波束赋形
计算机科学
数学优化
最优化问题
发射机功率输出
最大化
隐蔽的
分式程序设计
反射(计算机编程)
凸优化
算法
数学
正多边形
电信
非线性规划
发射机
频道(广播)
语言学
哲学
物理
几何学
非线性系统
量子力学
程序设计语言
作者
Miaomiao Zhu,Kefeng Guo,Yinghui Ye,Liang Yang,Theodoros A. Tsiftsis,Hongwu Liu
出处
期刊:IEEE Wireless Communications Letters
[Institute of Electrical and Electronics Engineers]
日期:2023-12-01
卷期号:12 (12): 2203-2207
标识
DOI:10.1109/lwc.2023.3314625
摘要
In this letter, we investigate covert communications in an active reconfigure intelligent surface (RIS) aided multiple-input single-output non-orthogonal multiple access system. To solve the covert rate maximization problem of joint optimizing the transmit power allocation, transmit beamforming, and reflection beamforming, we decouple the original non-convex problem into three sub-problems and propose an alternative optimization (AO) algorithm to solve the sub-problems. To tackle the rank-1 constrained fractional programming problem of the reflection beamforming optimization, a penalized Dinkelbach algorithm is proposed, while the rank-1 constrained reflection beamforming optimization problem is solved with the aid of a penalty-term. Moreover, the optimal transmit beamforming is derived in a determined way. Numerical results clarify the significantly boosted covert rate achieved by the proposed AO algorithm over that of the passive RIS counterpart.
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