期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 72, 期 6, 页码 8210-8215出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2023.3243545
关键词
Beamforming; coupled phase shifts; physical layer security; simultaneous transmission and reflection (STAR)
This study investigates the secure transmission of the simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) aided communication system. A new secure beamforming design is proposed to address the unique full-space mutual eavesdropping in STAR-RIS aided communications, considering the coupled phase shifts of STAR-RISs and the fair secrecy requirement of users. Numerical results show that the proposed scheme achieves higher secrecy capacity than conventional RIS and 4-bit discrete phase shifters are sufficient for secrecy guarantee.
The secure transmission of the simultaneously transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) aided communication system is investigated. Considering the coupled phase shifts of STAR-RISs and the fair secrecy requirement of users, a new secure beamforming design is proposed for addressing the unique full-space mutual eavesdropping in STAR-RIS aided communications. In particular, a penalty-based secrecy beamforming algorithm is proposed to solve the resulting non-convex optimization problem, where closed-form solutions of the coupled phase-shift coefficients are obtained in each iteration. Numerical results demonstrate that 1) the proposed scheme achieves higher secrecy capacity than conventional RIS; 2) 4-bit discrete phase shifters are sufficient for secrecy guarantee.
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