Class / Patent application number | Description | Number of patent applications / Date published |
370479000 | Combining or distributing information via code word channels | 48 |
20080267220 | Method of Iterative Signal Processing For Cdma Interference Cancellation and Ising Perceptrons - A method of processing a signal to infer a information encoded in the signal, measuring characteristics of the signal, making an estimate of the information from measured signal characteristics, using an expanded set of information, the expanded set of information being correlated to the measured signal characteristics, determining an update rule and applying the update rule to the expanded set of information to generate an inferred set of information representative of that encoded in the signal. The method may be used in many applications, for example inferring information in CDMA signals, learning in an Ising perceptron and lossy compression. | 10-30-2008 |
20080310455 | Multi-Code-Set Channel Estimation Method in a Time-Slot Cdma System - A multi-code-set channel estimation method in a time-slot CDMA system having steps of: A. performing uni-code-set channel estimations and obtaining channel estimation result; B. extracting a maximum interference tap from the channel estimation result; C. reproducing interference components suffered respectively by response signals corresponding respectively to the plurality of code-sets from the maximum interference tap; D. canceling the interference components, and obtaining a pure channel estimation result of a signal corresponding to each code-set; E. determining whether a predetermined number of iterations has been performed, if so, outputting the result of each uni-code-set channel estimation; otherwise, taking the pure channel estimation result of the signal corresponding to each code-set as the channel estimation result of the code-set to be processed in the next iteration, and returning to step B. Due to the present invention, a multi-code-set joint channel estimation with high performance can be implemented simply and effectively. | 12-18-2008 |
20080317066 | VOTING COMPARATOR METHOD, APPARATUS, AND SYSTEM USING A LIMITED NUMBER OF DIGITAL SIGNAL PROCESSOR MODULES TO PROCESS A LARGER NUMBER OF ANALOG AUDIO STREAMS WITHOUT AFFECTING THE QUALITY OF THE VOTED AUDIO STREAM - A method and apparatus for selecting a preferred signal from homogenous streams of a subscriber call in an analog or mixed mode wireless communication network. The method and apparatus have particular significance to un-decoded analog radio packets which require digital signal processing to decode at least their signaling information. The method allocates at least one stream with the best signal qualities to real-time full-decoding in a DSP, and allocates lower quality streams to non-real time burst decoding in the same or another DSP. As signaling quality changes in the homogenous streams, the full-decoding can be re-allocated to a now higher quality stream. Burst decoding lower quality streams allows for more efficient use of DSP processing power and allows more streams to be processed without significant affect on audio content or quality. | 12-25-2008 |
20090028190 | DEVICE AND METHOD OF CONSTRUCTING GENERATION MATRIX FOR LINEAR BLOCK CODING, CODING DEVICE AND DECODING DEVICE USING THE GENERATION MATRIX - A method of constructing a generation matrix of a linear block code. The method includes setting a number of relation lines connected for respective codeword packet nodes if a number of massage packet nodes and the number of codeword packet nodes are selected; setting a number of relation lines connected for the respective message packet nodes; connecting the message packet nodes and the codeword packet nodes with the relation lines, the number of which is as many as the set number; and constructing the generation matrix of the linear block code based on the connection relation between the message packet nodes and the codeword packet nodes. Accordingly, the generation matrix for effectively performing a linear block coding of a message in the unit of a packet can be constructed. | 01-29-2009 |
20090041059 | TRANSMISSION AND RECEPTION SYSTEM AND METHOD BASED ON CODE DIVISION - The code division (CDMA) transmission method includes the step of multiplying a signal (a) to be transmitted, represented by a vector, by a matrix (S), whose result is represented by a vector (x), said method being characterized in that: • taking a basic sequence with substantially-ideal periodic autocorrelation; • constructing said matrix (S) by a cyclical translation of said basic sequence, in such a way that the columns of said matrix (S) are the cyclical shifts of the basic sequence; • adding a cyclic prefix to said resulting vector (x). | 02-12-2009 |
20090103567 | Code division multiplex transmitting and receiving apparatus and method - A code division multiplex transmitting and receiving apparatus has a transmitting apparatus with two coders per channel and terminal units with two matched filters each. One coder and one matched filter employ one spreading code; the other coder and the other matched filter employ another spreading code. The two coded signals output in parallel by the two coders are converted to a single serial signal before being multiplexed. The two matched filters sample alternate chips in the multiplexed signal. The two coders can be supplied with different data signals to double the transmission capacity, or with the same data signal to double the transmission distance. The outputs of the two matched filters are processed separately in the former case and are combined in the latter case. | 04-23-2009 |
20090103568 | Method and System for Non-Gaussian Code-Division-Multiple-Access Signal Transmission and Reception - The present invention relates to a method and system for non-Gaussian code-division-multiple-access signal transmission and reception. Input probability data indicative of a non-equiprobable channel input probability mass function are determined based on received channel data indicative of characteristics of a CDMA transmission channel. The input probability data are determined such that a transmission signal received after transmission has a non-Gaussian distribution. Upon receipt of input user data, a CDMA signal is generated by modulating the received user input data in dependence upon the input probability data and provided for transmission. After transmission a received transmission signal is first processed for determining second channel data and then for determining an estimate indicative of the user input data based on the second channel data. | 04-23-2009 |
20090110005 | SWITCHING CIRCUIT AND SWITCHING METHOD - Timing control means receives a plurality of data that have been input in parallel and adjusts the timings of a plurality of the data so that data having the same destination do not exist at the same timing. Multiplexing means generates a multiple signal by multiplying the data whose timings have been adjusted in the timing control means by an orthogonal code that has been determined for each destination and then by multiplexing data being at the same timing together. Separating means extracts a datum for each destination from the multiple signal, by multiplying the multiple signal by an orthogonal code for each destination. | 04-30-2009 |
20090180495 | Method for Transmitting Data, Method for Receiving Data, Transmitter, Receiver, and Computer Program Products - A method for transmitting data comprising a plurality of bits is described wherein the data is mapped to a plurality of modulation symbols, each modulation symbol comprising at least one more significant bit and at least one less significant bit, at least one parity bit is generated for the plurality of bits and the plurality of bits are mapped to more significant bits of the plurality of modulation symbols and the at least one parity bit is mapped to at least one less significant bit of the plurality of modulation symbols. | 07-16-2009 |
20090245288 | Techniques for Reducing Interference in a Communication System - A technique of operating a communication device includes identifying a signal null associated with a signal to be transmitted on a first communication channel. A channel gain of the first communication channel is adjusted at a time that substantially coincides with the signal null to reduce transient noise spectrum coupled from the first communication channel to one or more second communication channels. | 10-01-2009 |
20090268757 | Data transmission apparatus and data transmission method - An input signal INDATA inputted to a sender-side interface portion is encoded by an encoder, and a transmission signal generated by the encoding is transmitted to a receiver-side interface portion through two signal transmission lines. The input signal INDATA is encoded in such a manner that the logic level of the transmission signal transmitted through at least one of the two signal transmission lines is changed in any two consecutive elementary periods. The receiver-side interface portion is provided with a clock receiver, and a clock signal is generated based on the change of the transmission signals supplied from the two signal transmission lines. | 10-29-2009 |
20090279571 | DIVERSITY PROXIMITY COMMUNICATION - A diversity proximity communication system formed on two juxtaposed chips, one having a two-dimensional array of transmit elements, the other having a two-dimensional array of receive elements. The receive and transmit elements need not be aligned and may have nominal alignment of one transmit element overlapping the corners of four receive elements. The elements may be electrical pads capacitively coupled across the interface. Signals of four different multiplexing groups, e.g., time-multiplexed, are supplied to transmitting elements in a 2×2 array. Signals from four receive elements in a 2×2 array are amplified, combined, and demultiplexed for the selected multiplexing group. The gains for the four signals to be combined are differentially controlled to increase the signal-to-noise ratio. The amplification may be determined by the overlap between each of the receive elements and the transmit element of the selected multiplexing group. | 11-12-2009 |
20100034220 | Successive interference canceling for CDMA - Successive interference canceling for CDMA. ICI may result from a signal's multi-path effects, or by filtering/suppression of some of the component energy of the signaling waveforms. Energy component attenuation destroys orthogonality of CDMA symbols thereby causing ICI. An ICF suppresses frequency domain portions (attenuates ingress), but also introduces ICI. Following the ICF, the signal is de-spread, sliced, re-spread and convolved with the ICF echoes (except first tap echoes). Convolving re-spread hard decisions with delayed ICF taps is equivalent to partially re-modulating the first-pass hard decisions to efficiently “add-back-in” the signal energy which was blanked/subtracted by the ICF. Alternatively, parameter estimation de-rotates and re-rotates soft symbols and hard decisions, respectively, compensating for undesirable symbol rotation. The convolved signal is subtracted from a delayed version of the ICF output signal. If desired, this process may be repeated successively to enhance the accuracy of the obtained data decisions in the next stage. | 02-11-2010 |
20100040088 | MULTIPLEXING CHANNELS BY A MEDIUM ACCESS CONTROLLER - A code division multiple access (CDMA) communication device comprises a medium access controller (MAC) configured to receive data from a plurality of channels. Each channel is associated with a priority and an identifier. The MAC is further configured to multiplex the data of the plurality of channels for transmission over a CDMA channel based on the priority. | 02-18-2010 |
20100040089 | METHOD AND SYSTEM FOR REDUCTION OF PEAK-TO-AVERAGE POWER RATIO OF TRANSMISSION SIGNALS COMPRISING OVERLAPPING WAVEFORMS - The present invention provides a method and system for reducing the peak to average power ratio (PAP) of a signal with low computational complexity. According to one embodiment, the present invention is applied to reduce the PAP of an OFDM signal. According to an alternative embodiment, the present invention, is applied to reduce the PAP of a CDMA signal. Rather than seeking the optimum solution, which involves significant computational complexity, the present invention provides for a number of sub-optimal techniques for reducing the PAP of an OFDM signal but with much lower computational complexity. In particular, according to one embodiment utilizing the PTS approach, an iterative technique is used to assign phase factors to each of a set of partial transmit sequences from a set of possible phase factors. Experimental results using the iterative technique showed only a slight degradation (1 dB) from the optimal approach using the same number of subblocks and subcarriers. In an alternative embodiment, which avoids feedback required by the iterative approach, a sequence of phase factors are generated randomly and assigned to each of a set of partial transmit sequences. This procedure is repeated for a pre-determined number of trials and the random sequence generating the lowest PAP is selected. In a third embodiment, a set of phase factors is generated using a structured sequence such as a Walsh sequence. | 02-18-2010 |
20100067550 | Code division multiplex signal transmitter and code division multiplexing method with amplifying circuits reduced in number - N channels of encoded data are added into added data, which is compared with a first threshold of 2 | 03-18-2010 |
20100067551 | Method for Providing Packet Framing in a DSSS Radio System - An improved method of framing data packets in a direct sequence spread spectrum (DSSS) system that uses one pseudo-noise code (PN-Code) to frame the packet with a start-of-packet (SOP) and end-of-packet (EOP) indicator, and a different PN-Code to encode the data payload. Furthermore, the SOP is represented by the framing PN-Code, and the EOP is represented by the inverse of the framing PN-Code. This method creates a robust framing system that enables a DSSS system to operate with a low threshold of detection, thus maximizing transmission range even in noisy environments. Additionally, the PN-Code used for the SOP and EOP indicators can be used to indicate an acknowledgement response. | 03-18-2010 |
20100150178 | Propagation delay time adjustment method, propagation delay time adjustment system, propagation delay time adjustment device, storage medium stored with propagation delay time adjustment program, and node device - There is provided a propagation delay time adjustment method for adjusting the propagation delay time occurring within a reception circuit for each channel of a center node device configuring a 1-to-N communications system in which communication is performed between the center node device and N (N being an integer of 2 or more) individual edge node devices using a Synchronous Code Division Multiplexing method, the center node device comprising a main control section, and each of the edge node devices comprising an auxiliary control section that controls the propagation delay time in cooperation with the main control section, the transmission delay time adjustment method comprising: transmission permission signal transmitting; transmission controlling; reception phase controlling; reception validity determining; optimum reception phase determining; and reception phase setting in which the main control section sets the optimum reception phase as the reception phase for the reception circuit. | 06-17-2010 |
20100195669 | MULTI-CHANNEL CODE-DIVISION MULTIPLEXING IN FRONT-END INTEGRATED CIRCUITS - A challenging problem is maintaining low power consumption in multi-channel (MC) systems, where multiple input signals demand several front-end analog signal-processing blocks to be replicated. A code-division multiplexing (CDM) system can be generalized as a signal compression-decompression involving an analog-to-digital converter (ADC). This invention utilizes CDM in MC front-end integrated circuits to significantly reduce the power consumption of such systems. The invention also extends CDM's data compression advantages to uncorrelated and weakly correlated MC signals through the introduction of a new Multi-Channel Signal Binning and Multiplexing (MCSBM) method and architecture. The proposed method achieves significant reductions in power consumption in comparison to a conventional time-division multiplexing quantizer, while adding only a modest amount of overhead and complexity. Among other advantages, the invention permits architects to fabricate MC integrated circuits with ultra low power consumption and small chip area, where conventional architectures could not. Another embodiment of the invention relates to the system's compressor organizing samples of the input signal in such a way that the downstream ADC quantizes the higher variance samples with a higher resolution compared to the resolution it uses to quantize other samples with lower variance. | 08-05-2010 |
20100284427 | METHOD, COMMUNICATION APPARATUS FOR TRANSMITTING DATA IN A COMMUNICATION SYSTEM AND THE COMMUNICATION SYSTEM - A method, a communication device for transmitting data in a communication system, and the communication system. The method includes: detecting the current channel quality; determining the overlapping coding times corresponding to the detected channel quality according to the corresponding relation between the channel quality and the overlapping coding frequency; performing coding operation of overlapping coding multiplexing technique to the data which is to be transmitted using the determined overlapping coding times and transmitting the coded data. The method improves the reliability of data transmission under the circumstance of channel quality being relatively poor, and improves the transmission efficiency, avoids the resource waste under the circumstance of channel quality being better. | 11-11-2010 |
20100303099 | POINT-TO-POINT COMMUNICATIONS SYSTEMS PARTICULARLY FOR USE IN POWER DISTRIBUTION SYSTEM - A point-to-point communications system ( | 12-02-2010 |
20110007757 | DETERMINISTIC ROTATIONAL CODING - A system and method for implementing a network encoding scheme includes buffering a signal in quantized form at a node of a network and permuting the signal into a particular order of code blocks. The code blocks are rotated using at least one key which has been assigned to the node, wherein the at least one assigned key is a value which is used to control the amount of rotation. The rotated code blocks are then combined to generate a combined signal. The combined signal is permuted back to generate at least one output signal. | 01-13-2011 |
20110080923 | Interference Suppression for CDMA Systems - Interference is cancelled from a baseband signal by synthesizing interference from estimated symbols in interfering subchannels. The estimated symbols are hard-coded, soft weighted, or zeroed, depending on the value of an estimated pre-processed signal-to-interference-and-noise ratio (SINR) in each subchannel in order to maximize a postprocessed SINR. The estimated pre-processed SINR is obtained from averages of estimated symbol energies and estimated noise variances, or from related statistical procedures. | 04-07-2011 |
20110110384 | METHOD AND RECEIVER FOR THE MULTI-PATH DETECTION IN CODE DIVISION MULTIPLE ACCESS SYSTEM - A method for the multi-path detection in code division multiple access system is provided, and the method includes the following step: A, initially detecting multi-path for the sample points in the searching area, obtaining the sample points for processing peak detection ( | 05-12-2011 |
20110116515 | SYSTEM AND METHOD FOR DEMODULATING AND DECODING A DIFFERENTIALLY ENCODED CODED ORTHOGONAL FREQUENCY DIVISION MULTIPLEXING MODULATION CODE USING TWO-DIMENSIONAL CODE BLOCKS - A system and method for demodulating and decoding a differentially encoded modulation code from a coded orthogonal frequency division multiplexing (COFDM) transmitter involves partitioning the differentially encoded modulation code into two-dimensional code blocks and demodulating and decoding the two-dimensional code blocks to produce demodulated and decoded information. | 05-19-2011 |
20110122894 | CAPTURE FREQUENCY DECISION METHODS AND RECEIVERS - A capture frequency decision method of deciding a capture frequency by executing a frequency search in which a correlation operation on a received signal, which is a CDMA (Code Division Multiple Access) signal, is performed at a plurality of search frequencies, includes: executing a first frequency search; setting a frequency for a side lobe check on the basis of a correlation integration time used in the first frequency search; selecting a plurality of search frequencies including the frequency for a side lobe check on the basis of a result of the first frequency search; executing a second frequency search of performing the correlation operation at the plurality of selected search frequencies; and deciding a capture frequency by executing a third frequency search using a result of the second frequency search. | 05-26-2011 |
20110170562 | Method and Apparatus for Channel Estimation and Detection in MIMO System - The prevent invention provides a method for performing channel estimation and detection in a Multiple-Input-Multiple-Output (MIMO) system, including: generating a demodulation reference signal, DM-RS, pattern for an extended cyclic prefix (CP); and estimating and detecting channel performance based on the generated DM-RS signal pattern. The DM-RS pattern supports from rank 1 to rank 8 patterns for 8 layer transmission. A transmitter, a receiver and a system thereof are also provided. The solution of the present invention improves channel estimation accuracy, saves channel estimation implementation and implementation complexity at terminals. | 07-14-2011 |
20110194571 | ADAPTIVE FORWARD POWER CONTROL AND ADAPTIVE REVERSE POWER CONTROL FOR SPREAD-SPECTRUM COMMUNICATIONS - A code-division-multiple-access (CDMA) system employing spread-spectrum modulation. The CDMA system has a base station (BS), and a plurality of subscriber units. The signals transmitted between the base station and subscriber unit use spread-spectrum modulation. The improvement apparatus for adaptive forward power control (APC) from a base station (BS) to a subscriber unit (SU), includes sending from the base station, using spread-spectrum modulation, a BS-spreading code on a forward channel. The subscriber unit despreads the BS-spreading code on the forward channel as a despread signal, determines a first power level P.sub.d which includes power of the despread signal plus noise and a second power level P.sub.N, which includes despread-noise power. The subscriber unit determines a first error signal e.sub.1, from the first power level P.sub.d, the second power level P.sub.N, and a required signal-to-noise ratio SNR.sub.REQ for service type, and a second error signal e.sub.2, from a measure of total received power P.sub.r and an automatic gain control (AGC) set point P.sub.o. The subscriber unit forms a combined error signal from the first error signal e.sub.1, the second error signal e.sub.2, a first weight a.sub.1 and a second weight a.sub.2, and hard limits the combined error signal to form a single APC bit. The APC bit is transmitted to the base station. In response to the APC bit, the base station adjusts transmitter power to the subscriber unit. | 08-11-2011 |
20110216786 | OFDM SYSTEM AND METHOD EMPLOYING OFDM SYMBOLS WITH KNOWN OR INFORMATION-CONTAINING PREFIXES - Systems and methods for transmitting and receiving OFDM symbols are provided which enable the otherwise wasted transmission time normally used as a prefix for each OFDM symbol to contain useful information. At the receiver, the received signal is processed to convert received OFDM symbols from a linear convolution with the channel to a cyclic convolution. | 09-08-2011 |
20110268137 | COMMUNICATION WITHIN AN INTEGRATED CIRCUIT INCLUDING AN ARRAY OF INTERCONNECTED PROGRAMMABLE LOGIC ELEMENTS - An integrated circuit includes an array of interconnected programmable logic elements ( | 11-03-2011 |
20110274123 | SYSTEM AND METHOD FOR ALLOCATING TRANSMISSION RESOURCES - A method for wirelessly transmitting user data and at least a first type of control information using a plurality of transmission layers including encoding bits of a first type of control information to form one or more control codewords and encoding bits of user data to form one or more user data codewords. The method also includes generating a plurality of vector symbols based on the control codewords and the user data codewords. Each vector symbol includes a plurality of modulation symbols that are each associated with a transmission layer over which the associated modulation symbol will be transmitted. Generating the plurality of vector symbols includes interleaving bits of the one or more control codewords and bits of the one or more user data codewords so that the first type of control information is carried in modulation symbols associated with the same transmission layers in all the vector symbols transmitted during the subframe that carry the first type of control information. The method also includes transmitting the plurality of vector symbols to a receiver over a plurality of transmission layers. | 11-10-2011 |
20110286473 | Signal processing under attenuated transmission conditions - Signal processing under attenuated transmission conditions. Within an orthogonal signal space, the number of orthogonal signals that are used to transmit information from a transmitter to a receiver is reduced and the transmitted power of each of the now remaining orthogonal signals is modified; this may involve increasing the power of all of the remaining orthogonal signals equally or alternatively modifying them individually. The same modulation used before the reduction may also be used afterwards; within communication systems having multiple transmitter-receiver paths, this will ensure that the communication system's throughput and efficiency will remain unchanged even when one (or more) transmitter-receiver paths are highly attenuated. In addition, robust mode operation is provided for ranging and registering of transmitter devices when entering the communication system. In addition, the unused orthogonal signals may be employed to support interference cancellation of those orthogonal signals that are used to transmit information. | 11-24-2011 |
20120140780 | Coherent Power Combining via Wavefront Multiplexing on Deep Space Spacecraft - A communication system and method for a deep space spacecraft receiver to perform post-processing to dynamically combine received signal power coherently for pre-processed signal streams radiated non-coherently from a distributed, multiple element, Ka-band transmitting array via multiple concurrent propagation paths. Mutually orthogonal data and pilot signals travel though the multiple propagation paths. A pre-processor utilizing wavefront multiplexing restructures signal streams on the ground into multi-channel wavefrom structures along with injections of pilot signals for diagnostic and probing purposes. These restructured, or “wavefront multiplexed” (WFM) signals are transmitted through propagation channels to a receiver on the spacecraft, wherein adaptive equalization and wavefront de-multiplexing coherently separates the mixtures of received WFM signals. Transmitting power can be dynamically allocated for the multiple concurrent data streams, radiated to different spacecraft within the same field of view according to continuously changing demand by changing the relative input power ratios of the WFM signal mixtures. | 06-07-2012 |
20120257640 | Uniquely Decodable Codes And Decoder for Overloaded Synchronous CDMA Systems - A recursive method for constructing uniquely decodable codes for overloaded synchronous CDMA systems, where large signature codes with growing overloading factors are reconstructed from the small ones. A class of uniquely decodable signature matrices (or encoders) for overloaded synchronous CDMA are also devised. A decoder for synchronous CDMA systems to extract the user data by a number of comparisons with respect to some predefined thresholds. | 10-11-2012 |
20120269202 | TECHNIQUE FOR SWITCHING BETWEEN 1X AND 2X OVERSAMPLING RATE IN A TD-SCDMA RECEIVER - A TD-SCDMA receiver is provided that includes a joint detection (JD) block receiving a first input signal from a channel estimation block for signal detection. A short channel detection (SCD) block receives the first input signal and detecting the presence/absence of an AGWN-like channel based on the first input signal from the channel estimation block. The SCD block switches the JD block between 1× and 2× oversampling rates by sending to the JD block a second input signal. | 10-25-2012 |
20120275472 | CHANNEL IMPULSE RESPONSE (CIR)/DC OFFSET (DCO) JOINT ESTIMATION BLOCK AND METHOD - A channel impulse response (CIR)/DC offset (DCO) joint estimation for a time division synchronous code division multiple access (TDSCDMA) system includes generating from a basic midamble and received midamble an initial estimation of the CIR as a series of CIR taps; storing the initially estimated CIR taps; calculating a DC compensated CIR from the initially estimated CIR taps; filtering out the noise from the DC compensated CIR to produce the CIR estimation; and calculating the DC offset estimation from the CIR estimation. | 11-01-2012 |
20130010810 | Ingress Suppression for Communication Systems - A method used in the receiver of a communication system is provided to suppress narrow band interferences, known as ingress, that are present in the communication channel, which is shared by a plurality of transmitters each having a channel pre-equalizer, by means of a Time Division Multiple Access (TDMA) scheme or Synchronous Code Division Multiple Access (SCDMA) scheme. The method comprises filtering the interferences using Infinite Impulse Response (IIR) notch filters, and providing IIR all-pass filters devised to compensate for substantially all phase distortions introduced by the notch filters. The method also includes an algorithm to detect the narrow band interferences and an adaptive equalizer to equalize the channel by computing the coefficients of the transmitters' pre-equalizers, and arranged such that the equalization of the channel is isolated from the suppression of the interferences. | 01-10-2013 |
20130028271 | COFDM digital television receivers for iterative-diversity reception - Receivers with capability for iterative-diversity reception of COFDM digital television transmissions of repeated similarly coded data are described. Also described are receivers with capabilities for receiving COFDM digital television transmissions in which earlier transmissions of coded data are later followed by subsequent transmissions of the same data differently coded. The receivers use maximal-ratio code combining techniques for repeated components in the COFDM digital television transmissions. The receivers use turbo decoding techniques for concatenated coding of data in the COFDM digital television transmissions. | 01-31-2013 |
20130064252 | SIGNAL TRANSMISSION/RECEPTION CIRCUIT - The code word generation section generates a code word by adding an error checking and correcting code to an word. The conversion section divides the code words into bit strings each including information bits having the same number of bits as that of the word and code bits having the same number of bits as that of the error checking and correction code, and for each of the bit strings, outputs the information bits of the bit string to a first signal line group and outputs the code bits to a second signal line group. When dividing the code words into the bit strings, the code words are divided in such a manner as to satisfy a condition that a plurality of bits of the same code word are not output at the same time on a particular signal line group. | 03-14-2013 |
20130195122 | METHOD FOR MULTIPLEXING UPLINK CONTROL INFORMATION ON A PHYSICAL UPLINK SHARED CHANNEL - A method of selecting resource element for UCI transmission and countering a ping-pong effect includes adjusting transmission parameters without adjusting a channel quality indicator/pre-coding matrix index. The transmission parameters include a modulation coding set of a transport block and a transport block size. Another method of selecting resource element for UCI transmission and countering the ping-pong effect includes selecting a transport block having a highest modulation coding set index or the transport block having a lowest modulation coding set index. Alternatively, the evolved Node B may select the transport block having a largest size or the transport block having the smallest size. | 08-01-2013 |
20130287046 | SEAMLESS CHANGE OF DEPTH OF A GENERAL CONVOLUTIONAL INTERLEAVER DURING TRANSMISSION WITHOUT LOSS OF DATA - Methods and communication systems are presented, in which an interleaver depth is adjusted. | 10-31-2013 |
20130322469 | MULTI-CHANNEL CODE-DIVISION MULTIPLEXING IN FRONT-END INTEGRATED CIRCUITS - A code-division multiplexing (CDM) system utilized in multi-channel (MC) front-end integrated circuits to significantly reduce the power consumption of such systems. The CDM system extends data compression advantages to uncorrelated and weakly correlated MC signals through the introduction of a new Multi-Channel Signal Binning and Multiplexing (MCSBM) method and architecture. The method achieves significant reductions in power consumption in comparison to a conventional time-division multiplexing quantizer, while adding only a modest amount of overhead and complexity. Systems and methods permit architects to fabricate MC integrated circuits with ultra low power consumption and small chip area. Another embodiment relates to the system's compressor organizing samples of the input signal in such a way that the downstream analog-to-digital converter quantizes the higher variance samples with a higher resolution compared to the resolution it uses to quantize other samples with lower variance. | 12-05-2013 |
20140140360 | Systems and Methods for Sparse Code Multiple Access - Coding gains can be achieved by encoding binary data directly to multi-dimensional codewords, which circumvents QAM symbol mapping employed by conventional CDMA encoding techniques. Further, multiple access can be achieved by assigning different codebooks to different multiplexed layers. Moreover, sparse codewords can be used to reduce baseband processing complexity on the receiver-side of the network, as sparse codewords can be detected within multiplexed codewords in accordance with message passing algorithms (MPAs). | 05-22-2014 |
20140153587 | APPARATUS AND METHOD FOR ENCODING CONSTANT AMPLITUDE IN CODE DIVISION MULTIPLEXING COMMUNICATION SYSTEM - A method and apparatus for encoding a constant amplitude that is applied to a code division multiplexing communication system are provided. By dividing a data bit into a block unit, the receiving side can easily determine an error, and by reducing power consumption in outdoor wide area communication using a bit string of a small length in a basic unit of an input frame, efficiency can be improved, and thus a physical layer of a ubiquitous sensor network can be optimized. | 06-05-2014 |
20140341235 | MULTIPLE ACCESS COMMUNICATION SYSTEM AND PHOTOVOLTAIC POWER GENERATION SYSTEM - Each transmitter ( | 11-20-2014 |
20150092792 | Method and system for implementing synchronous parallel transmission over multiple channels - Disclosed are a method and a system for implementing synchronous parallel transmission over multiple channels. The method comprises: a sending end and a receiving end accessing an NoC through a sending port and a receiving port on the NoC, the sending port and the receiving port having a capability of simultaneously and parallely transmitting data; the sending end sending data to the sending port of the NoC, and the sending port encoding the received data into a bipolar data symbol and modulating the bipolar data symbol by using a Walsh code; then the NoC synchronously adding and combining modulated symbols of all sending ports, and sending a signal after the combination to each receiving port through an NoC bus synchronously and parallely; and the receiving port demodulating the received combined data according to the Walsh code thereof to obtain the bipolar data symbol, and then decoding the bipolar data symbol and sending the decoded bipolar data symbol to the receiving end. The present invention implements the synchronous parallel transmission over multiple channels, and one or more channels can be dynamically allocated to each NoC port so as to adapt to different communication bandwidth requirements. | 04-02-2015 |
20160119073 | System and Method for Low Peak to Average Power Ratio Multiple Access Communications - A method for generating a virtual codebook of low peak to average power ratio (PAPR) sequences includes generating a plurality of low PAPR combination block sequences, with each low PAPR combination block sequence including at least one of a plurality of sparse codebook, and applying time domain hopping to the plurality of low PAPR combination block sequences, thereby producing a virtual codebook. The method also includes storing the virtual codebook. | 04-28-2016 |
20160134416 | DATA TRANSMISSION/RECEPTION SYSTEM, TRANSMISSION APPARATUS AND RECEPTION APPARATUS - There is provided a data transmission/reception system for performing a data communication using interleaving, comprising: a transmission apparatus configured to transmit data in which a synchronization signal including identification data is included; and a reception apparatus configured to extract the synchronization signal from the data received from the transmission apparatus, wherein upon detecting that the extracted synchronization signal is not coincident with any one of a plurality of predetermined code strings, the reception apparatus replaces the extracted synchronization signal with one predetermined code string among the plurality of predetermined code strings, wherein an inter-code word distance between the one predetermined code string and the extracted synchronization signal is the smallest among the calculated inter-code word distances; and the reception apparatus identifies a storage unit for storing the data received from the transmission apparatus based on the identification data included in the replaced synchronization signal. | 05-12-2016 |