEPTION CONTROL METHOD, AND RECEPTION CONTROL PROGRAM - When receiving digital data from a signal receiving unit, a rake receiving unit stores the received digital data on a memory. Then, when receiving path timing from a delay amount/path number detecting unit, the rake receiving unit determines a read address that is a position for starting reading, based on the path timing. Subsequently, the rake receiving unit starts reading from the determined read address, and carries out a de-spreading process.11-19-2009
20120224609ACTIVE SPREAD CODE DETECTION - A System, method and computer readable medium for determining an active code set comprises determining code detection statistics for corresponding spread code indices, sorting the determined code detection statistics and the corresponding spread code indices according to amplitudes of the code detection statistics, and determining an active code set based on the sorted code detection statistics and the corresponding sorted spread code indices.09-06-2012
20090238245DESPREADING SPREAD SPECTRUM DATA - A method for de-spreading spread data includes receiving a data stream by multiple access communication where the received data stream is spread using a pseudo-noise (PN) code; multiplying a first portion of the received data stream including data from a first user by a first portion of a PN signal to obtain a first product; providing the first product to a first counter; multiplying a second portion of the received data stream including data from a second user by the first portion of the PN signal to obtain a second product; providing the second product to a second counter; and determining whether the first portion of the PN signal and the second portion of the PN signal produce valid sequences based at least in part on the first product and the second product.09-24-2009
20120114018CONFIGURABLE BASEBAND IN A GPS RECEIVER - Clock compensation for GPS receivers. A receiver in accordance with the present invention comprises a Radio Frequency (RF) portion, and a baseband portion, coupled to the RF portion, wherein the baseband portion comprises a crystal, an oscillator, coupled to the crystal, wherein the oscillator generates a clock signal based on a signal received from the crystal, a counter, coupled to the oscillator via the clock signal, a comparator, coupled to the counter, a controller, at least one logic gate, coupled to the comparator and the controller, and a combiner, coupled to the at least one logic gate, the controller, and the counter and producing an accurate clock signal therefrom.05-10-2012
20120269236SIMPLE AND ROBUST DIGITAL CODE TRACKING LOOP FOR WIRELESS COMMUNICATION SYSTEMS - A simple and robust CTL is used for time tracking of multipath components of a spread spectrum signal transmitted over a wireless multipath fading channel. A digital code-tracking loop includes despreading early and late data samples by use of a pseudonoise sequence, an error signal output generated by the despreading, and adjustment for a plurality of on-time, early and late samples, a data rate of a control signal provided as a fractional proportion of a data rate of error signals.10-25-2012
20120269235MODULATION SIGNALS FOR A SATELLITE NAVIGATION SYSTEM - The present invention relates to a modulation system in which an m-level, m>2, digital subcarrier is used to modulate a signal.10-25-2012
20110150045System and Method for an Intelligent Radio Frequency Receiver - A method a system for receiving signals from plural frequency bands and plural communication protocols. An interchangeable radio frequency (“RF”) front end may receive RF signals from plural frequency bands and plural communication protocols. Intermediate frequency (“IF”) circuitry may produce one or more common IF signals from the received RF signals. A common digital back end may then receive digitized versions of the IF signals, modify IF signal bandwidth as a function of the plural communication protocols, and process plural received signals without knowledge of the underlying communication protocols.06-23-2011
20110286497TIME DEPENDENT EQUALIZATION OF FREQUENCY DOMAIN SPREAD ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING USING DECISION FEEDBACK EQUALIZATION - System and method for equalizing an orthogonal frequency division multiplexed signal having been encoded by spreading subcarriers in the frequency domain using orthogonal codes includes receiving the signal at a receiver (11-24-2011
20110292973METHOD FOR USING A MULTI-TUNE TRANSCEIVER - The method is for using a multi-tune transceiver. A single oscillator (VCO/DCO) is provided that is electronically connected to a divider (12-01-2011
20090154530MIMO/Transmit Diversity Channel Estimation - A receive station of the present invention despreads a received signal over multiple successive symbol periods of an extended measurement period to determine individual channel estimates over each symbol period of an extended period for multiple pilot signals. In one example, the extended measurement period comprises two extended periods, each of which comprise two symbol periods. As a result, the present invention provides channel estimates sufficient for both slow and fast fading conditions. The receive station determines a combined channel estimate for the pilot signals over each symbol period of an extended period by despreading the received signal over each symbol period of an extended measurement period using a common spreading sequence. Based on the combined channel estimates, the receive station determines individual channel estimates for each pilot signal over each symbol period of the extended period.06-18-2009
20080267260DYMANIC INTERPOLATION LOCATION - Apparatus and method for optimizing interpolation in the despreader data-path of a wireless telecommunications network employing CDMA technology. A base station dynamically evaluates its configuration to determine an interpolator location. The location of the interpolator in a despreader data-path is dynamically selected. A received signal is interpolated. The despread received signals are combined, and further processing is applied to the combined signal. To enhance system performance, the interpolator may be located at least to perform chip-sample interpolation per antenna stream at chip rate, chip-sample interpolation per user at chip rate, or symbol-sample interpolation per user at (sub) symbol rate.10-30-2008
20090310652BASE STATION HAVING A SET OF PHASED ARRAY ANTENNAS - A wireless communications handset configured to receive a multipath spread spectrum signal comprises a first antenna and a second antenna. A first receiver is coupled to the first antenna and a second receiver is coupled to the second antenna. A delay device is coupled to the first receiver and delays the portion of the multipath signal received by the first antenna. The delayed signal and the in-phase portion of the signal are then combined in a combining device. A despreader coupled to the combining devices generates a magnitude value of the combined signal. The current magnitude value is then compared to one or more previous magnitude values to determine if the delay should be increased or decreased. A comparison device outputs a comparison signal based on the current and previous magnitude values and provides the comparison signal to the delay device to adjust the delay appropriately.12-17-2009
20090310651SPREAD-SPECTRUM RECEIVER AND RECEPTION METHOD - Receivers and reception methods conduct spread spectrum reception using the energy of multiple bits, preferably a substantial number of bits, in a packet for correct alignment of the spreading code at the receiver. Code acquisition, as well as packet detection and acquisition are provided by embodiments of the invention. Preferred embodiment receivers and reception methods provide packet detection at low SINR looking at energy of multiple bits of the packet, frame synchronization using short preamble, timing recovery at low SINR looking at energy of multiple bits of the packet, quick code acquisition using parallel search for all possible code phases, code acquisition at low SINR, and tracking of acquired timing and code phase. Preferred embodiment receivers and reception methods use the energy of multiple bits for making decisions.12-17-2009
20100128758TRANSMISSION METHOD, TRANSMISSION APPARATUS, AND RECEPTION APPARATUS - A transmission method for transmitting modulation signals of a plurality of channels to the same frequency band from a plurality of antennas. At the time when a symbol for demodulation is inserted in a channel, in another channel symbol, the same phase and quadrature signals in the in-phase-quadrature plane are made to be zero signals. Thus, a plurality of modulation signals are multiplexed and transmitted and the transmitted multiplexed modulation signals are demultiplexed and demodulated at a reception apparatus, thereby improving the data transmission rate.05-27-2010
20110200074METHOD AND SYSTEM FOR SPREAD SPECTRUM SIGNAL ACQUISITION - A method for acquiring a direct sequence spread spectrum signal, which is transmitted on a carrier frequency and is modulated with a code signal of length equal to Nc chips, for determining a code delay of the spread spectrum signal and a Doppler shift with respect to the carrier frequency, the determination being performed on a discrete two-dimensional space of M possible code delays and F possible frequency shifts, includes: receiving and sampling the spread spectrum signal to obtain a sampled spread spectrum signal; performing a despreading operation of the sampled spread spectrum signal with a local replica signal of the code signal, by performing the despreading for a plurality of possible code delays between the sampled signal and the replica signal; and performing a parallel frequency search on the result of the despreading step, by performing a step of computing a Fourier transform on the result. The Fourier transform is a fractional Fourier transform.08-18-2011
20090201974METHODS AND APPARATUS FOR SPREAD SPECTRUM MODULATION AND DEMODULATION - The present invention relates to a method and an apparatus for spread spectrum modulation and demodulation using a special spread spectrum sequence, characterized in that Golay complementary codes are modulated onto orthogonal channels such that a corresponding complex complementary code is obtained. The signal spread by such complex complementary code has a low peak-to-average power ratio, a sound self-correlation property and cross-correlation property, which can well solve the problem of multi-access interference such that the communication performance of the entire system is improved.08-13-2009
20110170576RANGING APPARATUS, POSITIONING APPARATUS, AND METHODS OF RANGING AND POSITIONING THEREFOR - A multipath mitigation technology (MMT) can mitigate the influence of multipath when a received signal is composed of a single direct-path wave and a single multipath wave. However, in an actual environment, it is not always true that the number of multipath wave is only one. When a plurality of multipath waves is included in the received signal, the influence of multipath cannot be completely removed. On the contrary, when no multipath wave is included, an error occurs because a single direct-path wave is deemed as a single direct-path wave and a single multipath wave for estimation. In addition, difficulties arise in calculation when maximum likelihood estimation is performed targeting a time-domain signal. A positioning apparatus estimates parameters for a signal model by applying thereto the maximum likelihood estimation in the frequency domain, and estimates the signal model based on an information criterion, so that multipath errors are mitigated.07-14-2011
20090274196COMMUNICATION RECEIVER WITH HYBRID EQUALIZER - Wireless communication receiver with hybrid equalizer and RAKE receiver. The receiver compares performance of the system for RAKE only and RAKE in combination with equalizer estimates. The receiver enables or disables the equalizer accordingly.11-05-2009
20080212654Determinting a Detection Signal in a Spread Spectrum Communications System - Disclosed is a method of generating a detection signal for detecting energy in a spread-spectrum signal, comprising: de-spreading the spread-spectrum signal by applying a predetermined spreading code to obtain a sequence of de-spread signal symbols (09-04-2008
20090034588METHOD AND APPARATUS TO PROCESS DEDICATED PILOT BITS FROM MULTIPLE FINGERS - A method to process DP bits from multiple fingers within a WCDMA rake receiver is provided. DPCH pilot symbols are received, quantized and channel compensated. Then processing operations for individual fingers for the channel compensated quantized despread DPCH pilot symbols are chosen based on the DPCH slot format. The DPCH pilot symbols are processed based on the DPCH slot format in order to produce processed DPCH pilot symbols in a common format. These processed symbols may then be combined. Other embodiments may further allow for the computation of an SNR estimate based on the combined DPCH pilot symbols.02-05-2009
20080291979Method and Spread Spectrum Software Receiver for Satellite Navigation - A spread spectrum signal receiver includes a radio signal processing unit, which is at least partly implemented in software running on a processor. The processing unit is adapted to estimate a respective processing demand required to produce position/time related data based on each subset of a number of candidate subsets of signal sources among a group of potential signal sources. Each candidate subset contains at least a minimum number of signal sources, which is necessary to produce the position/time related data of a desired quality. The processing unit is adapted to select a set of preferred signal sources from the group of potential signal sources based on a candidate subset, which is associated with a lowest estimated processing demand during a subsequent receiver operating period. Then, the receiver receives spread spectrum signals from the selected set of signal sources, and based on the received signals produces position/time related data.11-27-2008
20080310485SYSTEM AND METHODS FOR CONTROLLING MODEM HARDWARE - Systems and methods are provided for minimizing power consumption in a wireless mobile device. In one embodiment, a computer implemented method is provided that facilitates utilization of resources of a mobile device. This includes identifying available resources of a device and dynamically disabling or enabling subsets of the resources as a function of at least a channel estimation to improve or optimize performance of the device.12-18-2008
20120033713METHOD, APPARATUS, AND USER TERMINAL FOR RECEIVING AND PROCESSING DATA - The present invention discloses a method for receiving and processing data. The method includes: convoluting a channel estimate value of a receive end with an SCH signal transmitted by a transmit end on an SCH and obtaining an SCH signal in a receive signal of the receive end; evaluating a difference between the receive signal and the SCH signal in the receive signal. An apparatus, and a user terminal are also disclosed in the present invention. By using the method and apparatus of the present invention, the SCH signal in a receiver may be restored and removed from the receive signal, and interference of the SCH on other channels may be eliminated, thereby improving performance of the receiver.02-09-2012
20100272160Decoding Data Transmitted Using Space-Time Spreading in a Wireless Communication System - Examples are disclosed for determining a bit error rate (BER) associated with decoding data transmitted using space-time spreading (STS) in a wireless communication system.10-28-2010
20090180520POSITIONING APPARATUS - A positioning apparatus has an oscillator that generates a reproduced carrier wave which keeps track of a carrier wave of a satellite signal; a pseudo noise generator that generates a pseudo noise code unique to a satellite; a control section that controls a phase of the pseudo noise code in accordance with a change in the phase of the reproduced carrier wave, to thus control the pseudo noise generator so as to keep constant a difference between the phase of the pseudo noise code included in a satellite signal and the phase of the pseudo noise code; a timing generation section that generates a timing associated with a rise or fall of the pseudo noise code; a frequency generation section that generates at least one frequency signal; a sampling section that samples an amplitude of the satellite signal by means of a frequency signal; a cumulative addition section that cumulatively adds a signal sampled by the sampling section; and a phase difference computing section that computes a phase difference between the pseudo noise code included in the satellite signal and the pseudo noise code by use of a result of cumulative addition. The frequency generation section selects a frequency signal in synchronism with a timing generated by the timing generation section.07-16-2009
20090129446METHOD AND APPARATUS FOR GENERATING PHASE SHIFTED LOCAL OSCILLATOR SIGNALS FOR A FEEDBACK LOOP ON A TRANSMITTER - A transmitter is provided with a local oscillator (LO) processing unit to maintain stability in the transmitter's feedback loop. The LO processing unit includes at least one delay locked loop (DLL) and a programmable divider to generate phase shifted LO signals for adjusting a loop phase of the feedback loop in the transmitter. The generated phase shifted LO signals are of both a coarse and fine phase shifted nature. The adjustability and control of the coarse and fine phase shifting of the LO signals maintains linearity in the transmitter feedback loop.05-21-2009
20090129447EFFICIENT JOINT DETECTION - K data signals, or bursts, are transmitted over a shared spectrum in a code division multiple access communication format. A combined signal is received and sampled over the shared spectrum, as a plurality of received vector versions. The combined signal includes the K transmitted data signals. A plurality of system matrices and an associated covariance matrix using codes and estimated impulse responses of the K data signals is produced. Each system matrix corresponds to a received vector version. The system and covariance matrices are extended and approximated as block circulant matrices. A diagonal matrix of each of the extended and approximated system and covariance matrices are determined by prime factor algorithm-fast Fourier transform (PFA-FFT) without division of the matrix. The received vector versions are extended. A product of the diagonal matrices and the extended received vector versions is taken. An inverse block discrete Fourier transform is performed by a PFA-FFT on a result of the product to produce the estimated data of the K data signals.05-21-2009
20090129445INTERFERENCE CHARACTERISATION AND REMOVAL - A method of evaluating the usage in a received signal of codes from a tree of codes that can be used to orthogonalise communications signals, the method including testing to determine if a given code is in use in the received signal and deducing from the result and from the tree structure the need to test in the received signal for the use of the codes in the portion of the tree depending from said given code. The invention also includes corresponding apparatus and software.05-21-2009
20090003414UNIFIED MMSE EQUALIZATION AND MULTI-USER DETECTION APPROACH FOR USE IN A CDMA SYSTEM - A unified minimum mean square error (MMSE) equalization/multi-user detection (MUD) approach for demodulating direct sequence CDMA (DS-CDMA) signals is described. In at least one embodiment, the unified approach is capable of generating a variety of cost-effective receiver demodulation techniques that may range from, for example, a low cost linear MMSE equalization technique to a relatively high complexity MMSE MUD.01-01-2009
20090052502RAKE RECEIVER INTERFACE - In some embodiments of the present invention, a method and apparatus to generate interrupts in a transfer of information between a rake receiver and a processor, said interrupts having a rate of generation per unit time independent of a rate of the transfer of information per unit time.02-26-2009
20110228820METHOD AND SYSTEM OF LOCATING OBJECTS - The invention concerns a method and system of locating objects by means of UWB signals, the system including a search device (D09-22-2011
20110142099CONTROL DEVICE FOR ONE OR MORE SELF-PROPELLED MOBILE APPARATUS - A device for controlling self-propelled mobile apparatus(es) (06-16-2011
20110142098RECEPTION APPARATUS, RECEPTION METHOD, RECEPTION PROGRAM, AND RECEPTION SYSTEM - Disclosed herein is a reception apparatus including: a spectrum inversion detection section configured to detect the occurrence or absence of spectrum inversion in a received signal complying with the Digital Video Broadcasting-Terrestrial 2 standard known as DVB-T2, using a P1 signal constituting the received signal; a spectrum inversion section configured to perform a spectrum inversion process on the received signal if the occurrence of the spectrum inversion is detected at least by the spectrum inversion detection section; and a demodulation section configured to demodulate the received signal having undergone the spectrum inversion process if the occurrence of the spectrum inversion is detected by the spectrum inversion detection section, the demodulation section further demodulating the received signal yet to undergo the spectrum inversion process if the absence of the spectrum inversion is detected by the spectrum inversion detection section.06-16-2011
20090316761Method and Apparatus For Transmitting and Receiving High Speed Data Using Code Division Multiple Access Channels - The present invention describes a spread spectrum communication system wherein the frequency of carriers and the code channels of the carriers or both for transmission to a given remote station user vary in time. This provides for a direct sequence spectrum communications system which changes frequency or code channel according to a predetermined pattern. The code channels and frequencies can be determined in accordance with a deterministic function or based upon a subset of the data to be transmitted. A receiver structure is also described for receiving the same.12-24-2009
20100158080WIRELESS RECEPTION DEVICE, WIRELESS COMMUNICATION SYSTEM AND WIRELESS COMMUNICATION METHOD - A wireless reception device which communicates with a wireless transmission device which has a plurality of transmission antennas, includes at least one reception antenna which receives a plurality of transmission signals transmitted from the plurality of transmission antennas of the wireless transmission device; a channel response estimation unit which estimates a channel response between a plurality of transmission antennas and the reception antenna; a block dividing unit which divides a reception signal of at least one reception antennas into a plurality of blocks; and a transmission signal detection unit which detects the plurality of transmission signals transmitted by the wireless transmission device based on a plurality of reception signals divided by the block dividing unit and the channel response estimated by the channel response estimation unit.06-24-2010
20090316760UWB APPARATUS AND METHOD - An ultra-wideband receiver for processing a received signal comprising two or more diversity signals formed using a spreading technique at a transmitter comprises channel estimation means for estimating the channel over which the signal was transmitted. The receiver comprises inverting means for inverting the channel estimate obtained from the channel estimation means, the inverse of the estimated channel being applied to the received signal to generate a compensated signal. The receiver comprises means fur weighting the compensated signal prior to demodulation using an estimate of noise in each channel, the estimate of the noise in each channel being derived from the inverse of the channel estimation process.12-24-2009
20100158079ID-CELL INDEX SEARCH ALGORITHM AND CARRIER FREQUENCY OFFSET ESTIMATION - Techniques for initial wireless network synchronization by a mobile station are provided. For certain embodiments, the techniques may involve a joint search for the cell identification (ID-cell index) and the coarse carrier frequency offset (CFO) estimation. For certain embodiments, the techniques may be based on hard correlation and binary differential despreading that substantially simplifies computational complexity compare to known techniques that independently search for the ID-cell index and perform CFO estimation.06-24-2010
20110128998Software Based Spread Spectrum Signal Processing - A digital processing unit for use in a spread spectrum signal receiver, the digital processing unit being adapted to receive an incoming stream of data samples and in response thereto produce a decoded signal, the digital processing unit comprising a correlation module adapted to correlate data blocks formed from the incoming stream of data samples with a local code replica segment to produce a first number of intermediate accumulation results and an aggregation module adapted to receive the first number of intermediate accumulation results and to combine the first number of consecutive ones of said intermediate accumulation results to form a target number of aggregated accumulation results, said target number being less than or equal to the first number.06-02-2011
20100177806GNSS Receiver - A GNSS receiver including a processing unit adapted to process radio signals transmitted from an active set of signal sources and based thereon produce position/time related data. The signals of the active set are processed in parallel with respect to a real-time signal data rate of the signals by a respective tracking channel resource allocated for each signal source. The processing unit also has a monitoring channel resource adapted to process radio signals transmitted from each of at least two signal sources in an additional set of signal sources different from the signal sources in the active set. The processing unit is adapted to process the radio signals of the additional set according to a cyclic processing sequence such that the signals from any of the signal sources in the additional set can be included into a navigation solution without delay.07-15-2010
20130215934UNIPOLAR SPREAD SPECTRUM MODULATION FOR LOW COMPUTATION AND POWER COST SIGNAL MULTIPLEXING WITH APPLICATION TO FNIRS MEASURMENTS - This invention teaches a way to multiplex and de-multiplex unipolar signals using spread spectrum methods. While bipolar spread spectrum signal multiplexing may be used in may applications, for example for systems using radio signals, when using unipolar signals there is a loss of orthogonally which makes the standard algorithms unworkable. This invention teaches a method to recover orthogonally and make spread spectrum multiplexing useful for unipolar signals. One example is in the measurement of optical absorbance along multiple paths simultaneously using light signals, as for functional near infrared spectroscopy (fNIRS).08-22-2013
20100208773Auto-Calibration Filtering Device - A filtering device based on an active transconductance filter includes auto-calibration means, the principle of calibration consisting in slaving the power supply current for the filter as a function of the phase shift between a second signal shifted by a first predetermined phase shift with respect to a periodic reference signal, and the output signal of the filter in response to a first signal shifted by a second predetermined phase shift with respect to the periodic reference signal, the slaving tending to minimize the phase shift between the output signal of the filter and the second signal.08-19-2010
20090285267METHOD AND APPARATUS FOR MAXIMIZING STANDBY TIME IN REMOTE STATIONS CONFIGURED TO RECEIVE BROADCAST DATABURST MESSAGES - A wireless telecommunications system includes a base station, a plurality of remote stations, a first channel for general page messages containing paging information and broadcast databurst message references, and an auxiliary channel for broadcast databurst notification indicators for the purpose of increasing standby time in remote stations configured to receive broadcast databurst messages.11-19-2009
20110128996IBOC BROADCAST RECEIVER - A broadcast receiver suitable for receiving broadcast signals transferred by use of signal format of IBOC system. The broadcast receiver comprises a receiving means that holds information related to channels that can be acquired by a digital signal decoding process. If information related to a channel is to be used and is held by the information holding means, then it is used.06-02-2011
20080317101Method and apparatus for detecting lock status of a GPS signal - An apparatus for detecting lock status of a spread spectrum signal, having a first accumulator, a first calculation unit, a second calculation unit, a second accumulator, a multiplier and a comparator. The first accumulator accumulates an in-phase integration result and a quadrature integration result over a time period. The first calculation unit determines a first evaluation value based on the accumulated in-phase integration result and the accumulated quadrature integration result. The second calculation unit processes the in-phase integration result and the quadrature integration result. The second accumulator accumulates the output of the second calculation unit over the time period. The multiplier determines a second evaluation value by multiplying the accumulated result from the second accumulator with a predetermined value. The comparator compares the first and second evaluation results wherein the comparison result is an indicator of the lock status.12-25-2008
20090074035Receiver for Receiving a Spectrum Dispersion Signal - A receiver for the CDMA system which reduces power consumption during a suspension period of intermittent receiving operation by monitoring a suspension period by a low-power timer so that a VC-TCXO, reference signal group generation and receiving units are turned off and a modem unit is set to a sleep state. Upon resumption of receiving operation, a high-accuracy timer is started to count a time period and part of a received signal is stored. A PN code phase of stored data is calculated during the time period to obtain an indication value for phase deviation. State vectors for short and long codes and a further reception time are calculated based on the indication value. When the high-accuracy timer counts the time period and produces 0V(d), demodulation operation by a rake demodulation, demultiplexing, and descrambler units is started and is continued during the reception time.03-19-2009
20090074036SEGMENT-WISE CHANNEL EQUALIZATION BASED DATA ESTIMATION - Data is estimated of a plurality of received spread spectrum signals by a wireless communication apparatus. The plurality of received communications are received in a shared spectrum. The received communications are sampled to produce a received vector of sequential samples. The received vector is processed to produce a plurality of segments. Each segment is processed separately to estimate data of the received communications.03-19-2009
20100020853SPREAD SPECTRUM MODULATOR AND DEMODULATOR - A spread spectrum modulator converts input sequences composed of digital symbols into n≧2 spread-spectrum sequences. The spread spectrum modulator can generate spreading code and can combine the spreading code with the input sequences to produce the n spread spectrum sequences for transmission from n respective antennas of a radio transmitter. Each spread spectrum sequence corresponds to a sum of at least two contributions mutually shifted by a time substantially less than the duration of a symbol, each contribution being the product of a version of one of the n input sequences times the spreading code.01-28-2010
20090147833Multi-path detection method for CDMA recievers - The present invention provides a method for a multi-path detection analysis and selectivity of CDMA signals using spread spectrum receivers using a correlation technique. The invention is based on determining by the spread spectrum receiver whether a distortion of a received radio frequency signal, caused by a multi-path component of said received signal, meets a predetermined condition using a pre-selected correlation analysis of said received signal. This invention is generally applicable to global navigation satellite system (GNSS) receivers and it is particularly useful in GNSS receivers, such as GPS (global positioning system) and Galileo receivers. The important goal of this invention is to provide a simple method for identifying signals that are corrupted by multi-path effects, and can be excluded from position calculation in the GNSS receivers.06-11-2009
20120195350System and Method for Facilitating Data Transfer Using a Shared Non-Deterministic Bus - System and method for facilitating data transfer between logic systems and a memory according to various conditions. Embodiments include systems and methods for facilitating and improving throughput of data transfers using a shared non-deterministic bus, a system and method for managing a memory as a circular buffer, and a system and method for facilitating data transfer between a first clock domain and a second clock domain. Embodiments may be implemented individually or in combination.08-02-2012
20100278217METHOD AND SYSTEM FOR MULTI-USER DETECTION USING TWO-STAGE PROCESSING - Systems and methods for multi-user detection are provided. In one aspect of the disclosure, an apparatus is provided. The apparatus comprises a processing unit configured to process a plurality of received chips into a plurality of received symbols for a plurality of users. The apparatus further comprises a computation unit configured to compute a multi-user matrix relating a plurality of user symbols for the plurality of users to the plurality of received symbols and a detection unit configured to detect the plurality of user symbols for the plurality of users using the computed multi-user matrix and the plurality of received symbols.11-04-2010
20110128997Tensor-Based Receiver for Separating Component Signals in a Composite Signal - A receiver separates multiple component signals carried in a composite signal that have been spread over time and frequency. Multiple diversity branches receive the composite signal. A tensor generation circuit arranges samples of that signal along time, frequency, and diversity dimensions to obtain a composite signal tensor. A set of cascaded least squares estimators then separates the component signals by fitting a constrained tensor model of the composite signal to the composite signal tensor in an alternating least squares estimation process, alternating during any given iteration of the process between fitting different unfolded representations of the constrained tensor model to corresponding unfolded representations of the composite signal tensor. The tensor model models the composite signal as a linear combination of rank-one tensors associated with the component signals, and is constrained in the sense that each rank-one tensor remains constrained according to the spreading of its associated component signal over time.06-02-2011
20090067477Method and Apparatus for Measuring Timing of Signals Received from Multiple Base Stations in a CDMA Communication System - Unassigned finger processors are used to process and measure the arrival times of transmissions from base stations not in the active set. A first set of one or more base stations in active communication with the remote terminal is identified and each base station in the first set is assigned at least one finger processor. A second set of one or more base stations not in active communication with the remote terminal is also identified and an available finger processor is assigned to each of at least one base station in the second set. A (signal arrival) time measurement is then performed for each base station, and outputs indicative of the measurements are provided for further processing.03-12-2009
20110085583RECEPTION APPARATUS USING SPREAD SPECTRUM COMMUNICATION SCHEME - In a reception apparatus, a matched filter that has conventionally been arranged in a searcher unit is mounted on an acquisition unit together with a large scale memory. The large scale memory once stores reception chip signals, and thereafter outputs them to the matched filter and to the delay profile calculation unit. A setting register receives an acquisition signal and outputs it to the matched filter. The matched filter performs acquisition of the reception chip signals outputted from the large scale memory, and outputs a despread timing signal to a despread circuit, a code generation circuit and the delay profile calculation unit.04-14-2011
20100135363Supporting a Signal Acquisition - The invention relates to supporting an acquisition of a signal, wherein the signal comprises a sequence of complex valued samples, wherein the acquisition comprises an integration of the complex valued samples in subsequent integration intervals, and wherein the signal may be subject to a frequency drift. In order to enable an improved acquisition, a phase angle is estimated in the signal in a respective integration interval (step 06-03-2010
20110075711WIRELESS RECEIVER, WIRELESS COMMUNICATION SYSTEM, AND WIRELESS COMMUNICATION METHOD - A wireless receiver receives a signal obtained by multiplexing a plurality of signals that include a synchronization signal that is spread using a non-orthogonal code not orthogonal to a code for spreading other signals other than the synchronization signal. Then, in a case when the signals other than the synchronization signal are the target signals for decoding, the wireless receiver performs despreading with respect to the received signal using the synchronization signal and estimates the signal amplitude of the non-orthogonal code. Subsequently, the wireless receiver eliminates the spread synchronization signal from the received signal using the estimated signal amplitude of the non-orthogonal code and using the synchronization signal. Eventually, the wireless receiver performs despreading and demodulation with respect to the signal having the spread synchronization signal eliminated therefrom and decodes the target signals for decoding.03-31-2011
20090213906Galileo/GPS Receiver with Improved Positioning Accuracy - Embodiments related to global positioning are described and depicted.08-27-2009
20120201278CROSS-TALK MITIGATION IN GLOBAL NAVIGATION SATELLITE SYSTEMS - The embodiments are directed to increasing receiver sensitivity in GNSS systems. The embodiments utilize a first direct-sequence spreading code and a second direct-sequence spreading code modulated on each GNSS signal for enhancing the receiver sensitivity. In the following the term “direct-sequence spread spectrum code” may also be referred to as “direct-sequence code” or simply “code”.08-09-2012
20110150044Methods for Fast and Low-Power UWB IR Baseband Receiver Synchronization - The invention relates to methods for synchronising a device to a signal containing a train of pulses representing a programmable number of repetitions of a predetermined code. Pulse position and code phase are searched for. In a first aspect, a programmable number of samples is taken per pulse frame in function of the available number of repetitions of said predetermined code. In a second aspect, the method comprises a signal detection stage from which, after performing a confirmation stage, information can be kept for a subsequent stage. In a third aspect, only a limited number of rotated versions of the predetermined code are checked, using a presumed code phase which is kept from a preceding stage.06-23-2011
20120033714High data rate transmitter and receiver - A high-speed transmitter and receiver are provided. In one embodiment, a transmitter comprises a baseband processor structured to receive data and to convert the data into a multiplicity of high and low signal values, with each high and low signal value having a first timing interval. A local oscillator generates a clock signal at a second timing interval and a digital circuit combines the high and low signal values with the clock signal to produce a transmission signal directly at a transmission frequency. A receiver is configured to receive the signal. This Abstract is provided for the sole purpose of complying with the Abstract requirement rules that allow a reader to quickly ascertain the subject matter of the disclosure contained herein. This Abstract is submitted with the explicit understanding that it will not be used to interpret or to limit the scope or the meaning of the claims.02-09-2012
20080304552Receiver for communication system - A receiver includes a channel providing information received from wireless communications, including information from a selected user. A minimum mean square error combiner is coupled to the channel for receiving samples in a symbol duration and minimizes mean square error in such samples. The combiner has coefficients derived from a training sequence. Information of the selected user is extracted from a mixture consisting of information from unintended users, interference and noise.12-11-2008
20100284442Authenticating a signal based on an unknown component thereof - Authentication of a signal, signal11-11-2010
20100284443Channel Estimation - A user terminal is configured to generate supplemental pilot symbols from data symbols transmitted to other user terminals meeting a predetermined reliability criterion. The supplemental pilot symbols can be used for channel estimation, covariance estimation, CQI estimation, or other purposes.11-11-2010
20100284441Receiver for GPS-like signals - A module for receiving a plurality of signals that are modulated with a common carrier, where each of the signals includes information that enables a determination of a distance from said receiver to a source that transmits the signal, and outputs to outside the module a digital representation of a downshifted replica of the received signals or, alternatively, outputs a stored and delayed version of the downshifted replica of the received signals together with information about the delay.11-11-2010
20110134969METHOD AND APPARATUS FOR PARALLEL PROCESSING TURBO DECODER - A receiver capable of decoding encoded transmissions. The receiver includes a number of receive antennas configured to receive data; a plurality of memory units that store the received data; and a plurality of decoders configured to perform a Turbo decoding operation. Each of the plurality of decoders decodes at least a portion of the received data using at least a portion of a decoding matrix. The receiver also includes a data switch coupled between the plurality of decoders and the plurality of memory units. The data switch configured to vary a decode operation from an long term evolution (LTE) based operation to a Wideband Code Division Multiple Access (WCDMA) operation.06-09-2011
20100215082ITERATIVE INTERFERENCE CANCELLER FOR WIRELESS MULTIPLE-ACCESS SYSTEMS EMPLOYING CLOSED LOOP TRANSMIT DIVERSITY - An interference-canceling receiver processes coded, multiple-access, spread-spectrum transmissions that propagate through frequency-selective communication channels from multiple transmit antennas to multiple receive antennas in a closed-loop transmit-diversity channel. The receiver provides for repeated use of symbol-estimate weighting, subtractive cancellation with a stabilizing step-size, and mixed-decision symbol estimation. Receivers may be designed, adapted, and implemented explicitly in software or programmed hardware, or implicitly in standard Rake-based hardware, either within a Rake receiver at the finger level or outside the Rake at the user or subchannel symbol level. The receiver may be employed in user equipment on the forward link or in a base station on the reverse link.08-26-2010
20120147929WIDEBAND MULTI-CHANNEL RECEIVER WITH FIXED-FREQUENCY NOTCH FILTER FOR INTERFERENCE REJECTION - A wideband multi-channel receiver comprises an antenna configured to receive a radio frequency band comprising an aviation VHF communication band, an aviation VHF navigation band, an aviation L-band, or combinations thereof. A band-pass filter is in signal communication with the antenna, and a low-noise amplifier is in signal communication with the band-pass filter. A mixer is in signal communication with the low-noise amplifier and is configured to translate a radio frequency band to an intermediate frequency (IF) band. A tunable local oscillator is in signal communication with the mixer. At least one fixed-frequency notch filter is in signal communication with the mixer, with the notch filter configured to reject at least one interference signal in the IF band while passing remaining signals in the IF band. An analog-to-digital converter is in signal communication with the notch filter and is configured to convert the remaining signals in the IF band to digital signals. A digital processing system is in signal communication with the analog-to-digital converter.06-14-2012
20110305262MIMO RECEIVER HAVING IMPROVED SIR ESTIMATION AND CORRESPONDING METHOD - A method and corresponding receiver product, the method comprising: receiving a plurality of data streams over a wireless multiple-input-multiple-output data channel, whereby each data stream is received at all of a plurality of receive antennas from all of a plurality of transmit antennas with a respective weighting having been applied to each stream as transmitted from each different transmit antenna; receiving a common pilot signal over a common pilot channel; receiving an indication of the weightings; extracting the individual data streams from the plurality received at the receive antennas; and using the weightings and the common pilot signal together with information regarding the extracted data streams to calculate, for each of the streams, an estimate of signal power relative to interference from the one or more others of said data streams.12-15-2011
20100322291Control Signaling for Multiple Carrier High Speed Uplink Packet Access in Radio Frequency Communication Systems - Systems and methods for providing an efficient mechanism for transmitting information needed to receive a secondary carrier over an existing message protocol on a primary carrier for a multiple carrier capable communications terminal. The receiver terminal may receive, on a primary carrier, a message containing information including a timing offset and a cell identification for a secondary carrier, for example. The communications terminal may then correlate a receiver to receive the secondary carrier without the need for a separate synchronization signal on the secondary carrier. These embodiments result in additional efficiency in a communications system.12-23-2010
20120039365METHODS AND APPARATUS TO ACTIVATE LOCATION MEASUREMENTS - Methods and apparatus to activate location measurements are disclosed. An example method disclosed herein for a wireless device to activate location measurements comprises receiving configuration information including one or more radio link failure criteria for activating a processor for performing stand-alone location measurements, and operating the processor in accordance with the configuration information.02-16-2012
20100215081DETERMINING CHANNEL COEFFICIENTS IN A MULTIPATH CHANNEL - A device, method, and computer-readable medium are provided. The device includes, but is not limited to, an antenna configured to receive a multipath signal and a processor operably coupled to the antenna to receive the multipath signal. The processor is configured to determine a training signal transmitted from a second device to create the received multipath signal; sample the received multipath signal; and determine channel coefficients based on the sampled multipath signal and the determined training signal using a mixed-norm convex optimization process, wherein the channel coefficients characterize a channel associated with the multipath signal.08-26-2010
20120063490CONVOLUTIONALLY ENCODING AND DECODING MULTIPLE DATA STREAMS - A plurality of data streams are convolutionally encoded. Each convolutionally encoded data stream has a particular data rate. The particular data rate of each data stream is adjusted so that an adjusted data rate of that data stream matches a data rate of a CDMA transmission. When the particular data rate of one of the data streams is below the data rate of the CDMA transmission, data of the one data stream is repeated to match the data rate of the CDMA transmission. The adjusted data rate data streams is transmitted as the CDMA transmission. The adjusted data streams are transmitted together in the CDMA transmission and the CDMA transmission is quadrature modulated.03-15-2012
20110158293NOISE AND CHANNEL ESTIMATION USING LOW SPREADING FACTORS - Noise measurements are made within a fraction of a single symbol period of a longest orthogonal code symbol. A control processor identifies an unoccupied code having a spreading factor that is less than a longest spreading factor for the system. A despreader measures symbol energy based on the unoccupied code and a noise estimator generates noise estimations based on the measured symbol energies. The subscriber station uses similar techniques in order to perform channel estimations within a period that is a fraction of a symbol period of a longest-spreading-factor code06-30-2011
20110158292TRANSMITTING SPREAD SIGNAL IN COMMUNICATION SYSTEM - The present invention provides for transmitting a spread signal in a mobile communication system. The present invention includes spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set.06-30-2011
20100135364RECEIVER OF MULTIPLEXED BINARY OFFSET CARRIER (MBOC) MODULATED SIGNALS - A receiver for receiving a navigation signal comprising a carrier modulated by a code modulation function of a given code rate and further modulated by a composite sub-carrier modulation function having first and second components with two different rates both of which arc different to the code rate, the receiver comprising processing means arranged to: generate a first estimate of delay based on the code modulation only; generate a second estimate of delay based on the first component of the sub-carrier modulation only; and generate a third estimate of delay based on the second component of the sub-carrier modulation only; and determine a further delay estimate from the first second and third delay estimates.06-03-2010
20120027052Method and System for Achieving Space and Time Diversity Gain - Certain aspects of a method and system for achieving space and time diversity gain are disclosed. Aspects of one method may include modifying a generalization code of at least one pilot channel, to measure signal strengths for each of a plurality of received multipath signals. A portion of the plurality of received multipath signals may be combined based on the measured signal strengths. The signal strengths of the plurality of received multipath signals may be measured on a primary pilot channel by assigning its generalization code to zero. The signal strengths of the plurality of received multipath signals on a secondary pilot channel may measured by assigning its generalization code to a non-zero value.02-02-2012
20120314733METHOD OF ESTIMATING PSEUDORANGE, GNSS RECEIVING APPARATUS, AND MOBILE TERMINAL - A pseudorange is estimately calculated in high accuracy without being influenced by multipath. Multipath is determined based on a C/No and a difference value DV(iv) that is a difference value between a time change of an observed pseudorange and a delta range (S12-13-2012
20100290506SPREADING CODE ACQUISITION FOR DIRECT SEQUENCE SPREAD SPECTRUM SIGNALS - The invention relates to a method and apparatus for acquiring a complex spreading code of a direct sequence spread spectrum signal (DSSS) by acquiring a state of a spreading code generator capable of generating the complex spreading code. A sequence of bipolar differential product values, which sign is independent on data transmitted by the DSSS signal, is obtained by combining in-phase and quadrature samples of the DSSS signal for adjacent chip intervals. This sequence is provided to a linear block decoder for obtaining a codeword of a linear block code, which is defined by a structure of the spreading generator and the differential product operation. The codeword is used to compute the state of the spreading code generator.11-18-2010
20100189164METHOD AND APPARATUS FOR EXTRACTING DATA FROM MULTI-CARRIER SIGNALS, METHOD OF USING THE DATA EXTRACTION METHOD, GLOBAL NAVIGATION SATELLITE SYSTEM RECEIVER USING THE DATA EXTRACTION METHOD, AND MACHINE-READABLE STORAGE - A method is provided for extracting data signals having different carrier frequencies. At least three data signals are received, a lowest carrier frequency being f07-29-2010
20110128999Multi-Frequency Band Receiver - A multi-frequency band receiver has a first path configured to process first and second frequency bands, and a second path configured to process a third frequency band, the first and second frequency bands having a smaller distance than the first and third frequency bands, and having a smaller distance than the second and third frequency bands. In addition, the multi-frequency band receiver has an oscillator stage for providing a local oscillator signal having a frequency that is between the center frequencies of the first and second frequency bands, the first path having a mixer that may be supplied with the local oscillator signal, and the second path having a mixer that may also be supplied with the local oscillator signal. In addition, the multi-frequency band receiver has a baseband stage for processing output signals of the first and second paths so as to obtain a receive signal.06-02-2011
20100246643SYSTEM AND METHOD FOR HUMAN BODY COMMUNICATION USING LIMITED PASSBAND - Provided are a system and method for human body communication using a limited passband. The system includes a transmission frame generating unit for human body communication which generates a transmission frame for human body communication based on data information including user identification (ID) and data scrambled into an orthogonal code generated by the user ID; a symbol mapping unit for symbolizing the generated transmission frame for human body communication according to a predetermined modulating method; a spreading unit for spreading the symbol outputted in the symbol mapping unit; a waveform generating unit for generating a baseband signal whose band is limited to a predetermined range with respect to the data spread in the spreading unit; and a middle band transmitting unit for modulating the baseband signal into a predetermined limited passband signal.09-30-2010
20120213251CONFIGURABLE ALL-DIGITAL COHERENT DEMODULATOR SYSTEM FOR SPREAD SPECTRUM APPLICATIONS - A configurable all-digital coherent demodulator system for spread spectrum digital communications is disclosed herein. The demodulator system includes an extended and long code demodulator (ELCD) coupled to a traffic channel demodulator (TCD) and a parameter estimator (PE). The demodulator also includes a pilot assisted correction device (PACD) that is coupled to the PE and the TCD. The ELCD provides a code-demodulated signal to the TCD and the PE. In turn, the TCD provides a demodulated output data signal to the PE. The PACD corrects the phase error of the demodulated output data based on an error estimate that is fed forward from the PE. Accumulation operations in the ELCD, TCD, and PE are all programmable. Similarly, a phase delay in the PACD is also programmable to provide synchronization with the error estimate from the PE.08-23-2012
20090060007Fast joint detection base station - A code division multiple access base station receives K data signals over a shared spectrum. The base station receives and samples a combined signal having the K transmitted data signals. A combined channel response matrix is produced. A block column of a cross correlation matrix is determined using the combined channel response matrix. Each block entry of the block column is a K by K matrix. Each block entry of the block column is a K by K matrix. A fourier transform of a complex conjugate transpose of the combined channel response matrix multiplied to the combined signal samples is taken. An inverse of a fourier transform of each block entry is multiplied to a result of the fourier transform to produce a fourier transform of the data vector. An inverse fourier transform of the data vector fourier transform is taken to produce data of the K signals.03-05-2009
20090060006RECEIVER DETECTING SIGNALS BASED ON SPECTRUM CHARACTERISTIC AND DETECTING METHOD THEREOF - A receiver for receiving a target signal complying with a specific communication specification comprising a specific spectrum characteristic includes a detecting module for detecting a packet of an input signal, a transforming unit for transforming the packet from a time domain to a frequency domain to derive a spectrum characteristic of the input signal, and a determining unit for determining whether the input signal is the target signal according to the spectrum characteristic of the input signal. Therefore, the proposed receiver is able to reduce packet miss rate and false alarm rate while robust to a severe channel condition, and achieve fast and accurate signal quality detection.03-05-2009
20110188547SYSTEM AND METHOD FOR ANTENNA SELECTION - Systems and methods that provide antenna selection in multi-antenna-element communication systems are provided. In one embodiment, a system that selects N antenna elements in an M-antenna-element transmitter or an M-antenna-element receiver, in which N is less than M, may include, for example, M antenna elements in the M-antenna-element transmitter or the M-antenna-element receiver; N RF chains; and a switch coupled to the N RF chains. The M-antenna-element receiver may determine a bit error rate for each possible N antenna element subset of the M antenna elements. The M-antenna-element receiver may determine the particular N antenna element subset with a lowest bit error rate. In response to the determination of the particular N antenna element subset with the lowest bit error rate, the switch may couple the N RF chains to the particular N antenna element subset with the lowest bit error rate.08-04-2011
20120250732Technique for Searching for a Preamble Signal in a Spread Spectrum Signal Using a Fast Hadamard Transform - In one embodiment, a method for demodulating and searching for a preamble signal containing a complex phasor signal is disclosed. The complex phasor is demodulated using a phasor-rotated fast transformer. A received signal is correlated with a spreading code to produce a correlated signal. The correlated signal is coherently accumulated to produce a coherently accumulated signal. A first phasor-rotated signal transformation is performed on a real component of the coherently accumulated signal, and a second phasor-rotated signal transformation is performed on an imaginary component of the coherently accumulated signal. Finally, the signal power of the transformed real and imaginary components of the coherently accumulated signal is determined.10-04-2012
20100027588Content Transfer - Content transfer between nodes in a communications network is required in many situations. For example, between fixed nodes in a data center, between a fixed node such as a base station and a mobile node such as a mobile telephone and between mobile nodes themselves such as personal digital assistants. In an embodiment a content transfer process for use between nodes where one node knows the size of content to be transferred is described. For example, a file is divided into blocks to be sent between the nodes. A node receiving a block keeps a record of the received blocks and sends that record to the sending node at certain times. By controlling the times at which the records are sent the number of messages that need to be sent to transfer the records is low and the blocks are transferred in an efficient manner.02-04-2010
20120257651METHOD AND APPARATUS TO IMPROVE SENSITIVITY OF DECODING TIME OF A GLOBAL NAVIGATION SATELLITE SYSTEM RECEIVER - A method and an integrated circuit to improve sensitivity of decoding time of a GNSS receiver are disclosed. A plurality of estimates of states of an encoder for one or more instances of a time counter is maintained. A signal comprising a plurality of data bits corresponding to an instance of the time counter is detected and at least one augmented state for each estimate of states of the encoder is determined. A corresponding augmented state for successive instances of the time counter is predicted and an augmented branch metric for each of the at least one augmented state is computed. A path metric for the each estimate is updated based on the augmented branch metric for each of the at least one augmented state and a time counter value is determined based on the path metric for the each estimate.10-11-2012
20120082189METHOD AND SYSTEM FOR SINGLE ANTENNA RECEIVER SYSTEM FOR WCDMA - A receiver receives chip-level data items via a plurality of individual distinct path signals in a signal cluster that is wirelessly received. Channel estimates and timing reference signals, and lock indications of valid components values in the channel estimates are generated utilizing the received chip-level data items. Rake receiver fingers are assigned to the received individual distinct path signals based on the generated channel estimates and timing reference signals, and/or the lock indications. Each of the received chip-level data items corresponds to one of the assigned rake receiver fingers. At least a portion of the received chip-level data items may be combined utilizing the assigned rake receiver fingers. The generated one or more combined chip-level data items may be despreaded to generate corresponding symbol-level data.04-05-2012
20120269237DATA DETECTION FOR CODES WITH NON-UNIFORM SPREADING FACTORS - A plurality of communication signals is received. Each communication signal has an associated code. At least two of the communication signals have a different spreading factor. The associated codes have a scrambling code period. A total system response matrix has blocks. Each block has one dimension of a length M and another dimension of a length based on in part M and the spreading factor of each communication. M is based on the scrambling code period. Data of the received plurality of communication signals is received using the constructed system response matrix.10-25-2012
20100232476APPARATUS AND METHOD FOR USE IN GLOBAL POSITIONING MEASUREMENTS - Embodiments of the invention involve providing assistance data to a global position and navigation receiver, for example topographical data, such that the receiver can decide on a specific action depending on that data. The topographical data may include one or both of geographical data and architectural data. Geographical data may include information about natural formations, such as hills, valleys, forests, etc. Architectural data may include manmade formations, such as streets, buildings, bridges, etc. The receiver may then interpret and decide on a course of action for controlling the receiver base on the assistance data.09-16-2010
20100202496RECONFIGURABLE TRANSFORM DOMAIN RECEIVER - A system is provided. The system comprises a transform domain radio receiver comprising a plurality of reconfigurable processing paths coupled to a radio frequency signal input, each reconfigurable processing path implementing a down converter, a low-pass filter, and an integrator and wherein a frequency selectivity of the processing path is reconfigurable. The system also comprises a control unit to configure a frequency selectivity of the plurality of parallel reconfigurable processing paths.08-12-2010
20130022087METHOD, APPARATUS AND SYSTEM FOR CONFIGURING DEMODULATION REFERENCE SIGNAL - A method, an apparatus and a system for configuring a Demodulation Reference Signal (DMRS) are disclosed in the present invention. The method includes: receiving a DMRS indication index transmitted from a network side; determining at least one port used for the local transmission of the DMRS; acquiring the predetermined DMRS configuration parameters corresponding to the DMRS indication index and the at least one port, and configuring, according to the DMRS configuration parameters, the DMRS to be transmitted from the at least one port. Therefore, the terminal can implement the configuration of the DMRS without reloading the corresponding configuration information. Thus, the implementation complexity of the DMRS configuration flow is decreased, and the operation load of the terminal is also reduced.01-24-2013
20080225928Pseudorandom Noise Code Acquisition in Direct Sequence Spread Spectrum Systems - A method for receiving spread spectrum signals and for initial code acquisition from the received signals comprises de-spreading the received signals, based on code phase synchronization, to produce a de-spread signal; and performing a modulation detection based on a change of time-domain characteristic of the de-spread signal.09-18-2008
20120250731SYSTEMS AND METHODS FOR MONITORING A WIRELESS NETWORK - Systems, methods, and devices to enable monitoring of wireless networks are described herein. In some aspects, a low power receiver or a receiver operating in a low power mode scans for signals with a moderate or low duty cycle. If a signal identifying a device or user of the receiver, or a signal indicating that there will be a subsequent data communication, is received, a high power receiver or a receiver operating in a high power mode is activated to receive data communications.10-04-2012
20130114645Method and Apparatus for Start of Frame Delimiter Detection - The present disclosure is related to detecting a start frame delimiter. A received data packet is correlated with a known sequence, which provides a first correlation result. The received data packet is correlated with a predefined sequence, which yields at least a second correlation result. The data packet comprises at least a preamble portion and a header portion, whereby the preamble portion comprises the start frame delimiter. The predefined sequence is determined according to the preamble pattern. The method further comprises of comparing the first correlation result with the second correlation result and comparing the first correlation result with a given threshold. The process of correlating will be continued until two criteria are met: the first correlation result is larger than the threshold and larger than the at least second correlation result. Only then it is decided that the start of frame delimiter pattern has been detected.05-09-2013
20130094539SEMICONDUCTOR DEVICE, RECEIVER, TRANSMITTER, TRANSCEIVER AND COMMUNICATION SYSTEM - A semiconductor device includes: a clock and data recovery unit to which a receive signal is inputted and which extracts, based on an operation clock signal, a clock signal and a data signal from the receive signal; a frequency error adjusting unit which generates a frequency error signal indicating a frequency error between the clock signal extracted from the receive signal and the operation clock signal; a frequency error signal storage unit which stores the frequency error signal; an operation clock generation unit which controls, based on the frequency error signal, a frequency of the operation clock signal; and an SSCG unit which, based on the value of the frequency error signal stored in the frequency error signal storage unit, varies the operation clock signal generated by the operation clock generation unit by spreading the spectrum of the operation clock signal.04-18-2013
20130094540Methods And Apparatus For Reducing A Sampling Rate During A Sampling Phase Determination Process - Techniques for use in sampling a signal of a receiver are described. In a sampling determination mode, a signal is sampled at a first sampling period for producing a sample set for each phase of the sampled signal. For each sample set, a correlation process is performed for producing a correlation result. One of the phases associated with an optimal correlation result is identified from the correlation results. In a communication mode, a received signal is sampled at a second sampling period at the phase associated with the optimal correlation result, for recovering user or signaling information from the received signal. The second sampling period is less than the first sampling period.04-18-2013
20130114646RECEIVER APPARATUS, RECEPTION METHOD AND COMPUTER PROGRAM - A receiver apparatus including a receiving unit that receives a global positioning system (GPS) signal from a satellite in a GPS, a multiplying unit that multiplies the GPS signal received by the receiving unit by pseudo navigation data and an integrating unit that performs a synchronous addition on a signal, in which navigation data is removed from the GPS signal, serving as an output from the multiplying unit.05-09-2013
20080198905Method and Apparatus for Despread Data in Wireless Communication System - The present invention provides a method for despreading spread signal used in a receiver of a wireless communication system, comprising the steps of: preprocessing spread signal to derive a group of spreading chips corresponding to a data symbol; processing Hie spreading chips to extract cophase components and orthogonal components of each of the spreading chips; and converting and combining the group of cophase components and orthogonal components according to a preset selecting signal to derive a group of despreading chips. The present invention further provides an apparatus for carrying out the above-mentioned method, which significantly simplifies the design of a dispreading circuit and reduces the area of the dispreading circuit08-21-2008
20130148697TRANSMITTING SPREAD SIGNAL IN COMMUNICATION SYSTEM - The present invention provides for transmitting a spread signal in a mobile communication system. The present invention includes spreading a signal using a plurality of spreading codes, wherein the plurality of spreading codes have a spreading factor, multiplexing the spread signal by code division multiplexing, transmitting the multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a first antenna set, and transmitting the same multiplexed signal via a plurality of neighboring frequency resources of one OFDM symbol of a second antenna set.06-13-2013
20130148698TRANSMITTING SPREAD SIGNAL IN COMMUNICATION SYSTEM - The present invention provides for spreading a first signal using a plurality of spreading codes, multiplexing the first spread signal by code division multiplexing, transmitting the first multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol of a first antenna set, spreading a second signal using a plurality of spreading codes, multiplexing the second spread signal by code division multiplexing, transmitting the second multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol of the first antenna set, transmitting the first multiplexed signal via a plurality of neighboring frequency resources of an OFDM symbol of a second antenna set, and transmitting the second multiplexed signal via a plurality of neighboring frequency resources of the OFDM symbol of the second antenna set, wherein the first multiplexed signal is transmitted on frequency resources that neighbor frequency resources that the second multiplexed signal is transmitted on.06-13-2013
20100316093METHOD FOR DETECTING SIGNALS BASED ON DESPREADING AND METHOD FOR TRANSMITTING SIGNALS FOR THE SAME - A method for detecting signals based on despreading and a signal transmitting method for the same are disclosed. Signals are spread according to the size of at least one spreading band, which is determined in consideration of a correlation degree of a frequency band in a communication system. A reception side which receives the signals detects the signals after despreading with respect to signals which are spread in a frequency band having a correlation degree equal to or greater than a predetermined level as a spreading band, among the reception signals. Thus, the dimension of the detected signals can be decreased.12-16-2010
20120281732INTEGRATED CIRCUIT FOR RESPONSE SIGNAL SPREADING - A wireless communication apparatus capable of minimizing the degradation of the separation characteristic of response signals to be code-multiplexed. In the apparatus, a control part (11-08-2012
20130188669Code Channel Detecting Method and Related Device and Communication System - Embodiments of the present invention disclose a code channel detecting method and a related device and a communication system. In the solutions provided by the embodiments of the present invention, whether a DPA code channel is in an active state is determined with multiple thresholds based on a first reference value and a third reference value, or based on a first reference value, a second reference value and a third reference value. This mechanism takes multiple possible false determination situations into consideration, thereby ensuring a code channel correct detection rate in multiple interference scenarios and relatively reducing a false alarm rate.07-25-2013
20130188668MULTIPATH SEARCHING METHOD AND MULTIPATH SEARCHER - Embodiments of the present invention provide a multipath searching method and a multipath searcher, to improve accuracy of delay estimation, thereby improving performance of a receiver. The method includes: performing processing on received signals r07-25-2013
20130202014DSSS Preamble Detection for Smart Utility Networks - Embodiments of the invention provide a method to detect DSSS preambles in smart utility networks. A DSSS signal is received by a receiver and a digital sequence of samples is formed. A difference value is calculated between pairs of samples in the digital sequence of samples to form a sequence of differential values. A known preamble differential value sequence is correlated with the sequence of differential values to form a sequence of correlation values. A location of the preamble is located in the digital sequence of samples corresponding to a peak in the sequence of correlation values that exceeds a threshold value.08-08-2013
20120300815HYBRID SPACE SYSTEM BASED ON A CONSTELLATION OF LOW-ORBIT SATELLITES WORKING AS SPACE REPEATERS FOR IMPROVING THE TRANSMISSION AND RECEPTION OF GEOSTATIONARY SIGNALS - The remote communications system, intended for low-throughput data transfer between at least two users located substantially on the surface of a celestial body, includes: 11-29-2012
20130208766Data Detection and Receiver Circuit - A method includes a first step of receiving a signal at a first receiver circuit on the basis of a mobile communications standard supporting multiple predefined modulation alphabets wherein the received signal includes first data dedicated to the first receiver circuit and second data dedicated to a second, different receiver circuit, a second step of determining a modulation alphabet of the multiple predefined modulation alphabets during an operation of the first receiver circuit and a third step of detecting data depending on the second data at the first receiver circuit on the basis of the determined modulation alphabet.08-15-2013

Patent applications in class Receiver

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