Secure Active Intelligent Reflecting Surface Communication against Colluding Eavesdroppers

Jiaxin Xu, Yuyang Peng (), Runlong Ye, Wei Gan, Fawaz AL-Hazemi and Mohammad Meraj Mirza
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Jiaxin Xu: The School of Computer Science and Engineering, Macau University of Science and Technology, Macau 999078, China
Yuyang Peng: The School of Computer Science and Engineering, Macau University of Science and Technology, Macau 999078, China
Runlong Ye: The School of Computer Science and Engineering, Macau University of Science and Technology, Macau 999078, China
Wei Gan: The School of Computer Science and Engineering, Macau University of Science and Technology, Macau 999078, China
Fawaz AL-Hazemi: Department of Computer and Networking Engineering, University of Jeddah, Jeddah 21959, Saudi Arabia
Mohammad Meraj Mirza: Department of Computer Science, College of Computers and Information Technology, Taif University, P.O. Box 11099, Taif 21944, Saudi Arabia

Mathematics, 2024, vol. 12, issue 10, 1-19

Abstract: An active intelligent reflecting surface (IRS)-assisted, secure, multiple-input–single-output communication method is proposed in this paper. In this proposed scheme, a practical and unfavorable propagation environment is considered by assuming that multiple colluding eavesdroppers (Eves) coexist. In this case, we jointly optimize the beamformers of the base station (BS) and the active IRS for the formulated sum secrecy rate (SSR) maximization problem. Because the formulated problem is not convex, we apply the alternating optimization method to optimize the beamformers for maximizing the SSR. Specifically, we use the semi-definite relaxation method to solve the sub-problem of the beamforming vector of the BS, and we use the successive convex approximation method to solve the sub-problem of the power amplification matrix of the active IRS. Based on the solutions obtained using these stated methods, numerical results show that deploying an active IRS is superior compared to the cases of a passive IRS and a non-IRS for improving the physical layer security of wireless communication with multiple colluding Eves under different settings, such as the numbers of users, Eves, reflecting elements, and BS antennas as well as the maximum transmit power budget at the BS.

Keywords: active IRS; colluding eavesdroppers; sum secrecy rate; physical layer security (search for similar items in EconPapers)
JEL-codes: C (search for similar items in EconPapers)
Date: 2024
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