A Low-Complexity Near-ML Differential Spatial Modulation Detector
A Low-Complexity Near-ML Differential Spatial Modulation Detector
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DOI：
10.1109/lsp.2015.2425042
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发表时间：
2015-04
影响因子：
3.9
通讯作者：
Miaowen Wen;Xiang Cheng;Yuyang Bian;H. Poor
中科院分区：
文献类型：
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作者：
Miaowen Wen;Xiang Cheng;Yuyang Bian;H. Poor
差分空间调制(DSM)是为空间调制技术量身定做的一种新的差分方案，它在任意时刻只选择一组天线中的一根进行传输。然而，当发射天线数量很大时，DSM会带来令人望而却步的搜索复杂性。本文提出了一种适用于DSM的低复杂度次优检测器。它是基于最大似然准则设计的，但考虑了更多的天线激活顺序候选。检测分两步进行：第一步是通过利用信号星座的对称性将调制符号的候选数目限制在一小部分内；第二步是通过维特比类算法根据确定的天线激活顺序从第一步的输出中选择最有可能的调制符号。分析和仿真表明，该检测器在获得接近最优性能的同时，大大降低了搜索复杂度。
Differential spatial modulation (DSM) is a newly-emerging differential scheme tailored to the spatial modulation technique, which selects only one among a group of antennas for transmission at any time instant. DSM, however, gives rise to prohibitive search complexity when the number of transmit antennas is large. In this letter, a low-complexity suboptimal detector is proposed for DSM. It is designed based on the maximum-likelihood criterion but takes more candidates for the antenna activation orders into account. The detection is performed in two steps: the first step is to confine the number of candidates for the modulated symbols to a small portion by exploiting the symmetry of the signal constellation; the second step is to select the most likely modulated symbols from the output of the first step according to the determined antenna activation order via a Viterbi-like algorithm. Analyses and simulations show that the proposed detector achieves near-optimal performance yet largely reduces the search complexity.