论文标题
安全的无线传输，用于可重构智能表面辅助完整双工系统
Secure Wireless Transmission for Reconfigurable Intelligent Surface Aided Full Duplex Systems
论文作者
论文摘要
这封信考虑了可重构的智能表面（RIS）帮助完整双工（FD）系统中的安全通信。 FD基站（BS）在同一时间频率维度上同时提供上行链路（UL）用户和下行链路（DL）用户，并在窃听器的存在下由RIS辅助。此外，还应用人造噪声（AN）来干扰窃听的通道。我们的目标是通过共同优化发射光束形成，接收光束成形和协方差矩阵，并在RIS处进行被动横梁成形，从而最大程度地提高UL和DL使用者的总和。为了解决非凸问题，我们将其分解为可牵引的子问题，并基于交替的优化框架提出了有效的算法。具体而言，接收波束形成是作为封闭形式解的，而通过使用半芬特松弛（SDR）方法和连续的凸近似（SCA）算法获得了其他变量。模拟结果表明，与其他基线方案相比，我们提出的方案的表现出色。
This letter considers the secure communication in a reconfigurable intelligent surface (RIS) aided full duplex (FD) system. An FD base station (BS) serves an uplink (UL) user and a downlink (DL) user simultaneously over the same time-frequency dimension assisted by a RIS in the presence of an eavesdropper. In addition, the artificial noise (AN) is also applied to interfere the eavesdropper's channel. We aim to maximize the sum secrecy rate of UL and DL users by jointly optimizing the transmit beamforming, receive beamforming and AN covariance matrix at the BS, and passive beamforming at the RIS. To handle the non-convex problem, we decompose it into tractable subproblems and propose an efficient algorithm based on alternating optimization framework. Specifically, the receive beamforming is derived as a closed-form solution while other variables are obtained by using semidefinite relaxation (SDR) method and successive convex approximation (SCA) algorithm. Simulation results demonstrate the superior performance of our proposed scheme compared to other baseline schemes.
