著者

MINOWA Tadashi OGIWARA Haruo

出版者

一般社団法人電子情報通信学会

雑誌

IEICE transactions on fundamentals of electronics, communications and computer sciences (ISSN:09168508)

巻号頁・発行日

vol.81, no.10, pp.2047-2054, 1998-10-25

被引用文献数

25

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Soft-in/soft-out Viterbi algorithm (SOVA) originally proposed for rate 1/n code is applied to rate m/(m+1) trellis-coded modulation (TCM). In TCM, 2^m branches merge into a node in a code trellis. After pruning the branches on path with less path-metric until two best paths remain, SOVA is applied to the pruned trellis. Based on the pruned trellis, an iterative decoding algorithm of turbo TCM is developed. Effects of path memory length and scaling of a value transferred between decoding stages are investigated through simulation. Turbo TCM over 8 PSK and 16 QAM channel with Gaussian noise realize a bit error rate (BER) of 10^<-5> within 1dB from the Shannon limit.