Robust Secure Beamforming Algorithm for IRS-Aided Terahertz Satellite Communication Systems

被引：0
|
作者：
Lin M. [1 ]
Li F. [1 ]
Wang Z.-N. [1 ]
Zhao B. [1 ]
Han L. [1 ]
机构：
[1] College of Telecommunications and Information Engineering, Nanjing University of Posts and Telecommunications, Jiangsu, Nanjing
来源：
Tien Tzu Hsueh Pao/Acta Electronica Sinica | 2023年 / 51卷 / 10期
关键词：
intelligent reflecting surface; physical layer security; robust beamforming; satellite communications; terahertz band;
D O I：
10.12263/DZXB.20221285
中图分类号：
学科分类号：
摘要：
In this paper, a robust secure beamforming scheme based on imperfect channel state information (CSI) is proposed for the intelligent reflecting surface (IRS)-aided terahertz satellite communication systems, in order to improve the physical layer security performance of the system. First, we consider a scenario where an IRS-aided terahertz satellite system adopts multicast technique to serve multiple legitimate users in the presence of multiple eavesdroppers in the coverage area, based on which a joint optimization problem is formulated in order to minimize the satellite transmit power under the constraints constructed by the achievable rate (AR) and the achievable secrecy rate (ASR) requirements of each legitimate users. Secondly, considering that AR and ASR are non-convex probabilistic constraints caused by imperfect CSI, an approach associated with the second-order Taylor expansion and S-procedure is proposed to transform the non-convex constraints. Further, the joint optimization scheme of the phase shift of IRS and the transmit power of satellite can be solved by semidefinite programming. Finally, the effectiveness and superiority of the proposed scheme are verified by simulation results. © 2023 Chinese Institute of Electronics. All rights reserved.
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页码：2715 / 2723
页数：8
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