Signal decoding methods and apparatus

Pulse or digital communications – Systems using alternating or pulsating current – Plural channels for transmission of a single pulse train

Reexamination Certificate

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Reexamination Certificate

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07424063

ABSTRACT:
A method of decoding a transmitted string of symbols received as a received signal. The method includes searching for a candidate string of symbols, by searching for candidate symbols within a region of a multi-dimensional lattice, and decoding the transmitted string of symbols by selecting a candidate string of symbols. The candidate string of symbols includes a string of candidate symbols. The searching for the candidate symbols includes selecting a candidate value for one of the transmitted symbols, and testing whether a part of the multi-dimensional lattice defined by the selected candidate value is within a bounding distance from the received signal. The searching for the candidate symbols is stopped after a limiting number of performances of the testing. The decoding includes providing a linear estimate of the transmitted string of symbols when the searching for the candidate string of symbols fails to locate the candidate string of symbols.

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Babak Hassibi, et al., “On the Expected Complexity of Sphere Decoding”, Institute of Electrical and Electronics Engineers, vol. 1 of 2, conf. 35, XP-010582204, Nov. 4, 2001, pp. 1051-1055.
Mohamed Oussama Damen, et al., “On Maximum-Likelihood Detection and the Search for the Closest Lattice Point”, IEEE Transactions on Information Theory, vol. 49, No. 10, XP-002313805, Oct. 1, 2003, pp. 2389-2402.

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