Patent ID: 6192503
Filing Date: 2001-02-20
Classification: H03M,H04L

Abstract:
An apparatus for decoding a communications signal which represents a source sequence encoded according to respective first and second error correction codes which produce respective first and second encoded sequences which are multiplexed to produce the communications signal, the apparatus comprising:communications signal processing means for processing the communications signal to produce first and second received sequences of symbols corresponding to the first and second encoded sequences, respectively; andselective recursive decoding means, responsive to said communications signal processing means, for selectively recursively decoding the first and second received sequences according to the respective first and second codes augmented by previous estimates of a symbol of the source sequence to repeatedly produce revised estimates of the symbol until a revised estimate satisfying a predetermined reliability criterion is obtained, wherein said selective recursive decoding means nonrecursively decodes at least one of the first and second received sequences according to the respective error correction codes to produce estimates of a first group of symbols in the source sequence and wherein said selective recursive decoding means recursively decodes the first and second received sequences to produce estimates of a second group of symbols of the source sequence.