Title :
Soft-decoding combined trellis-coded quantization/modulation
Author :
Ho, Keang-Po ; Chei, Kwok Hung
Author_Institution :
Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Shatin, China
Abstract :
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.
Keywords :
Gaussian channels; Viterbi decoding; combined source-channel coding; iterative decoding; memoryless systems; quantisation (signal); trellis coded modulation; BCJR algorithm; Bahl-Cocke-Jelinek-Raviv algorithm; TCQ encoder; combined TCQ/TCM; combined source channel coding; combined trellis-coded quantization/modulation; memoryless Gaussian source; minimum distortion; noisy channel; soft-decoding; symbol-by-symbol MAP algorithm; trellis-coded modulation; trellis-coded quantization; uniform source; Algorithm design and analysis; Design optimization; Iterative algorithms; Iterative decoding; Partitioning algorithms; Quantization; Signal to noise ratio; Simulated annealing; Turbo codes; Viterbi algorithm;
Conference_Titel :
Global Telecommunications Conference, 1999. GLOBECOM '99
Print_ISBN :
0-7803-5796-5
DOI :
10.1109/GLOCOM.1999.831742
