Mutual information performance of differential MPSK detection over time-varying channels

Krusevac, Zarko B., Rapajic, Predrag and Kennedy, Rodney A. (2008) Mutual information performance of differential MPSK detection over time-varying channels. In: Proceedings - 2008 IEEE International Symposium on Information Theory, ISIT 2008. Institute of Electrical and Electronics Engineers, Inc., Piscataway, NJ, USA, pp. 2752-2756. ISBN 9781424422562

Abstract

This paper provides mutual information performance analysis of multiple-symbol differential WSK (M-phase shift keying) over time-correlated, time-varying flat-fading communication channels. A state space approach is used to model time correlation of time varying channel phase. This approach captures the dynamics of time correlated, time-varying channels and enables exploitation of the forward-backward algorithm for mutual information performance analysis. It is shown that the differential decoding implicitly uses a sequence of innovations of the channel process time correlation and this sequence is essentially uncorrelated. It enables utilization of multiple-symbol differential detection, as a form of block-by-block maximum likelihood sequence detection for capacity achieving mutual information performance. It is shown that multiple-symbol differential ML detection of BPSK and QPSK practically achieves the channel information capacity with observation times only on the order of a few symbol intervals

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