IRS与人工噪声辅助的MIMO通信系统物理层安全方案设计  

Design of physical layer safety scheme aided with IRS and artificial noise for MIMO communication systems

作　　者：景小荣[1,2] 宋振远 罗悦 马玉丹 JING Xiaorong;SONG Zhenyuan;LUO Yue;MA Yudan(School of Communication and Information Engineering,Chongqing University of Posts and Telecommunications,Chongqing 400065,China;Chongqing Key Lab of Mobile Communications Technology,Chongqing 400065,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]移动通信技术重庆市重点实验室,重庆400065

出　　处：《系统工程与电子技术》2022年第10期3266-3274,共9页Systems Engineering and Electronics

基　　金：国家自然科学基金(61701062);重庆市基础与前沿研究计划(cstc2019jcyj-msxmX0079)资助课题。

摘　　要：针对多输入多输出通信系统信息传输过程中的安全问题,提出一种智能反射表面(intelligent reflecting surface,IRS)与人工噪声辅助的物理层安全设计方案。在该方案中,首先基于系统保密速率最大化准则,构建一非凸优化问题。由于该问题求解需联合优化设计基站波束赋形矩阵、人工噪声协方差矩阵及IRS相移矩阵,为易于求解,基于均方误差准则,对非凸目标函数进行等价转换。最后,以交替迭代方式分别利用内点法和基于黎曼流形的共轭梯度下降算法,求解波束赋形矩阵和人工噪声协方差矩阵以及IRS相移矩阵。仿真结果表明,所提方案的系统保密速率在发送端具有较高的发送功率时,优于其他几种方案。For security issues of multiple input multiple output(MIMO)communication system in the process of information transmission,this paper proposes a physical layer security scheme aided by intelligent reflecting surfaces(IRS)and artificial noise.In this scheme,based on the criterion of maximizing the system security rate,a non-convex optimization problem is first constructed involved with the joint design of base station beamforming matrix,artificial noise covariance matrix,and IRS phase shift matrix.Then,in order to make the optimization problem solvable,the non-convex objective function is equivalently transformed based on the mean square error criterion.Finally,the interior point method and the conjugate gradient descent algorithm based on Riemannian manifold are respectively used to obtain the beamforming matrix,the artificial noise covariance matrix,and the IRS phase shift matrix in an alternating iterative manner.Simulation results show that the system security rate of the proposed scheme is superior to other schemes when the sender has high transmission power.

关 键 词：物理层安全 智能反射表面 多输入多输出 人工噪声 黎曼流形优化 

分 类 号：TN918.91[电子电信—通信与信息系统]