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An iterative source-channel decoding scheme which exploits the source residual redundancies on symbol-basis is proposed. We first derive a modified BCJR algorithm based on the sectionalized code trellis for symbol decoding of the convolutional codes. This is used in conjunction with a softbit source decoder that computes the interpolative a posteriori probabilities of quantizer indexes. Simulation...
In this work, we attempt to capitalize more fully on the source residual redundancy and then develop an MD-ISCD scheme which permits to exchange between its two constituent decoders the whole symbol extrinsic information. The first step toward realization is to derive the modified BCJR algorithm based on sectionalized code trellises that provides reliability information on each transmitted symbol...
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