基于IRS辅助的MIMO车联网系统联合波束成形设计  

Joint beam forming design for IRS-aided MIMO Internet of vehicles system

作　　者：张雷 王玉 田建杰 张琳 章天骄 ZHANG Lei;WANG Yu;TIAN Jianjie;ZHANG Lin;ZHANG Tianjiao(School of Electrical and Information Engineering,Jiangsu University of Technology,Changzhou 213001,China;National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China)

机构地区：[1]江苏理工学院电气信息工程学院,江苏常州213001 [2]东南大学移动通信国家重点实验室,江苏南京210096

出　　处：《通信学报》2023年第2期59-69,共11页Journal on Communications

基　　金：国家自然科学基金资助项目(No.61901196);东南大学移动通信国家重点实验室开放研究课题基金资助项目(No.2021D14);江苏省教育厅未来网络科研基金资助项目(No.FNSRFP-2021-YB-35);常州市应用基础研究计划基金资助项目(No.CJ20210070);江苏省基础研究计划基金资助项目(No.BK20210941);江苏省高等学校自然科学研究基金资助项目面上项目(No.20KJD510004,No.21KJB510029,No.21KJB510017)。

摘　　要：针对MIMO车联网系统中V2I和V2V共享频谱的情形,提出了一种IRS辅助的联合波束成形设计方法。在保证V2V用户数据速率需求、V2I基站发射功率受限和IRS反射相移模约束等条件下,以最大化V2I用户的信道容量为目标,联合优化基站端发送预编码和IRS端的反射相移矩阵。采用最小均方误差规则、矩阵分析理论和内逼算法把非凸且变量耦合的优化问题转换为解耦后的凸优化问题,并提出一种交替迭代优化算法获得原问题的解。对所提算法的性能进行仿真,分析了IRS反射单元数、IRS部署位置和车速对车联网频谱效率的影响。仿真结果表明,所提算法收敛性较好,若在基站附近部署IRS,利用所提的联合波束成形方法能最大限度地提高车联网频谱效率。A joint beamforming design method assisted by an IRS was proposed in MIMO Internet of vehicles system where the spectrum was shared by V2I and V2V users.Considering the constraints of V2V user’s data rate requirement,transmit power and IRS reflection phase shift,transmit precoding matrix at base station and reflective phase shift matrix of the IRS were jointly optimized to maximize channel capacity of the V2I user.The coupled non-convex optimization problem was decoupled and converted to be convex by using minimum mean square error,matrix analysis and inner approaching algorithm.An alternate iterative optimization algorithm was proposed to find the feasible solution.The performance comparisons of the proposed algorithm with several benchmarks were carried out and the impacts of the number of IRS reflective elements,IRS location and vehicle speed on spectrum efficiency were provided,respectively.The simulation results show that the proposed algorithm can converge quickly and the spectrum efficiency can be maximally improved by using the proposed method if the IRS is deployed near the base station.

关 键 词：智能反射面 车联网 MIMO 波束成形 凸优化 

分 类 号：TN92[电子电信—通信与信息系统]