Spatial Modulation and Space-Time Shift Keying: Optimal Performance at a Reduced Detection Complexity
Spatial Modulation and Space-Time Shift Keying: Optimal Performance at a Reduced Detection Complexity
复制标题
DOI：
10.1109/tcomm.2012.100312.120251
复制
发表时间：
2013-01-01
影响因子：
8.3
通讯作者：
Hanzo, Lajos
中科院分区：
文献类型：
--
作者：
Xu, Chao;Sugiura, Shinya;Hanzo, Lajos
在本文中，我们提出了一个全面的降低复杂度的检测器，无论是硬决策辅助以及软决策辅助空间调制（SM）/空时移键控（STSK）。更明确地，可以通过分别检测天线激活索引m和LPSK/QAM符号s（l）来执行激活M个天线中的单个天线以发送单个LPSK/QAM符号的SM方案的检测，使得检测复杂度可以从O（M）的量级降低。L）到O（M + log（2）L）的下界。然而，在[1]中提出的QAM辅助STSK硬检测导致性能损失。此外，[2]中提出的用于软STSK检测的Max-Log-MAP算法仅考虑了最大后验概率，这也造成了性能下降。因此，在本文中，我们提出了一种新的解决方案，硬判决辅助SM/STSK检测，保持其最佳性能，尽管其降低了检测复杂度，无论是LPSK或LQAM时。此外，我们提出了降低复杂度的近似对数MAP算法设想的软判决辅助SM/STSK检测器，以取代次优的Max-Log-MAP算法。
In this paper, we propose a comprehensive reduced-complexity detector both for hard-decision-aided as well as for the soft-decision-assisted Spatial Modulation (SM)/Space-Time Shift Keying (STSK). More explicitly, the detection of the SM scheme, which activates a single one out of M antennas to transmit a single LPSK/QAM symbol, may be carried out by detecting the antenna activation index m and the LPSK/QAM symbol s(l) separately, so that the detection complexity may be reduced from the order of O(M . L) to the lower bound of O(M + log(2) L). However, the QAM aided STSK hard detection proposed in [1] results in a performance loss. Furthermore, the Max-Log-MAP algorithm proposed for soft STSK detection in [2] only takes into account the maximum a posteriori probabilities, which also imposed a performance degradation. Therefore, in this paper, we propose a novel solution for hard-decision-aided SM/STSK detection, which retains its optimal performance, despite its reduced detection complexity, when either LPSK or LQAM is employed. Furthermore, we propose the reduced-complexity Approx-Log-MAP algorithm conceived for the soft-decision-aided SM/STSK detector, in order to replace the suboptimal Max-Log-MAP algorithm.