Enhanced Secure Communication via Novel Double-Faced Active RIS

计算机科学 波束赋形 数学优化 缩小 计算机工程 物理层 趋同(经济学) GSM演进的增强数据速率 吞吐量 最优化问题 分布式计算 算法 电信 数学 无线 经济增长 经济 程序设计语言
作者
Yuan Guo,Yang Liu,Qingqing Wu,Qingjiang Shi,Yang Zhao
出处
期刊:IEEE Transactions on Communications [IEEE Communications Society]
卷期号:: 1-1
标识
DOI:10.1109/tcomm.2023.3250454
摘要

Although the reconfigurable intelligent surface (RIS) technology is envisioned promising to enhance communication from all aspects, including physical-layer security, increasing concerns have lately been cast onto its defects—the severe “double-fading” loss and its confined-to-half-space coverage. Diverse novel RIS architectures have recently emerged to partially overcome these shortcomings, yet perfect solution is still absent. This paper proposes a novel double-faced active (DFA)-RIS structure to surmount the above two prominent defects simultaneously. Furthermore, we utilize the DFA-RIS to promote secrecy performance via jointly designing access point (AP)’s beamforming and DFA-RIS configuration towards maximizing sum secrecy rate (SR). The optimization problem is highly challenging due to the constraints deriving from the DFA-RIS architecture, especially the presence of power splitting parameters. By leveraging majorization–minimization (MM) and penalty dual decomposition (PDD) methods, we develop an efficient solution that updates all variables via convex optimization techniques. Our proposed solution is significant and general as it is applicable to all other cutting-the-edge RIS architectures to maximize sum SR, which has not yet been thoroughly worked out. Numerical results verify the convergence and effectiveness of our proposed algorithm and demonstrate that our proposed DFA-RIS architecture outperforms all other state-of-the-art RIS techniques to enhance communication security.
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