Adaptive noncoherent DFE for MDPSK signals transmitted over ISI channels

TitleAdaptive noncoherent DFE for MDPSK signals transmitted over ISI channels
Publication TypeJournal Article
Year of Publication2000
AuthorsSchober, R., and W. H. Gerstacker
JournalCommunications, IEEE Transactions on
Volume48
Pagination1128 -1140
Date Publishedjul.
ISSN0090-6778
Keywordsadaptive equalisers, adaptive filters, adaptive NDFE, adaptive noncoherent DFE, AWGN, circuit feedback, coherent MMSE DFE, computational complexity, decision feedback equalisers, differential phase shift keying, feedback filters, feedforward, feedforward filters, filtering theory, frequency offset, intersymbol interference, intersymbol interference channels, ISI channels, least mean squares methods, M-ary differential phase shift-keying, MDPSK signals, minimum mean-squared error, modified least mean-square algorithm, modified recursive least squares algorithm, noncoherent decision-feedback equalization, noncoherent linear equalizer, suboptimum DFE, telecommunication channels
Abstract

A novel noncoherent decision-feedback equalization (NDFE) scheme for M-ary differential phase shift-keying signals transmitted over intersymbol interference channels is presented. A suboptimum version with lower computational complexity and a noncoherent linear equalizer (NLE) are derived from the original NDFE scheme. Furthermore, the relation of the novel NLE to a previously proposed NLE is investigated. In contrast to known NDFE schemes, the novel scheme can approach the performance of coherent minimum mean-squared error decision-feedback equalization. For adaptation of the feedforward and feedback filters, efficient novel modified least mean-square and recursive least squares algorithms are presented. Finally, it is shown that the proposed adaptive NDFE scheme is robust against frequency offset

URLhttp://dx.doi.org/10.1109/26.855520
DOI10.1109/26.855520

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