Optimum Post-Detection Diversity of Binary DPSK System in Fast Rician Fading Channel

Shinsuke HARA  Norihiko MORINAGA  

IEICE TRANSACTIONS (1976-1990)   Vol.E73    No.2    pp.220-228
Publication Date: 1990/02/25
Online ISSN: 
Print ISSN: 0000-0000
Type of Manuscript: PAPER
Category: Radio Communication

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This paper describes the post-detection diversity improvement of a binary DPSK system in the fast Rician fading environment encountered in mobile satellite communication system. Firstly, the error probability is presented by a closed form which contains no special functions, then the optimum weighting factors in diversity branches to minimize the bit error rate (BER) are investigated. To minimize the BER, the maximum likelihood ratio detection principle is used for the detector outputs with exponential-type probability density function. Some unknown channel parameters contained in the optimum weighting factors are estimated by the channel estimators in diversity branches. Finally, the theoretical BER performances of three kinds of mobile satellite communication systems (satellite/aircraft, satellite/land mobile and satellite/ship) are presented.