Abstract:

A multiple-trellis-coded-modulation (MTCM) symbol sequence design method for Rician channels as well as its corresponding decoding algorithm, state-symbol sequence decoding, are proposed. The complexity of maximum likelihood detection algorithm, such as general Viterbi algorithm for MTCM, is very high. Based on the design characters of MTCM, an applicable decoding algorithm is presented: first, the state sequence of MTCM is determined, and then the symbol sequence between two successive determined states is decoded. With this algorithm, it is not necessary for the decoding output to wait for until the whole symbol sequence is received, that will lead to an acceptable short decoding delay. For MTCM symbol sequences suffering from wireless fading, the decoding performance can approximate that of the maximum likelihood decoding algorithm by changing one parameter. Theoretic analysis and simulation can prove the proposed.

Key words: Rician channel, multiple-trellis-coded-modulation, state-symbol sequence decoding