摘要
针对无线通信系统中的物理层安全问题,研究了同时发射反射智能反射面(simultaneously transmitting and reflecting reconfigurable intelligent surface,STAR-RIS)辅助的安全通信系统的鲁棒传输设计,在考虑硬件损耗的情况下最大限度地提高系统的保密率。首先,采用交替优化迭代的方法,在保持一组变量不变的同时,迭代地优化另一组变量,包括波束赋形向量与STAR-RIS的反射和发射系数;然后,采用连续凸逼近(successive convex approximation,SCA)方法求解优化子问题,采用半定松弛(semi-definite relaxation,SDR)技术解决非凸单位模约束问题,并将得到的结果和只反射智能反射面(reconfigurable intelligent surface,RIS)进行比较。仿真结果表明,所提出的传输设计方案比传统方案更具有鲁棒性,并且STAR-RIS辅助系统的性能要优于只反射RIS辅助系统的性能。
To address the security issues at the physical layer of wireless communication,this paper investigates the robust transmission design of STAR-RIS-assisted secure communication systems.The goal is to maximize system secrecy rate while considering hardware impairments.To solve the above problems,this paper adopts an alternating optimization iteration method,which alternatively optimizes another set of variables,including the beamforming vector and the reflection and transmission coefficients of STAR-RIS,while keeping one set of variables unchanged.Specifically,the successive convex approximation(SCA)method is used to solve optimization sub-problem,and the semi-definite relaxation(SDR)technique is used to solve the non-convex unit modulus constraint problem.The results are compared with those of the reflection-only reconfigurable intelligent surface(RIS).Simulation results show that the proposed transmission design scheme is more robust than the traditional scheme,and STAR-RIS-assisted system outperforms reflection-only RIS-assisted system.
作者
孙艳华
程祎
杨睿哲
李萌
王朱伟
司鹏搏
SUN Yanhua;CHENG Yi;YANG Ruizhe;LI Meng;WANG Zhuwei;SI Pengbo(Faculty of Information Technology,Beijing University of Technology,Beijing 100124,China;Beijing Laboratory of Advanced Information Networks,Beijing 100124,China)
出处
《北京工业大学学报》
北大核心
2025年第12期1494-1501,共8页
Journal of Beijing University of Technology
基金
北京市自然科学基金资助项目(4222002)。
关键词
硬件损耗
安全通信
保密率
智能反射面
波束赋形
连续凸逼近
hardware impairments
secure communication
secrecy rate
reconfigurable intelligent surface(RIS)
beamforming
successive convex approximation(SCA)
