Improving differential detection of MDPSK by nonlinear noise prediction and sequence estimation

TitleImproving differential detection of MDPSK by nonlinear noise prediction and sequence estimation
Publication TypeJournal Article
Year of Publication1999
AuthorsSchober, R., W. H. Gerstacker, and J. B. Huber
JournalCommunications, IEEE Transactions on
Pagination1161 -1172
Date Publishedaug.
Keywordsadditive white Gaussian noise, AWGN channel, AWGN channels, decision feedback equalisers, decision-feedback equalization, delayed decision-feedback sequence estimation, delays, differential detection, differential phase shift keying, filtering theory, finite impulse response, FIR filters, flat fading, IIR filters, IIR prediction-error filter, infinite impulse response, M-ary differential phase-shift keying, MDPSK, noise, noncoherent low-complexity receivers, nonlinear filters, nonlinear noise prediction, nonlinear time-variant FIR filter, optimum coefficients, prediction theory, Rayleigh fading, received signal representation, receivers, Rician fading, sequence estimation, sequential estimation, simulations, transmitted symbol sequence

A new technique is proposed to improve the performance of differential detection (DD) of M-ary differential phase-shift keying (MDPSK) significantly, applying sequence estimation. In order to obtain an appropriate representation of the received signal, a nonlinear time-variant finite impulse response or infinite impulse response prediction-error filter is used. For both filter structures the optimum coefficients are derived, assuming transmission over an additive white Gaussian noise (AWGN) channel. Delayed decision-feedback sequence estimation (DDFSE) is employed to estimate the transmitted symbol sequence. It is shown by simulations that even for decision-feedback equalization, which is a simple special case of DDFSE, a significant performance improvement of conventional DD under AWGN conditions results. In contrast to other noncoherent low-complexity receivers proposed in literature, this receiver is very robust under flat fading (Rayleigh and Ricean) conditions


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