A New Burst Coherent Demodulator for Microcellular TDMA/TDD Systems

Yoichi MATSUMOTO
Shuji KUBOTA
Shuzo KATO

Publication
IEICE TRANSACTIONS on Communications   Vol.E77-B    No.7    pp.927-933
Publication Date: 1994/07/25
Online ISSN: 
DOI: 
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Issue on Personal, Indoor and Mobile Radio Communications)
Category: 
Keyword: 
demodulator,  carrier-recovely,  clock-recovery,  coherent-detection,  TDMA/TDD,  

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Summary: 
This paper proposes a new burst coherent demodulator that improves transmission quality of microcellular TDMA/TDD systems for personal communications and has configuration suitable for low power consumption with LSIC-implementation. To achieve the better transmission quality, the proposed demodulator employs coherent detection with a unique carrier recovery scheme that can operate without any preamble for carrier recovery. In addition, the demodulator uses a clock recovery scheme with clock phase estimation using twice differentiation, which eliminates hangup and attains fast clock acquisition at 2 samples/symbol. Experimental results clarify the superiority of the proposed coherent demodulator for microcellular TDMA/TDD systems. The proposed coherent demodulator reduces the irreducible frame error rate by 40%, and achieves 4dB improvement at the frame error rate of 10% compared with differential detection under the Rayleigh fading (fD/fs=810-5, τrms/Ts=510-2) typical of personal communication environments.