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Class Information
Number: 375/262
Name: Pulse or digital communications > Systems using alternating or pulsating current > Plural channels for transmission of a single pulse train > Quadrature amplitude modulation > Maximum likelihood decoder or viterbi decoder
Description: Subject matter for choosing an estimate code word for each possible received sequence of a demodulation output.

Patents under this class:
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Patent Number Title Of Patent Date Issued
7161995 Method and apparatus for Viterbi synchronization Jan. 9, 2007
7149266 Signal receiver and method of compensating frequency offset Dec. 12, 2006
7145968 Viterbi decoder of partial response maximum likelihood channel Dec. 5, 2006
7143335 Add-compare-select arithmetic unit for Viterbi decoder Nov. 28, 2006
7142611 M-Ary phase shift keying (PSK) bit-boundary turbo coded system Nov. 28, 2006
7142610 M-Ary quadrature amplitude modulation (QAM) bit-boundary turbo coded system Nov. 28, 2006
7139336 Method and system for channel estimation using iterative estimation and detection Nov. 21, 2006
7139312 System and method for improving coding gain performance within gigabit phy viterbi decoder Nov. 21, 2006
7136413 Method and apparatus for generation of reliability information with diversity Nov. 14, 2006
7131055 Fast bit-parallel Viterbi decoder add-compare-select circuit Oct. 31, 2006
7127666 Device and method to carry out a viterbi-algorithm Oct. 24, 2006
7127664 Reconfigurable architecture for decoding telecommunications signals Oct. 24, 2006
7120851 Recursive decoder for switching between normalized and non-normalized probability estimates Oct. 10, 2006
7116710 Serial concatenation of interleaved convolutional codes forming turbo-like codes Oct. 3, 2006
7107212 Bitstream data reduction coding by applying prediction Sep. 12, 2006
7107514 Method and apparatus for detecting Viterbi decoder errors due to quasi-catastophic sequences Sep. 12, 2006
7103090 Timing estimation of direct sequence spread spectrum communications systems over frequency-selective, slowly fading channels Sep. 5, 2006
7103107 Demodulator, receiver, and communication system Sep. 5, 2006
7099411 Soft-output decoding method and apparatus for controlled intersymbol interference channels Aug. 29, 2006
7099413 Method for near optimal joint channel estimation and data detection for COFDM systems Aug. 29, 2006
7095812 Reduced complexity receiver for space-time- bit-interleaved coded modulation Aug. 22, 2006
7096411 Method and apparatus for reliable resynchronization of sequential decoders Aug. 22, 2006
7096412 Method for iterative and non-iterative data detection using reduced-state soft-input/soft-output algorithms for complexity reduction Aug. 22, 2006
7092470 Data transfer method, block synchronizing signal detecting method, and reproducing apparatus Aug. 15, 2006
7088784 Coded modulation for partially coherent systems Aug. 8, 2006
7088792 Device and method for efficient decoding with time reversed data Aug. 8, 2006
7085985 Close two constituent trellis of a turbo encoder within the interleave block Aug. 1, 2006
7085992 Method and device for decoding a sequence of physical signals, reliability detection unit and viterbi decoding unit Aug. 1, 2006
7082168 Methods and apparatus for self-inverting turbo code interleaving with high separation and dispersion Jul. 25, 2006
7080311 Convolutional coding and decoding method and system Jul. 18, 2006
7080313 Signal evaluation apparatus and signal evaluation method Jul. 18, 2006
7076000 Soft-decision metric generation for higher order modulation Jul. 11, 2006
7076005 System and method for transmission format detection Jul. 11, 2006
7076720 Encoding apparatus and decoding apparatus Jul. 11, 2006
7065146 Method and apparatus for equalization and decoding in a wireless communications system including plural receiver antennae Jun. 20, 2006
7065147 System and method of data communication using turbo trellis coded modulation combined with constellation shaping with or without precoding Jun. 20, 2006
7065695 Metric calculation design for variable code rate decoding of broadband trellis, TCM, or TTCM Jun. 20, 2006
7065699 Using quadrant shifting to facilitate binary arithmetic with two's complement operands Jun. 20, 2006
7062000 Viterbi decoder Jun. 13, 2006
7062701 Method for storing path metrics in a viterbi decoder Jun. 13, 2006
7058086 Method and apparatus for concatenated convolutional encoding and interleaving Jun. 6, 2006
7058135 Data element reordering function Jun. 6, 2006
7058878 Data processing apparatus using iterative decoding Jun. 6, 2006
7054392 Process and device for estimating the successive values of digital symbols, in particular for the equalization of an information transmission channel in mobile telephony May. 30, 2006
7050514 Interference estimation and scaling for efficient metric storage and interference immunity May. 23, 2006
7051268 Method and apparatus for reducing power consumption of a decoder in a communication system May. 23, 2006
7042954 Apparatus and method for calculating soft decision value input to channel decoder in a data communication system May. 9, 2006
7039855 Decision function generator for a Viterbi decoder May. 2, 2006
7035327 Adaptive equalizer for use in information reproducing apparatus Apr. 25, 2006
7035342 Parallel concatenated code with soft-in soft-out interactive turbo decoder Apr. 25, 2006

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