论文标题
在多功能主动智能反射表面辅助系统中安全通信
Secure Communication in Multifunctional Active Intelligent Reflection Surface-assisted Systems
论文作者
论文摘要
在本文中，研究了由多功能主动智能反射表面（IRS）辅助的多源多输入单输出无线通信系统的安全性能。主动IRS可以同时反映和放大入射信号并发出人造噪声以打击潜在的窃听。我们通过设计活性IRS元素的相位，幅度和IRS模式选择，以及基本站（BS）的预编码器和人工噪声向量来最大程度地减少系统功耗。该设计被称为非凸优化问题，可确保通信安全性。为了解决该问题，本文提出了一种迭代交替算法，以获得有效的亚最佳解决方案。仿真结果表明，所提出的方案比所有考虑的基线方案都具有出色的安全性能，尤其是当窃听天线的数量大于BS时。
In this paper, the secure performance of multiuser multiple-input single-output wireless communications systems assisted by a multifunctional active intelligent reflection surface (IRS) is investigated. The active IRS can simultaneously reflect and amplify the incident signals and emit artificial noise to combat potential wiretapping. We minimize the total system power consumption by designing the phase, amplitude, and IRS mode selection of the active IRS elements, as well as the precoder and artificial noise vector of the base station (BS). The design is formulated as a non-convex optimization problem guaranteeing communication security. To tackle the problem, this paper proposes an iterative alternating algorithm to obtain an effective sub-optimal solution. The simulation results show that the proposed scheme offers superior secure performance over all the considered baseline schemes, especially when the number of eavesdropper antennas is more than that of the BS.
