酉空时调制系统中基于多符号差分检测的软检测器
doi: 10.3724/SP.J.1146.2006.01054
A Soft-Detector Based on Multiple Symbol Differential Detection for Unitary Space-Time Modulation
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摘要: 该文设计了一种适用于差分酉空时调制体制的低复杂度软检测算法。该算法基于多符号差分检测，为软判决译码模块提供编码比特的对数似然比信息。仿真表明，在通常容许的误码范围内，采用所提出的软检测算法构建的差分酉空时调制系统比原硬判决系统节省2～4dB的信号功率，并解除了基于单符号差分检测的软检测算法在快衰落信道下的错误平层。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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