Title :
Design of optimal soft decoding for combined trellis coded quantization/modulation in Rayleigh fading channel
Author :
Chei, Kwok-Hung ; Ho, Keang-Po
Author_Institution :
Dept. of Inf. Eng., Chinese Univ. of Hong Kong, Shatin, China
Abstract :
The well-known Bahl-Cocke-Jelinek-Raviv (BCJR) algorithm is used as a minimum mean-squared error (MMSE) decoder for combined trellis-coded quantization and modulation. When the BCJR algorithm is used as decoder, the optimal trellis-coded encoder is derived. Both trellis-coded quantizer and the soft-decoder can be optimized iteratively for minimum overall distortion from transmitter input to receiver output. The optimal encoder/decoder is simulated for Rayleigh fading channel. Significant performance improvement is achieved for both memoryless Gaussian and uniform source, especially for very noisy channel
Keywords :
Rayleigh channels; Viterbi decoding; combined source-channel coding; least mean squares methods; quantisation (signal); trellis coded modulation; BCJR algorithm; Bahl-Cocke-Jelinek-Raviv algorithm; MMSE decoder; Rayleigh fading channel; TCQ/TCM; combined trellis coded quantization/modulation; memoryless Gaussian source; minimum mean-squared error; minimum overall distortion; noisy channel; optimal encoder/decoder; optimal soft decoding; optimal trellis-coded encoder; uniform source; Algorithm design and analysis; Euclidean distance; Fading; Gaussian noise; Iterative algorithms; Iterative decoding; Modulation coding; Quantization; Simulated annealing; Viterbi algorithm;
Conference_Titel :
Acoustics, Speech, and Signal Processing, 2000. ICASSP '00. Proceedings. 2000 IEEE International Conference on
Conference_Location :
Istanbul
Print_ISBN :
0-7803-6293-4
DOI :
10.1109/ICASSP.2000.861011
