Decision-feedback differential detection of MDPSK for flat Rayleigh fading channels

TitleDecision-feedback differential detection of MDPSK for flat Rayleigh fading channels
Publication TypeJournal Article
Year of Publication1999
AuthorsSchober, R., W. H. Gerstacker, and J. B. Huber
JournalCommunications, IEEE Transactions on
Pagination1025 -1035
Date Publishedjul.
Keywordsadditive white Gaussian noise channel, AWGN channel, AWGN channels, bandlimited fading processes, BER, bit-error rate, circuit feedback, computational load, decision-feedback differential detection, differential detection, differential phase shift keying, error floor reduction, error statistics, exact expression, filtering theory, flat Rayleigh fading channels, genie-aided DF-DD, infinite order feedback filters, M-ary differential phase-shift keying, MDPSK signals, multiple-symbol detection, power spectrum, QDPSK, Rayleigh channels, simulation results

In this paper, decision-feedback differential detection (DF-DD) of M-ary differential phase-shift keying (MDPSK) signals, which has been introduced previously for the additive white Gaussian noise (AWGN) channel by Leib et al. (1988) and Edbauer (1992), is extended to flat Rayleigh fading channels. The corresponding DF-DD metric is derived from the multiple-symbol detection (MSD) metric and for genie-aided DF-DD, an exact expression for the bit-error rate (BER) of QDPSK (M=4) is calculated. Furthermore, the dependence of BER on the power spectrum of the fading process is investigated for feedback filters of infinite order. It is shown that in this case, for ideally bandlimited fading processes, the error floor of conventional differential detection (DD) can be removed entirely. Simulation results confirm that both MSD and DF-DD with feedback filters of finite order can reduce the error floor of conventional DD significantly. DF-DD thereby causes considerably less computational load


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