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Soft-decoding combined trellis-coded quantization/modulation

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2 Author(s)
Keang-Po Ho ; Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Shatin, China ; Kwok Hung Chei

The well-known Bahl-Cocke-Jelinek-Raviv (BCJR) symbol-by-symbol MAP algorithm (1974) is modified as a soft-decoder for combined TCQ/TCM. The optimal TCQ encoder is derived for the soft-decoding BCJR algorithm. The TCQ encoder and the soft-decoder are optimized iteratively for minimum distortion. Significant performance improvement is achieved for both memoryless Gaussian and uniform source, especially for very noisy channel.

Published in:

Global Telecommunications Conference, 1999. GLOBECOM '99  (Volume:5 )

Date of Conference:

1999