保密
计算机科学
无线
计算机网络
最大化
无线网络
电信
计算机安全
数学优化
数学
作者
Yuling Kong,Yulong Zou,Liangsen Zhai,Yizhi Li
出处
期刊:IEEE Wireless Communications Letters
[Institute of Electrical and Electronics Engineers]
日期:2024-01-01
卷期号:: 1-1
标识
DOI:10.1109/lwc.2024.3400974
摘要
This letter considers an active reconfigurable intelligent surface (ARIS)-aided secure wireless powered communication network (WPCN), where an Internet-of-Things (IoT) device first harvests energy from a hybrid access point (HAP), and then transmits the information to the HAP by utilizing the harvested energy in the presence of multiple eavesdroppers (Eves). To maximize the secrecy rate, we propose an ARIS-aided secure communications (ARIS-SC) scheme with the optimization of the energy transmit beamforming and receive beamforming vector of the HAP, the time allocation and the reflection coefficients at the ARIS. To solve the optimization problem, we apply an alternating optimization (AO) method to decouple the original problem into multiple subproblems. Specifically, we derive a closed-form solution for the optimal receive beamforming vector, and the solutions of the energy transmit beamforming vector, the time allocation and the reflection coefficients are obtained by applying successive convex approximation (SCA) technique. Numerical results show that compared with the passive reconfigurable intelligent surface (PRIS) and non-RIS aided communications methods, the proposed ARIS-SC scheme significantly improves secrecy rate.
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