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| Number | Title | Issue Date |
| 8175180 | Pre-encoding and pre-decoding apparatuses and methods thereof A pre-encoding apparatus and a pre-decoding apparatus are provided. The pre-encoding apparatus adopts a cascade structure constituted by a plurality of pre-encoding units and a plurality of interleavers for pre-encoding, and the pre-decoding apparatus adopts a casca... | 05/08/2012 |
| 8144794 | Efficient optimal ML detector An efficient optimal maximum-likelihood output detector reducing the complexity of demodulation/decoding computations in multiple-input multiple-output communication systems. A plurality of received signals may be combined into a plurality of combined received signa... | 03/27/2012 |
| 8130853 | Method and apparatus for performing baseband equalization in symbol modulated communications A method and apparatus for processing a frequency domain digital Orthogonal Frequency Division Multiplexing (OFDM) symbol. The method includes generating an estimate of a channel for each sub-carrier of the frequency domain digital OFDM symbol; generating a pluralit... | 03/06/2012 |
| 8126074 | Method and apparatus for equalization and decoding in a wireless communications system including plural receiver antennae A method and apparatus for processing a frequency domain digital Orthogonal Frequency Division Multiplexing (OFDM) symbol. The method includes generating an estimate of a channel for each sub-carrier of the frequency domain digital OFDM symbol; generating channel st... | 02/28/2012 |
| 8121208 | Multi-input multi-output system for enhancing transmission performance The present invention relates to a multi-input multi-output (MIMO) system for enhancing transmission performance. The MIMO system uses space-time encoding and transmit antenna selection methods, and includes a transmitter (100) and a receiver (200). Th... | 02/21/2012 |
| 8111767 | Adaptive sliding block Viterbi decoder An adaptive sliding block Viterbi decoder (ASBVD) includes forward and backward Viterbi processors, a state estimator and a control unit. The processors generate metrics of states and of transitions between the states associated with an encoder, based on encoded inp... | 02/07/2012 |
| 8077788 | Soft demapping for MIMO decoding A look-up table having distance information corresponding to a distance between a potential candidate symbol and a most proximate competing symbol for each bit of a plurality of potential candidate symbols is provided for a given modulation type. A MIMO decoder will... | 12/13/2011 |
| 8073067 | Method and apparatus for transferring signals in a wireless communication system Data is transferred in a wireless communication system, such as a wireless spread spectrum communication system. A plurality of transmitting antennas are provided. Data is encoded to produce a plurality of data streams for each of the plurality of codes. The plurali... | 12/06/2011 |
| 8059739 | Method and apparatus for correcting data transmission errors A wireless communication device corrects data transmission errors caused by the simultaneous transmission of multiple streams of data in a Multiple-Input Multiple-Output (MIMO) network. The wireless communication device corrects data transmission errors by removing ... | 11/15/2011 |
| 8045636 | Maximum-likelihood frame synchronization algorithms for OFDM systems Autocorrelation algorithms are employed in systems and methods to detect preamble symbols for frame synchronization in WiMAX (Worldwide Interoperability for Microwave Access) or OFDMA (Orthogonal Frequency Division Multiple Access) systems. An ML (“Maximum Likelih... | 10/25/2011 |
| 8031791 | QLM decoding A method for implementation of error correction decoding of quadrature layered modulation QLM communications. A bound on communications capacity derived using ideal QLM is approximated with QLM communications links which support data rates independent of the Shannon... | 10/04/2011 |
| 8023581 | Max-log receiver for multiple-input multiple-output (MIMO) systems A method includes the steps of i) listing out all possibilities for a first symbol of a two stream signal; ii) determining a second symbol of the two stream signal for each of the first symbol listed out, iii) evaluating a metric for each of the first symbol and sec... | 09/20/2011 |
| 8000403 | Coding device, decoding device, transmitter and receiver A coding device including a coding unit generating a systematic bit, a first redundant bit corresponding to the systematic bit, and a second redundant bit corresponding to the systematic bit, has a generating unit generating, from the two pieces of systematic bits, ... | 08/16/2011 |
| 7974358 | Orthogonal frequency division multiplexing (OFDM) encoding and decoding methods and systems An orthogonal frequency division multiplexing (OFDM) system provided for communication includes an OFDM transmitter and an OFDM receiver. The OFDM transmitter may be configured to transmit OFDM signals through a communication channel and may include a channel encode... | 07/05/2011 |
| 7970071 | Method and device for synchronizing the carrier frequency of an offset quadrature phase-modulated signal A method and a device for synchronizing the carrier frequency of a carrier signal comprising a frequency offset and/or a phase offset. According to the invention, the method estimates the frequency offset and/or phase offset of the carrier signal by means of a maxim... | 06/28/2011 |
| 7965782 | Reduced complexity maximum likelihood decoder for MIMO communications A reduced complexity maximum likelihood decoder receives a stream of symbols Y and channel estimate H. A transformation converts Y and H into Z and R by computing matrix R, such that the product of R and Q produces matrix H. A second transformation column-swaps matr... | 06/21/2011 |
| 7961806 | Power adaptive channel estimation for a multi-path receiving A multi-path receiving system is provided. The multi-path receiving system includes a multi-path analyzer, a channel estimator and an equalizer. The multi-path analyzer analyzes a channel impulse response (CIR) of the multi-path channel from the received stream. The... | 06/14/2011 |
| 7940852 | Near optimal joint channel estimation and data detection for COFDM systems A method for decoding a received signal comprising the steps of receiving a signal at a plurality of antennas, applying Fast Fourier transformations to the received signal, estimating channel characteristics of a channel over which the signal was transmitted using i... | 05/10/2011 |
| 7924933 | Enhanced successive interference cancellation (SIC) receiver for multiple-input multiple-output (MIMO) systems A method includes the steps of: i) listing out all possibilities for first symbol of a two stream signal; ii) determining a second symbol of the two stream signal for each said first symbol listed out, iii) evaluating a metric for each said first symbol and second s... | 04/12/2011 |
| 7912140 | Reducing computational complexity in maximum likelihood MIMO OFDM decoder A method and a system for reducing computational complexity in a maximum-likelihood MIMO decoder, while maintaining its high performance. A factorization operation is applied on the channel Matrix H. The decomposition creates two matrixes: an upper triangular with o... | 03/22/2011 |
| 7903752 | Maximum likelihood decoder for pulse and amplitude position modulation multi-source system The present invention concerns a sphere decoder for maximum likelihood receiver intended to receive M-PPM-M′-PAM symbols at M modulation positions and at M′ amplitude levels from a plurality P of sources. The sphere decoder uses a Schnorr-Euchner type enumeratio... | 03/08/2011 |
| 7881394 | Method and apparatus for computing soft decision input metrics to a turbo decoder A method and apparatus for computing soft decision input metrics to a turbo decoder includes circuits associated with eight-ary phase shift keyed (8PSK) modulation and sixteen-ary quadrature amplitude modulation (16QAM). In both implementations log-likelihood ratio ... | 02/01/2011 |
| 7876847 | Global minimum-based MLD demapping for soft-output MIMO detection A method for generating soft bit values for a multi-bit symbol encoded in one or more received signals comprises (a) for a plurality of different combinations of multiple bit values, iteratively generating, for each combination, a metric value based on the one or mo... | 01/25/2011 |
| 7869534 | Method and apparatus for clock-pulse synchronization with an offset QPSK-modulated transmission signal An approach is provided for clock-pulse synchronization between an amplitude-modulated or phase-modulated received signal and a transmitted signal by estimating the timing offset between the received signal and the transmitted signal by maximum-likelihood estimation... | 01/11/2011 |
| 7852960 | Method of computing path metrics in a high-speed Viterbi detector and related apparatus thereof A path metric computing method applied in a high-speed Viterbi detector and related apparatus thereof are disclosed. The path metric computing apparatus includes a comparator for generating a control signal according a plurality of previous path metrics, a combining... | 12/14/2010 |
| 7848440 | Multi-channel communication method and apparatus using plural Markov Chain Monte Carlo simulations A technique for estimating channel data probability in a multi-user or multiple-input multiple-output communication system is disclosed. The technique uses parallel Markov Chain Monte Carlo simulation to select a plurality of hypothetical channel data patterns. Chan... | 12/07/2010 |
| 7835458 | Method of decoding a spatially multiplexed signal and its corresponding receiver An embodiment of a method for decoding a received signal function of at least a channel matrix B, and of a first and second symbols S1, and S2 belonging to a signal constellation. The method comprises the steps of: selecting a set of values of the first symbol S1 in... | 11/16/2010 |
| 7822137 | System and method for symbol rate estimation using vector velocity A system and method for symbol rate estimation using vector velocity that does not require any prior knowledge of the signal's structure and is accurate in the presence of frequency offset and noise. An input signal is converted to a symbol constellation path signal... | 10/26/2010 |
| 7817740 | Method and system for minimum mean squared error soft interference cancellation (MMSE-SIC) based suboptimal maximum likelihood (ML) detection for multiple input multiple output (MIMO) wireless system Various aspects of a method for minimum mean square error soft interference cancellation (MMSE-SIC) based sub-optimal maximum likelihood (ML) detection for a multiple input multiple output (MIMO) wireless system may comprise selecting at least one constellation poin... | 10/19/2010 |
| 7813438 | Detector and method for estimating data probability in a multi-channel receiver A detector and method for estimating channel data probability in a multi-user or multiple-input multiple-output communication system includes summing conditional bit probabilities conditioned on hypothetical channel data patterns over stochastically selected hypothe... | 10/12/2010 |
| 7796701 | Digital decoder for a digital wireless transmission system using a space-time linear code A digital decoder for a transmitting and receiving-multi-antenna digital wireless transmission chain for determining symbols transmitted in linear space-time coded transmission signals based on a convolutional binary coding, the digital decoder being fed by: —a re... | 09/14/2010 |
| 7792205 | Encoding and decoding of frame control header in downlink subframes in wireless communication systems Techniques and devices for encoding and decoding a signal channel in a downlink signal in wireless communication systems, including the frame control header (FCH) data in IEEE 802.16 systems with reduced transmission power consumption, improved error correction capa... | 09/07/2010 |
| 7751491 | Code design method for repeat-zigzag Hadamard codes A method for selecting a signal to noise ratio for a communications code includes obtaining extrinsic information transfer (EXIT) information for a repeat-zigzag Hadamard (RZH) code responsive to a Hadamard order and a signal to noise ratio, determining code paramet... | 07/06/2010 |
| 7724834 | System and method for maximum likelihood decoding in multiple out wireless communication systems A system and method for a simplified Maximum Likelihood (ML) decoding (203) for MIMO systems is provided. The full ML decoding gives the lower bound of the decoding for CC coded MIMO systems. However, the computation cost is too high to be implemented in real... | 05/25/2010 |
| 7720166 | System, method and device of decoding spatially multiplexed signals Embodiments of the present invention provide a method, apparatus and system of decoding spatially multiplexed signals. In some demonstrative embodiments the method may include, for example, determining one or more hypothetical values of a transmitted signal of a set... | 05/18/2010 |
| 7702026 | Efficient optimal ML detector An efficient optimal maximum-likelihood output detector reducing the complexity of demodulation/decoding computations in multiple-input multiple-output communication systems. A plurality of received signals may be combined into a plurality of combined received signa... | 04/20/2010 |
| 7688908 | System and method for processing wireless high definition video data using a shortened last codeword A method and system for processing high definition video data to be transmitted over a wireless medium is disclosed. In one embodiment, the method includes receiving an information packet having the length of L bytes, wherein L=(M×n×K)+A, and where: M is the depth... | 03/30/2010 |
| 7656960 | Adaptive modulation method and coding rate control method In a radio communication system, transmitter and receiver stations share information on a maximum number of bits communicated per symbol. The transmitter station encodes a signal with sufficient error correcting capabilities to create a codeword. The transmitter sta... | 02/02/2010 |
| 7656959 | Pipelined decision-feedback unit in a reduced-state viterbi detector with local feedback A pipelined decision feedback unit (DFU) is disclosed for use in reduced-state Viterbi detectors with local feedback. The disclosed pipelined decision feedback unit improves the maximum data rate that may be achieved by the reduced state Viterbi detector by the pipe... | 02/02/2010 |
| 7646821 | Method and apparatus for equalization and decoding in a wireless communications system including plural receiver antennae A baseband processor includes a demodulator that demodulates a symbol received by a maximum ratio combining (MRC) receiver via receive pathways. A viterbi decoder generates branch metrics for decoding the symbol. The branch metrics are generated based on a channel s... | 01/12/2010 |
