Communication system model for information rate evaluation of differential detection over time-varying channels

Z. B. Krusevac, P. B. Rapajic, R. A. Kennedy

    Research output: Contribution to journalArticlepeer-review

    Abstract

    A communication system model for mutual information performance analysis of multiple-symbol differential M-phase shift keying over time-correlated, time-varying flat-fading communication channels is developed. This model is a finite-state Markov (FSM) equivalent channel representing the cascade of the differential encoder, FSM channel model and differential decoder. A state-space approach is used to model channel phase time correlations. The equivalent model falls in a class that facilitates the use of the forward-backward algorithm, enabling the important information theoretic results to be evaluated. Using such a model, one is able to calculate mutual information for differential detection over time-varying fading channels with an essentially finite time set of correlations, including the Clarke fading channel. Using the equivalent channel, it is proved and corroborated by simulations that multiple-symbol differential detection preserves the channel information capacity when the observation interval approaches infinity.

    Original languageEnglish
    Pages (from-to)1301-1310
    Number of pages10
    JournalIET Communications
    Volume2
    Issue number10
    DOIs
    Publication statusPublished - 2008

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