Decision-feedback differential detection based on linear prediction for MDPSK signals transmitted over Ricean fading channels

TitleDecision-feedback differential detection based on linear prediction for MDPSK signals transmitted over Ricean fading channels
Publication TypeJournal Article
Year of Publication2000
AuthorsSchober, R., and W. H. Gerstacker
JournalSelected Areas in Communications, IEEE Journal on
Pagination391 -402
Date Publishedmar.
KeywordsBER performance, bit error rate, computer simulations, decision-feedback differential detection, differential detection, differential phase shift keying, Doppler shift, error statistics, feedback, frequency offset, frequency-nonselective channels, genie-aided prediction-based DF-DD, irreducible error floor, land mobile radio, least squares approximations, linear prediction, M-ary differential phase-shift keying, MDPSK signals, mobile communications, multiple-symbol detection, prediction theory, predictor coefficients, QDPSK, quadrature phase shift keying, recursive least squares algorithm, Ricean fading channels, Rician channels

In this paper, linear prediction-based decision-feedback differential detection (DF-DD) for M-ary differential phase-shift keying (MDPSK) signals transmitted over Ricean fading channels is proposed. This scheme can improve conventional DD significantly for a multitude of frequency-nonselective channels, as shown analytically and by computer simulations. Prediction-based DF-DD is particularly well suited for application in mobile communications since the predictor coefficients may be updated regularly using the recursive least squares (RLS) algorithm. Here, adaptation can start blind, i.e., no training sequence and no a prior knowledge about the channel statistics are required. A further important characteristic of the proposed detection scheme is that no degradation occurs under frequency offset. The bit error rate (BER) performance of QDPSK with genie-aided prediction-based DF-DD is analyzed, and it is shown under which conditions the irreducible error floor of conventional DD can be removed entirely. In addition, the influence of Doppler shift is discussed. Last, the proposed scheme is compared with a second DF-DD scheme, which is based on multiple-symbol detection


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