Secure Transmission Strategy for Intelligent Reflecting Surface Enhanced Wireless System

被引:43
作者
Feng, Biqian [1 ]
Wu, Yongpeng [1 ]
Zheng, Mengfan [2 ]
机构
[1] Shanghai Jiao Tong Univ, Dept Elect Engn, Minhang 200240, Peoples R China
[2] Imperial Coll London, Dept Elect & Elect Engn, London SW7 2AZ, England
来源
2019 11TH INTERNATIONAL CONFERENCE ON WIRELESS COMMUNICATIONS AND SIGNAL PROCESSING (WCSP) | 2019年
关键词
intelligent reflecting surface; physical layer security; beamforming vector; phase shift; COMPLEX QUADRATIC OPTIMIZATION;
D O I
10.1109/wcsp.2019.8928063
中图分类号
TP3 [计算技术、计算机技术];
学科分类号
0812 ;
摘要
In this paper, we investigate the design of secure transmission frameworks with an intelligent reflecting surface (IRS). Our design aims to minimize the system energy consumption in cases of rank-one and full-rank access point (AP)-IRS links. To facilitate the design, the problem is divided into two parts: design of beamforming vector at AP and phase shift at IRS. In the rank-one channel model, the beamforming vector design and phase shift design are independent. A closed-form expression of beamforming vector is derived. Meanwhile, some algorithms, including the semidefinite relaxation algorithm and projected gradient algorithm, are taken to solve the phase shift problem in the case of instantaneous channel, and in the statistical channel model, the impact of phase shift on the overall system is analyzed. However, since beamforming and phase shift depend on each other in the full-rank model, we refer to conventional wiretap model and utilize an eigenvalue-based algorithm to obtain beamforming vector, while the aforementioned two phase optimization schemes are also applied. Simulation results show that the IRS-enhanced system is envisioned to improve physical layer security.
引用
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页数:6
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