混合可重构智能表面和人工噪声辅助的物理层安全通信
Physical Layer Security for Hybrid Reconfigurable Intelligent Surface and Artificial Noise Assisted Communication
邓志祥 1戴陈庆 2张志威2
作者信息
- 1. 河海大学江苏省输配电装备技术重点实验室 常州 213251;河海大学信息科学与工程学院 常州 213251
- 2. 河海大学信息科学与工程学院 常州 213251
- 折叠
摘要
针对可重构智能表面(Reconfigurable Intelligent Reflecting Surface,RIS)辅助的物理层安全通信,该文设计了基于混合有源-无源RIS和人工噪声(Artificial Noise,AN)辅助的安全传输方案.考虑基站和RIS的功率约束以及RIS无源反射元件的反射系数恒模约束,以最大化系统安全传输速率为目标,构建基站发射波束成形、AN波束向量、RIS反射系数矩阵联合优化问题.使用交替优化(Alternating Optimization,AO)、权值最小均方误差(Weighted Minimum Mean Square Error,WMMSE)和半定松弛(Semi-definite Relaxation,SDR)算法,求解所构建的变量高度耦合的非凸优化问题.仿真结果表明,混合RIS辅助安全传输方案,能够有效提高系统的安全速率,与无源RIS相比,能够有效克服"双衰落"效应导致的安全速率降低,与有源RIS相比,具有更高的能量效率.
Abstract
A hybrid active-passive Reconfigurable Intelligent reflecting Surface(RIS)and Artificial Noise(AN)based transmission scheme is proposed for the secret communication of the RIS assisted wireless communication system.Aiming at maximizing the secrecy rate,a joint optimization problem over the transmit beamforming and AN vector of the base station and the reflecting coefficient matrix of the RIS is formulated.Then,the Alternating Optimization(AO)method,the weighted Minimum Mean Square Error(MMSE)algorithm and the semi-definite relaxation algorithm are proposed to solve this non-convex optimization problem with highly-coupled variables.The simulation results show that the proposed hybrid RIS and AN based scheme can efficiently improve the secrecy rate of the considered system and overcome the secrecy rate decrease due to the"double fading"effect of the passive RIS.Compared with the full active RIS,the proposed scheme achieves higher energy efficiency.
关键词
可重构智能表面/混合有源-无源RIS/物理层安全/人工噪声/交替优化/半定松弛Key words
Reconfigurable intelligent reflecting surface/Hybrid active-passive RIS/Physical layer security/Artificial noise/Alternating optimization/Semi-definite relaxation引用本文复制引用
基金项目
江苏省输配电装备技术重点实验室开放课题资助项目(2022JSSPD03)
出版年
2024
NETL
NSTL
万方数据