Intelligent Reflecting Surface-Aided Secure and Covert Communications  

作　　者：Zhou Xiaobo Jiang Yong Xia Tingting Xia Guiyang Shen Tong 

机构地区：[1]School of Information and Artificial Intelligence,Anhui Agricultural University,Anhui 230036,China

出　　处：《China Communications》2024年第9期1-10,共10页中国通信（英文版）

基　　金：supported in part by National Natural Science Foundation of China under Grant 62371004 and Grant 62301005;in part by the University Synergy Innovation Program of Anhui Province under Grant GXXT-2022-055;in part by the Natural Science Foundation of Anhui Province under Grant 2308085QF197;in part by the Natural Science Research Project of Education Department of Anhui Province of China under Grant 2023AH051031。

摘　　要：This work employs intelligent reflecting surface(IRS)to enhance secure and covert communication performance.We formulate an optimization problem to jointly design both the reflection beamformer at IRS and transmit power at transmitter Alice in order to optimize the achievable secrecy rate at Bob subject to a covertness constraint.We first develop a Dinkelbach-based algorithm to achieve an upper bound performance and a high-quality solution.For reducing the overhead and computational complexity of the Dinkelbach-based scheme,we further conceive a low-complexity algorithm in which analytical expression for the IRS reflection beamforming is derived at each iteration.Examination result shows that the devised low-complexity algorithm is able to achieve similar secrecy rate performance as the Dinkelbach-based algorithm.Our examination also shows that introducing an IRS into the considered system can significantly improve the secure and covert communication performance relative to the scheme without IRS.

关 键 词：covert communications intelligent reflecting surface physical layer security reflection beamforming 

分 类 号：TN918[电子电信—通信与信息系统]