多用户MISO场景的3D波束赋形和IRS反射优化设计  

3D Beamforming and IRS Reflecting Optimization in Multi-user MISO System

作　　者：张颉 杨迎春[2] 李里 ZHANG Jie;YANG Yingchun;LI Li(State Grid Sichuan Electric Research Institute,Chengdu Sichuan 610041,China;State Grid Sichuan Electric Power Company,Chengdu Sichuan 610041,China;School of Information Science and Technology,Southwest Jiaotong University,Chengdu Sichuan 611756,China)

机构地区：[1]国网四川省电力公司电力科学研究院,四川成都610041 [2]国网四川省电力公司,四川成都610041 [3]西南交通大学信息科学与技术学院,四川成都611756

出　　处：《通信技术》2023年第1期1-9,共9页Communications Technology

基　　金：国网四川电科院“基于电力北斗的无人区通信接入技术研究与设备”研制项目(52199720002G)。

摘　　要：针对无线信号易受信道影响的难题,将智能反射面(Intelligent Reflecting Surface,IRS)被动波束赋形和基站(Base Station,BS)3D波束赋形进行联合设计。为最大化加权和速率,首先基于投影梯度下降法和加权均方误差等效原理,提出了一种多用户交替优化算法(Multi-User Alternative Optimization,MU-AO),其具有普适性。其次,基于高信噪比(Signal-to-Noise Ratio,SNR)近似原理,提出了一种多用户三级优化算法(Multi-User Three Stage Optimization,MUTSO),通过计算次优组合解来降低计算复杂度。最后,基于BS天线下倾角预定义策略,提出了一种多用户基于直射链路优化算法(Multi-User Direct-Link Based Optimization,MU-DLBO),能够实现复杂度与性能的均衡。实验表明,所提算法均能有效提升系统加权和速率,体现了联合波束赋形的有效性。To address the problem that wireless signals are susceptible to the channel,the IRS(Intelligent Reflecting Surface)passive beamforming and the BS(Base Station)3D beamforming can be jointly optimized.In order to maximize the weighted sum rate,based on the projected gradient descent method and the weighted mean square error equivalence principle,a MU-AO(Multi-User Alternating Optimization)algorithm is first proposed,which can provide a universal joint beamforming scheme.Then,based on the principle of high SNR(Signal-to-Noise Ratio)approximation,a MU-TSO(Multi-User Three-Stage Optimization)algorithm is proposed,which reduces the computational complexity by obtaining sub-optimal solutions.Finally,a MUDLBO(Multi-User Direct-Link Based Optimization)algorithm is proposed based on predefined strategy of BS antenna tilt angle,which can achieve a balance between complexity and performance.Simulation results indicate that all the proposed algorithms can effectively improve the system weighted sum rate performance,which validates the effectiveness of the joint beamforming.

关 键 词：智能反射面 3D波束赋形 阵列天线 信号处理 联合优化 

分 类 号：TN926[电子电信—通信与信息系统]