Joint Source-Channel Decoding by Channel-Coded Optimal Estimation

Norbert Gortz Institute for Circuits and Systems Theory Christian-Albrechts-University of Kiel e-mail: ng@techfak.uni-kiel.de WWW: http://www-lns.techfak.uni-kiel.de/staff/ng Abstra t | Channel-Coded Optimal Estimation (CCOE) is an algorithm which combines sourcestatistics, bit-reliability informations at the channel output and the redundancy introduced by some channel code to compute the a-posteriori probabilities of the possibly transmitted source-encoder indices at the receiver. A recursive formula for the computation of the a-posteriori probabilities is derived and some special cases are given. The algorithm is generalized for the parallel transmission of several quantizer indices which commonly encode each source-signal vector. Simulation results are presented and the performances of several algorithms for source-channel decoding are compared.

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