一种智能超表面辅助的非视距安全通信方法  

Reconfigurable intelligent surface-assisted non-line-of-sight secure communication scheme

作　　者：高建邦[1] 高国旺[1] GAO Jianbang;GAO Guowang(School of Electronic Engineering,Xi’an Shiyou University,Xi’an,710065,China)

机构地区：[1]西安石油大学电子工程学院,陕西西安710065

出　　处：《西安电子科技大学学报》2023年第2期64-70,共7页Journal of Xidian University

基　　金：陕西省教育厅专项科研计划(22JK0508);中国科学院战略性先导科技专项(A类)子课题(XDA14030103)。

摘　　要：针对发射机与期望用户之间存在阻挡时的非视距物理层安全传输问题,提出了智能超表面辅助的阵列天线物理层安全通信方法。首先,建立智能超表面阵列天线系统模型,通过阵列天线直传链路和智能超表面反射链路完成无线系统的安全通信。随后,针对窃听者被动接收信号,无法确定窃听者具体位置的情况,提出了在确保期望用户可靠接收信号的同时以最大化人工噪声干扰功率为目标联合优化发射波束成形矢量和智能超表面反射系数矩阵的优化方法。最后,分析优化问题,并利用辅助变量和半定松弛等方法得到最优解,达到抑制窃听者接收信号的同时,确保期望用户可靠和安全通信的目的。仿真实验证实,智能超表面辅助的物理层安全通信方法提高了非视距场景下信息传输的可靠性与安全性。Aiming at the problem of physical layer security transmission when there is no direct transmission link between transmitter and desired user,a physical layer transmission scheme based on the reconfigurable intelligent surface(RIS)is proposed.This dissertation first establishes an RIS array antenna system model.The secure communication of the wireless system is completed through the array antenna direct transmission link and the RIS reflection link.Furthermore,in view of the situation that eavesdropers passively receive information and cannot determine the specific location of eavesdropers,the dissertation optimizes the transmitting beamforming vector and the RIS coefficient matrix to maximize artificial noise interference power while ensuring reliable signal reception for the desired user.The non-convex quadratic problem is transformed into an equivalent convex problem by using auxiliary variables and semidefinite relaxation methods.The transmitting beamforming vector and reflection coefficient matrix of the intelligent reflector are optimized jointly,which can restrain the eavesdropper from receiving information and ensure the reliable and secure communication of expected users.Finally,simulation results show that the secure transmission scheme based on the RIS improves the reliability and security of information transmission.

关 键 词：物理层安全 智能超表面 非视距安全传输 

分 类 号：TN92[电子电信—通信与信息系统]