Joint Source-Channel Decoding by Channel-Coded Optimal Estimation

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.