基于干扰辅助MMSE检测的去蜂窝大规模MIMO中D2D通信干扰协调算法  

Interference coordination algorithm for D2D communication in cell-free massive MIMO based on interference-assisted MMSE detection

作　　者：陈玉萍 赵峰[1] 李春海[2] 周慧怡 CHEN Yuping;ZHAO Feng;LI Chunhai;ZHOU Huiyi(School of Information and Communication,Guilin University of Electronic Technology,Guilin 541004,China;Guangxi Engineering Research Center of Industrial Internet Security and Blockchain,Guilin University of Electronic Technology,Guilin 541004,China)

机构地区：[1]桂林电子科技大学信息与通信学院,广西桂林541004 [2]桂林电子科技大学广西工业互联网安全与区块链工程研究中心,广西桂林541004

出　　处：《桂林电子科技大学学报》2024年第2期127-135,共9页Journal of Guilin University of Electronic Technology

基　　金：国家自然科学基金(61871466)。

摘　　要：针对D2D通信复用去蜂窝大规模MIMO网络资源所带来的干扰问题,研究了与D2D通信共存的去蜂窝大规模多输入多输出系统的联合导频分配和功率优化问题。首先,为了抑制D2D用户(DUEs)对去蜂窝用户(CFUEs)的干扰,提出了一种干扰辅助最小均方误差(MMSE)检测器,并推导了DUE和基于干扰辅助MMSE检测的CFUEs在不完美信道状态条件下的上行链路闭合频谱效率表达式。其次,为了减少导频污染,针对导频分配问题,提出了以最小化系统归一化信道估计误差(NMSE)之和为优化目标的导频复用方式给DUEs分配导频,并结合基于禁忌搜索的粒子群算法给CFUEs分配导频的方案。针对数据功率优化问题,提出了在保证DUEs服务质量下最大化CFUEs中最小频谱效率的方案,并采用二分法进行求解。仿真结果表明,所提出的基于干扰辅助MMSE检测的联合导频分配和功率控制方案有效提高了系统总和频谱效率,且导频开销不会随着D2D数量增加而增加。To solve the interference problem caused by the multiplexing of cell-free massive MIMO network resources in D2D communication,the joint pilot allocation and power control problem of cell-free massive MIMO systems coexisting with D2D communication are studied First,to suppress the interference of D2D users(DUEs)to cell-free users(CFUEs),an interference-assisted minimum mean square error(MMSE)detector was proposed;the uplink closure spectral efficiency expressions for DUEs and CFUEs based on the interference-assisted MMSE detection were derived for the imperfect channel state conditions.Second,to reduce the guide frequency pollution,for the guide frequency allocation problem,a guide frequency multiplexing method with the optimization objective of minimizing the sum of the system normalized channel estimation errors(NMSE)was proposed to assign guide frequencies to DUEs,and combined with a particle swarm algorithm based on for Tabu search to assign guide frequencies to CFUEs.For the data power optimization problem,the scheme of maximizing the minimum spectral efficiency in CFUEs under guaranteeing the quality of service of DUEs was proposed and solved by the bisection method.Simulation results show that the proposed joint guide frequency allocation and power control scheme based on interference-assisted MMSE detection effectively improves the total sum spectral efficiency of the system and the guide frequency overhead does not increase with the increase in the number of D2D.

关 键 词：去蜂窝大规模MIMO D2D通信 干扰辅助MMSE检测 导频分配 功率控制 

分 类 号：TN929.5[电子电信—通信与信息系统]