Blind per-state detection of DPSK over correlated fading channels

Authors:
Alan Barbieri
Affiliations:
Scuola Superiore Sant'Anna, Pisa, Italy
Venue:
ISIT'09 Proceedings of the 2009 IEEE international conference on Symposium on Information Theory - Volume 2
Year:
2009

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Abstract

We consider a differentially encoded phase-shift keying (DPSK) signal transmitted over a channel affected by correlated Rayleigh fading. For this problem, we derive the exact maximum a posteriori (MAP) symbol detection algorithm. Byanalyzing its properties, we demonstrate that it can be implemented by a forward-backward estimator of the channel, followed by a symbol-by-symbol completion to produce the a posteriori probabilities of the information symbois. The resulting algorithm can be employed as a soft-input soft-output (SISO) block in turbo-iterative receivers and exhibits an excellent performance despite its limited computational complexity. The performance of the proposed algorithm is evaluated for time-domain modulations over frequency-flat channels and for frequency-domain modulations over time-invariant channels.