广东工业大学学报 ›› 2022, Vol. 39 ›› Issue (03): 49-54,69.doi: 10.12052/gdutxb.210072

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可重构智能表面辅助的非正交多址接入系统的安全通信研究

吴家锐, 崔苗, 张广驰, 王丰   

  1. 广东工业大学 信息工程学院， 广东 广州 510006
  • 收稿日期:2021-05-07 出版日期:2022-05-10 发布日期:2022-05-19
  • 通信作者: 崔苗(1978-),女,讲师,博士,主要研究方向为电子信息与无线通信技术,E-mail:cuimiao@gdut.edu.cn
  • 作者简介:吴家锐(1994-)，男，硕士研究生，主要研究方向为可重构智能表面和物理层安全等
  • 基金资助:
    广东省科技计划项目(2019B010119001，2017B090909006，2018A050506015，2020A050515010，2020A0505100012，2021A0505030015)；广东省特支计划项目(2019TQ05X409)

RIS-Assisted Secure Communication in Non-Orthogonal Multiple Access Systems

Wu Jia-rui, Cui Miao, Zhang Guang-chi, Wang Feng   

  1. School of Information Engineering, Guangdong University of Technology, Guangzhou 510006, China
  • Received:2021-05-07 Online:2022-05-10 Published:2022-05-19

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摘要： 可重构智能表面是一种可以通过控制反射元件改变反射信号来改善无线信号传播环境和提高通信安全的有效技术。从物理层安全的角度研究了可重构智能表面辅助的非正交多址接入系统的安全通信，其中多个用户在单天线窃听者存在的情况下，以非正交多址接入的方式同时向单天线基站发送机密信息。研究的目的是通过优化用户的发射功率和可重构智能表面反射元素的相移使系统的总保密率最大化，同时满足发射功率约束、用户服务质量约束和可重构智能表面的每个反射元素的模一约束。虽然涉及的优化问题是非凸的，难以求解，但是本文提出一种基于交替优化和半定松弛的算法求得次优解。仿真结果表明，与2种基准方案对比，所提出的算法一定程度上提高了系统的总保密率，为可重构智能表面辅助的非正交多址接入系统的安全通信研究提供参考。

关键词: 可重构智能表面, 物理层安全, 保密率

Abstract: The reconfigurable intelligent surface (RIS) is an effective technique that can improve wireless signal propagation environment and enhance communication security by adjusting the reflected signal through its controlled reflecting elements. The RIS-assisted secure communication in a non-orthogonal multiple access system is considered, where multiple users simultaneously send confidential information to a single-antenna base station in a non-orthogonal multiple access way in the presence of a single-antenna eavesdropper. Our objective is to maximize the total security rate of the system by optimizing the transmit power of the users and the phase shifts of the reflecting elements of the RIS while satisfying the constraints of transmit power and the quality-of-service for each user, as well as the constant modulus constraint of each reflecting element of the RIS. Although the considered optimization problem is non-convex and difficult to solve, an efficient algorithm based on the alternate optimization and semidefinite relaxation techniques is proposed to obtain a near-optimal solution. Simulation results validate that as compared with two benchmark schemes, the proposed algorithm significantly improves the total security rate of the system. It provides a reference for the secure communication research of reconfigurable intelligent surface assisted non orthogonal multiple access system.

Key words: reconfigurable intelligent surface, physical-layer security, secrecy rate

中图分类号: 

  • TN929.5
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