Joint beamforming design for secure RIS-assisted IoT networks

Niu, Hehao, Lin, Zhi, Chu, Zheng, Zhu, Zhengyu, Xiao, Pei, Nguyen, Huan X. ORCID logoORCID:, Lee, Inkyu and Al-Dhahir, Naofal (2022) Joint beamforming design for secure RIS-assisted IoT networks. IEEE Internet of Things Journal . ISSN 2327-4662 [Article] (Published online first) (doi:10.1109/JIOT.2022.3210115)

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This paper studies secure communication in an internet-of-things (IoT) network, where the confidential signal is sent by an active refracting reconfigurable intelligent surface (RIS)-based transmitter, and a passive reflective RIS is utilized to improve the secrecy performance of users in the presence of multiple eavesdroppers. Specifically, we aim to maximize the weighted sum secrecy rate by jointly designing the power allocation, transmit beamforming (BF) of the refracting RIS, and the phase shifts of the reflective RIS. To solve the non-convex optimization problem, we propose a linearization method to approximate the objective function into a linear form. Then, an alternating optimization (AO) scheme is proposed to jointly optimize the power allocation factors, BF vector and phase shifts, where the first one is found using the Lagrange dual method, while the latter two are obtained by utilizing the penalty dual decomposition method. Moreover, considering the demands of green and secure communications, by applying the Dinkelbach’s method, we extend our proposed scheme to solving a secrecy energy maximization problem. Finally, simulation results demonstrate the effectiveness of the proposed design.

Item Type: Article
Research Areas: A. > School of Science and Technology > Design Engineering and Mathematics
Item ID: 36436
Notes on copyright: © 2022 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works.
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Depositing User: Huan Nguyen
Date Deposited: 04 Oct 2022 15:40
Last Modified: 17 Feb 2023 15:01

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