不完全CSI下协作空间调制系统中继选择及分析  

Relay Selection and Analysis of Cooperative Spatial Modulation System with Incomplete CSI

作　　者：李彤[1,2] 仇润鹤[1,2] LI Tong;QIU Runhe(Donghua University,Shanghai 201620,China;Engineering Research Center of Digitized Textile&Apparel Technology,Ministry of Education,Shanghai 201620,China)

机构地区：[1]东华大学,上海201620 [2]数字化纺织服装技术教育部工程研究中心,上海201620

出　　处：《通信技术》2021年第2期374-383,共10页Communications Technology

基　　金：国家自然科学基金面上项目(No.61671143)。

摘　　要：提出了一种基于位置信息的中继选择方案,并将该方案应用于不完全信道状态信息下的协作空间调制系统中。在该系统中,对源节点使用空间调制技术,应用所提出的方案每时隙在全部中继中选择最接近源节点和目的节点间中点的一个中继进行放大转发,目的节点采用了最大似然检测技术对接收信号进行检测。利用检测结果,运用矩生成函数法对系统成对错误概率和理论平均误比特率的上界进行分析,并在此基础上得出了高信噪比下的渐近表达式。使用MATLAB对以上分析进行了蒙特卡洛仿真,分析了信道估计误差的方差为固定值和随着信噪比增大而减小的可变值时对系统误比特率的影响,验证了所提方案的有效性。A relay selection scheme based on location information is proposed and applied to a cooperative spatial modulation system with incomplete CSI(Channel State Information).In this system,the spatial modulation technology is used on the source node,and a relay that is closest to the mid-point between the source node and the destination node is selected for amplification and forwarding in each time slot of the proposed scheme.The destination node adopts the maximum likelihood detection technology to detect the received signals.Based on the detection results,the upper bound of the pairwise probability and the theoretical average bit error rate of the system is analyzed by the method of moment generation function,and on this basis,the asymptotic expression under high SNR is obtained.By using MATLAB,Monte Carlo simulation is done on the above analysis,the influence of the variance of channel estimation error on the system bit error rate is analyzed when the variance is a fixed value and the variable value decreases with the increase of SNR,and the effectiveness of the proposed scheme is verified。

关 键 词：空间调制 放大转发 不完全信道状态信息 中继选择 误比特率 

分 类 号：TN911[电子电信—通信与信息系统]