低信噪比下独特码检测
THE DETECTION OF UNIQUE WORD AT LOWER SNR
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摘要: 该文分析了时分多址(TDMA)通信系统中独特码(UW)的检测和在低信噪比下独特码检测器的设计。提出了一种基于最大似然准则的通用的独特码检测器的工程实现方案。仿真结果表明它的性能比传统的硬判决-门限检测方法在码长为16和低信噪比条件下获得大约3-4dB的改善。该文所研究的独特码检测器已经应用于新近开发的通信系统中。Abstract: This paper describes the principles of Unique Word(UW) detection and the design methods for a UW-detector at lower SNR. An engineering solution for a general purpose UW-detector based on maximum likelihood criteria is proposed. The simulation results show a 3-4dB improvement over the often employed hard-decision/threshold detection when the length of UW is 16 and the SNR is low. The developed UW-detectors have been used in auther s recent communication systems.
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INTELSAT, INTELSAT TDMA/DSI System Performance Specification, IESS-D317, 1997,TDMA/DDI Traffic Terminals.[2]J.L. Massey, Optimum frame synchronization, IEEE Trans. on Comm., 1972, 20(2), 115-119.[3]S. Sriram.[J].Maximum likelihood frame synchronizer for TDMA system, Proc. of IEEEGLOBECOMM98 Mini Conferences, Sydney, Australia.1998,:-[4]W.H. Sheen, C. T. Shih, On the performance evaluation, selection, and design of unique-wordsfor TDMA system, IEEE Trans. on Vehicular Technology, 1995, 44(1), 111-I20.[5]J.G. Proakis, Digital Communications, Third Edition, New York, McGraw-Hill, 1995, Chapter5. -
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