Pragmatic Performance of TC8PSK in Rician Fading Channels

Tomohiro DOHI  Tsutomu SAKAI  Masahiro MORIKURA  Shuzo KATO  

IEICE TRANSACTIONS on Communications   Vol.E74-B   No.8   pp.2230-2236
Publication Date: 1991/08/25
Online ISSN: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Modulation and Coding for Mobile Satellite Communication System)

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This paper analyzes performances of trellis coded(TC) 8PSK modulation in Rician fading channels to optimize parameters of Viterbi decoders. The computer simulation clarifies that when carrier power to multipath power ratio (C/M) equals 10dB, Pe performance with reasonable length interleaving depends on free Euclidean distance (dfree) but not on effective code length(ECL) in a practical range of bit error probability (Pe= 10-3-10-4). In the case of C/M=5dB, the effect of ECL appears in the range of bit energy to noise power density ratio (Eb/No)C/M (=5dB). Therefore, for domestic mobile satellite communication systems for non-high latitude countries, only dfree must be considered for TC8PSK Viterbi decoder design. Moreover, to improve Pe performance in slow fading environment, pre-Viterbi-decoding maximal ratio combining is proposed. The proposed diversity scheme improves required Eb/No to achieve Pe=10-4 by more than 6dB compared with no interleaving and more than 2.5 dB compared with interleaving.