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A Soft-Detector Based on Multiple Symbol Differential Detection for Unitary Space-Time Modulation |
Li Ying; Wang Xin; Zhang Xiao-ying; Wei Ji-bo |
School of Electronic Science and Engineering, National University of Defense Technology, Changsha 410073, China |
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Abstract A soft-detector with low complexity is proposed for Differential Unitary Space-Time Modulation (DUSTM). Based on the multiple symbol differential detection, the detector provides log-likelihood ratios of coded bits for the successive soft-decision decoding. Simulation results show that by using the proposed algorithm in a coded DUSTM system, the signal power efficiency is improved by 2~4dB compared with the counterpart of hard-decision decoding within an acceptable range of bit error rate, and the error floor caused by a single symbol differential soft-detector is eliminated in fast fading.
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Received: 17 July 2006
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