Soft-decision receiver and decoder for digital communication

Details Soft-decision receiver and decoder for digital communication Soft-decision receiver and decoder for digital communication

H - Electricity

04

L

H04L 1/22 (2006.01) H03M 13/00 (2006.01) H04B 1/16 (2006.01)

Patent

CA 2180311

A receiver for soft decision and decoding for deriving an appropriate soft- decision value so as to reduce the error rate at the output of a decoder such as a Viterbi decoder. A length V of continuous transmission sequences possible to be generated is set greater than a memory length L of a channel (V>L). By providing branch metric producing circuits as many as 2N (N=2 V) and add/compare/select apparatus (ACS apparatus) of as many as N for respective states corresponding to combinations of transmission sequence data of V, the accuracy of a soft-decision value is enhanced. Further, a soft- decision value producing circuit performs a process not based on path metrics but based on survivor metrics. This allows a digital signal processor to easily perform the process.

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