RIS辅助通感一体化:波束成形和反射相移的联合设计  

RIS-assisted Integrated Sensing and Communication:Joint Design of Beamforming and Reflection Phase Shift

作　　者：陶启慧 粟欣[2] 刘蓓[3] 许希斌[2] TAO Qihui;SU Xin;LIU Bei;XU Xibin(School of Communications and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Department of Electronics,Tsinghua University,Beijing 100084,China;Beijing National Research Center for Information Science and Technology,Beijing 100084,China)

机构地区：[1]重庆邮电大学通信与信息工程学院,重庆400065 [2]清华大学电子系,北京100084 [3]清华大学北京信息科学与技术国家研究中心,北京100084

出　　处：《移动通信》2024年第3期61-65,74,共6页Mobile Communications

基　　金：国家重点研发计划项目“6G网络智能化技术研究”(2020YFB1806702)。

摘　　要：ISAC允许通信和雷达共享频谱资源,被视为解决未来无线网络频谱拥塞的一项有前途的技术。当信道退化严重时,仅依靠基站侧天线获得的性能增益十分有限,RIS因其能够创建有利的传播环境已成为一项革命性技术,借助RIS可为ISAC系统创建额外的链路以提高系统性能。基于此,提出RIS辅助ISAC,通过联合设计基站的有源波束成形和RIS的反射相移,以最大化加权和速率与探测功率,并提出了基于加权均方最小误差和分数规划的交替算法来解决这一问题。仿真结果证明在ISAC中部署RIS并合理优化其相移可以有效提升通信和感知的性能。Integrated sensing and communication(ISAC)is recognized as a promising solution to alleviate spectrum congestion in future wireless networks by enabling the sharing of spectral resources between communication and radar systems.However,the performance gains obtained solely from base station antennas are limited under severe channel conditions.Reconfigurable intelligent surfaces(RIS),capable of creating favorable propagation environments,have emerged as a disruptive technique.The introduction of RIS in ISAC systems provides additional links,thereby enhancing overall system performance.This paper proposes a joint design of active beamforming at the base station and reflection phase shifts at the RIS to maximize the weighted sum rate and radar detection power in the RIS-assisted ISAC system.An alternating optimization algorithm based on weighted mean square error and fractional programming is further developed to address this optimization problem.Simulation results confirm that deploying RIS in ISAC systems and optimizing its phase shifts can effectively improve the performance of both communication and sensing functionalities.

关 键 词：通信感知一体化 可重构智能表面 波束成形设计 反射相移设计 

分 类 号：TN911.7[电子电信—通信与信息系统]