Multiple Symbol Differential Detection with Majority Decision Method for DQPSK in LOS Channel

Hiroyasu ISHIKAWA  Hideyuki SHINONAGA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E96-B   No.1   pp.384-388
Publication Date: 2013/01/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.E96.B.384
Print ISSN: 0916-8516
Type of Manuscript: LETTER
Category: Satellite Communications
Keyword: 
multiple symbol differential detection,  majority decision method,  frequency offset compensation technique,  

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Summary: 
This letter proposes a multiple symbol differential detection (MSDD) with majority decision method for differentially coded quadrature phase-shift keying (DQPSK) in Rician fading channels. The proposed method shows better BER performance than the conventional MSDD. Simulation results show that the proposed MSDD with a majority decision method improves the system's BER performance for DQPSK signals under the AWGN channel and it approaches asymptotically the theoretical BER performance of coherent detection. Furthermore, the proposed method shows better BER performance under the Rician fading channel with large frequency offsets especially for the range of C/M > 12 dB in comparison with the conventional MSDD.