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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 Maximum Likelihood Decoder Or Viterbi DecoderMaximum Likelihood Decoder Or Viterbi Decoder patent applications listed are from June 2005 to current and include Date, Patent Application Number, Patent Title, Patent Abstract summary and are linked to the corresponding patent application page.11/15/07 - 20070263742 - 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, wherein the maximum-likelihood estimation is realized through a pre-filtering dependent upon the transmission characteristic, a subsequent ... 11/08/07 - 20070258534 - 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 maximum likelihood estimation from a received signal, ... 10/11/07 - 20070237251 - Cooperative inter-carrier channel coding apparatus, systems, and methods Embodiments of a codation module associated with a global system for mobile communications (GSM) enhanced data rates for GSM evolution (EDGE) radio access network (GERAN) transceiver are described generally herein. Other embodiments may be described and claimed. ... 10/04/07 - 20070230606 - Viterbi traceback In accordance with some embodiments, a traceback unit with traceback and path memories is provided. ... 09/20/07 - 20070217536 - Method and apparatus for calculating likelihood metric of a received signal in a digital communication system A likelihood metric calculation method including: estimating a channel of a received signal and generating a channel estimate; compensating a channel of the received signal according to the channel estimate; calculating a region variable according to the channel estimate; and comparing the region variable and a magnitude of the compensated ... 08/23/07 - 20070195904 - Wireless communications device including a joint demodulation filter for co-channel interference reduction and related methods A wireless communications device may include a housing and a wireless transmitter and a wireless receiver carried by the housing. The wireless receiver may include a joint demodulation filter for reducing co-channel interference between a desired signal and a co-channel interfering signal which may include an input receiving samples of ... 08/09/07 - 20070183525 - Digital broadcasting transmission and reception system A digital broadcasting transmission and reception system includes a digital broadcasting transmission apparatus and a digital broadcasting reception apparatus. The digital broadcasting transmission apparatus that includes a robust processor that codes a robust stream of a dual transport stream where a normal stream and the robust stream are combined. The ... 08/02/07 - 20070177687 - Path memory circuit When a storage circuit (13) of a certain stage and those of the following stages are caused to stop, a storage element circuit (11) of a memory area B (2) that stores survivor paths of a particular state is caused to serve as a repeater, and the other storage element ... 05/24/07 - 20070116143 - Reduced complexity detection and decoding for a receiver in a communication system Techniques for performing detection and decoding at a receiver are described. In one scheme, the receiver obtains R received symbol streams for M data streams transmitted by a transmitter, performs receiver spatial processing on the received symbols to obtain detected symbols, performs log-likelihood ratio (LLR) computation independently for each of ... 03/22/07 - 20070064827 - Decoding techniques for multi-antenna systems The invention relates to a wireless radiofrequency data communication system comprising: a base-station comprising a multiple of N first groups and a signal processing-unit comprising memory means and processing means, wherein each first group comprises a receiver-unit provided with a receiver and at least one antenna which is connected to ... 01/11/07 - 20070009057 - Wireless communication system, receiving apparatus with a plurality of antennas, demodulating method for such wireless communication system, receiving apparatus, and program for such demodulating method A receiving apparatus has two or more reception antennas, a data reproducer, and a likelihood information generator. The receiving apparatus operates selectively in a first reception mode and a second reception mode depending on the features of signals sent from a transmitting apparatus. In the first reception mode, the receiving ... 11/09/06 - 20060251181 - Method and system for signal detection using a reduced transmitter constellation The present invention relates to a method, typically deployed on receivers deployed, for detecting a transmitted signal from a transmitter constellation by quantizing an altered signal to obtain a reduced constellation from the transmitter constellation (205), and then performing a maximum-likelihood detection scheme on the reduced constellation to obtain the ... 09/07/06 - 20060198458 - Methods and apparatus for self-inverting turbo code interleaving with high separation and dispersion The present invention provides methods for generating self-inverting turbo code interleavers having high separation and high dispersion characteristics. Methods are provided for deterministically generating self-inverting turbo code interleavers from a specification for an existing non-self-inverting interleaver. Methods are also provided for randomly generating self-inverting turbo code interleavers. The present invention ... 09/07/06 - 20060198457 - Methods and apparatus for self-inverting turbo code interleaving with high separation and dispersion The present invention provides methods for generating self-inverting turbo code interleavers having high separation and high dispersion characteristics. Methods are provided for deterministically generating self-inverting turbo code interleavers from a specification for an existing non-self-inverting interleaver. Methods are also provided for randomly generating self-inverting turbo code interleavers. The present invention ... 09/07/06 - 20060198456 - Methods and apparatus for self-inverting turbo code interleaving with high separation and dispersion The present invention provides methods for generating self-inverting turbo code interleavers having high separation and high dispersion characteristics. Methods are provided for deterministically generating self-inverting turbo code interleavers from a specification for an existing non-self-inverting interleaver. Methods are also provided for randomly generating self-inverting turbo code interleavers. The present invention ... 07/27/06 - 20060165190 - 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 station allocates the bits from the codeword to each symbol, modulates the symbols ... 07/13/06 - 20060153311 - Method and system for dynamic interleaver adaptation scheme in vdsl The present invention provides a method and apparatus for a new interleaver adaptation scheme that achieves “error free” and zero delay (interleaving—triangular) or near zero delay variation (interleaving—GCI), and with easier implementation but no additional memory required. The dummy insertion methods and systems embodiments of the invention provide an effective ... 06/01/06 - 20060115013 - Blind modulation classification apparatus for use in satellite communication system and method thereof A blind modulation classification apparatus in a satellite communication system improves performance in non-ideal communication environment having frequency error and phase error, by reducing computational burden of test statistic and possibility of numerical error of hardware, with computation of likelihood for each stage independently. The blind modulation classification apparatus includes ... 04/27/06 - 20060088118 - 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 circuit for generating a plurality of first output values according to ... 02/23/06 - 20060039492 - Hybrid memory architecture for reduced state sequence estimation (rsse) techniques A method and apparatus are disclosed for improving the processing time of reduced complexity sequence estimation techniques, such as reduced state sequence estimation (RSSE). The possible values for the branch metrics in the RSSE are precomputed to permit pipelining and the shortening of the critical path. The computational load of ... 11/24/05 - 20050259762 - Decoding techniques for multi-antenna systems The invention relates to a wireless radiofrequency data communication system comprising: a base-station comprising a multiple of N first groups and a signal processing-unit comprising memory means and processing means, wherein each first group comprises a receiver-unit provided with a receiver and at least one antenna which is connected to ... 11/10/05 - 20050249299 - Methods and apparatus for detecting local maximums in a two-dimensional data set Methods and apparatus for detecting local maximums in a two-dimensional data set. Apparatus is provided for detecting a local maximum in a two-dimensional data set, where a stream of data elements represents the data set. The apparatus includes first detection logic that receives the data stream and operates to detect ... ### FreshPatents.com Support |