On the Detection of Multiple-Access Spatial Modulations  

作　　者：ZHOU Enzhi HAO Li 

机构地区：[1]Key Lab of Information Coding and Transmission, Southwest Jiaotong University, Chengdu 610031, China

出　　处：《Chinese Journal of Electronics》2017年第1期172-178,共7页电子学报（英文版）

基　　金：supported by the National Basic Research Program of China(973 Program)(No.2012CB316100);the National Natural Science Foundation of China(NSFC)(No.61271245)

摘　　要：The detection problem for the Multipleaccess Spatial modulations(M-SM) is investigated in this paper, where multiple transmitters adopting spatial modulation communicate to the receiver at the same time.The optimal Maximum-likelihood(ML) detection suffers from the high computational complexity, while Sphere decoding(SD) can not reduce the complexity effectively because of the multiple active antennas in M-SM. In order to avoid the high complexity, a Space-alternating generalized expectation-maximization(SAGE) algorithm aided List-pro jection(S-LP) detector is proposed and applied to M-SM systems. The received signal vector is firstly projected onto the subspaces spanned by the columns of channel matrices corresponding to the possible active antennas. Then some combinations of antenna indices with the largest pro jections are selected as candidate index sets,based on which, a modified SAGE algorithm is applied to update the candidate symbols. Both analysis and simulation results show that the proposed S-LP detector achieves a near-optimum performance with a significantly reduced complexity compared with ML and SD detection.The detection problem for the Multipleaccess Spatial modulations（M-SM） is investigated in this paper, where multiple transmitters adopting spatial modulation communicate to the receiver at the same time.The optimal Maximum-likelihood（ML） detection suffers from the high computational complexity, while Sphere decoding（SD） can not reduce the complexity effectively because of the multiple active antennas in M-SM. In order to avoid the high complexity, a Space-alternating generalized expectation-maximization（SAGE） algorithm aided List-pro jection（S-LP） detector is proposed and applied to M-SM systems. The received signal vector is firstly projected onto the subspaces spanned by the columns of channel matrices corresponding to the possible active antennas. Then some combinations of antenna indices with the largest pro jections are selected as candidate index sets,based on which, a modified SAGE algorithm is applied to update the candidate symbols. Both analysis and simulation results show that the proposed S-LP detector achieves a near-optimum performance with a significantly reduced complexity compared with ML and SD detection.

关 键 词：Multiple-input multiple-output（MIMO） Spatial modulation（SM） Multi-user detection 

分 类 号：TN911.3[电子电信—通信与信息系统]