Method for a maximum likelihood decoding of a convolutional code with decision weighting, and corresponding decoder
Patent 5406570 Issued on April 11, 1995. Estimated Expiration Date: 
April 16, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
April 16, 2012. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent ReferencesPath trace viterbi decoder Process for the decoding of a convolutional code and corresponding decoder Maximum likelihood decoder Method and apparatus for implementing a traceback maximum-likelihood decoder in a hypercube network System and method for calculating channel gain and noise variance of a communication channel Patent #: 5214675 InventorsAssigneeApplicationNo. 870483 filed on 04/16/1992US Classes:714/792, Trellis code375/341, Maximum likelihood decoder or viterbi decoder714/787, Random and burst errors714/794, Maximum likelihood714/795Viterbi decodingExaminersPrimary: Beausoliel, Robert W. Jr.Assistant: Decady, Albert Attorney, Agent or FirmInternational ClassH01S 003/18Foreign Application Priority Data1991-04-23 FRAbstractA method for the decoding of digital data obtained according to a convolutional coding and transmitted on a noise-ridden channel aimed at improving the methods of maximum likelihood decoding such as the Viterbi algorithm consisting in associating, with each estimation s(t) of the corresponding source digital element a(t), a weighting coefficient m(t) representing the reliability of the estimation s(t), the estimation s(t) taking account of the values of a first series of L received samples, and the weighting m(t) taking account of the values of a second series of N samples received, N being strictly greater than L. In a preferred embodiment, a second trellis is associated with the standard first decoding trellis, a trace-back being done in the second trellis on two concurrent paths, used to revise the weighting coefficients obtained at output of the first trellis.Other References
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