耦合相移下有源同时反射和透射智能反射面辅助的多用户安全通信  

Active Simultaneously Transmitting and Reflecting Reconfigurable Intelligent Surface Assisted Multi-user Security Communication with Coupled Phase Shift

作　　者：郝万明[1,2] 曾齐 王芳 杨守义[1] HAO Wanming;ZENG Qi;WANG Fang;YANG Shouyi(School of Information Engineering,Zhengzhou University,Zhengzhou 450001,China;National Mobile Communications Research Laboratory,Southeast University,Nanjing 210096,China)

机构地区：[1]郑州大学电气与信息工程学院,郑州450001 [2]东南大学移动通信全国重点实验室,南京210096

出　　处：《电子与信息学报》2024年第9期3544-3552,共9页Journal of Electronics & Information Technology

基　　金：国家自然科学基金(62101499);东南大学移动通信全国重点实验室开放研究基金(2024D12)。

摘　　要：无源智能反射面在增强无线通信系统和提高物理层安全方面极具潜力,但是其存在严重的“双衰落”和半区域覆盖的缺点。为此,该文研究了一种有源同时反射和透射智能反射面(STAR-RIS),并在考虑反射和透射相移互耦合条件下,建立一个联合优化基站波束和有源STAR-RIS波束的安全能效最大化问题。为求解所形成的非凸优化问题,利用连续凸近似、罚函数法、半正定松弛、交替优化技术将原问题转化为凸问题,并提出一种基于惩罚对偶分解算法。仿真结果验证了该文所提算法的有效性。Passive intelligent reflecting surfaces hold great potential in enhancing wireless communication systems and improving physical layer security,but they suffer from significant drawbacks such as“double fading”and partial coverage.Therefore,an active Simultaneously Transmitting And Reflecting Reconfigurable Intelligent Surface(STAR-RIS)is conducted in this paper.Considering the coupling between reflection and transmission phase shifts,a joint optimization problem for maximizing the security energy efficiency of base station beams and active STAR-RIS beams is formulated.To solve the resulting non-convex optimization problem,continuous convex approximation,penalty function method,semi-definite relaxation,and alternating optimization techniques are employed to transform the original problem into a convex one.Additionally,a penalty dual decomposition algorithm is proposed.Simulation results validate the effectiveness of the algorithm proposed in this paper.

关 键 词：智能反射面 物理层安全 安全能效最大化 耦合相移 

分 类 号：TN92[电子电信—通信与信息系统]