MLSE differential phase detection for M-ary DPSK

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An improved differential phase detection (DPD) scheme based on maximum likelihood sequence estimation (MLSE) is presented for M-ary DPSK modulation. The transmitted phase sequence is estimated from the detected received signal phases only. From the approximate a posteriori joint probability distribution of the output phase noises of L differential phase detectors with orders from 1 to L symbols, the author derives the suboptimal decision algorithm called ML-DPD. To achieve better performance than ML-DPD while also reducing computation complexity, he derives Viterbi-decoding DPD (Viterbi-DPD) which uses, as the branch metric, the sum of squared phase errors of L differential phase detectors with orders from 1 to L symbols. The performance improvements possible with these two new detection schemes are evaluated by computer simulations for 2- and 4 DPSK transmission in AWGN channels.

Original languageEnglish
Pages (from-to)407-412
Number of pages6
JournalIEE Proceedings: Communications
Issue number6
Publication statusPublished - 1994 Dec


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