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Physical Layer Security Enhancement With Reconfigurable Intelligent Surface-Aided Networks
IEEE Transactions on Information Forensics and Security ( IF 6.8 ) Pub Date : 2021-05-25 , DOI: 10.1109/tifs.2021.3083409
Jiayi Zhang , Hongyang Du , Qiang Sun , Bo Ai , Derrick Wing Kwan Ng

Reconfigurable intelligent surface (RIS)-aided wireless communications have drawn significant attention recently. We study the physical layer security of the downlink RIS-aided transmission framework for randomly located users in the presence of a multi-antenna eavesdropper. To show the advantages of RIS-aided networks, we consider two practical scenarios: Communication with and without RIS. In both cases, we apply the stochastic geometry theory to derive exact probability density function (PDF) and cumulative distribution function (CDF) of the received signal-to-interference-plus-noise ratio. Furthermore, the obtained PDF and CDF are exploited to evaluate important security performance of wireless communication including the secrecy outage probability, the probability of nonzero secrecy capacity, and the average secrecy rate. Monte-Carlo simulations are subsequently conducted to validate the accuracy of our analytical results. Compared with traditional MIMO systems, the RIS-aided system offers better performance in terms of physical layer security. In particular, the security performance is improved significantly by increasing the number of reflecting elements equipped in a RIS. However, adopting RIS equipped with a small number of reflecting elements cannot improve the system performance when the path loss of NLoS is small.

中文翻译:

通过可重新配置的智能表面辅助网络增强物理层安全性

可重构智能表面 (RIS) 辅助无线通信最近引起了极大的关注。我们研究了在存在多天线窃听者的情况下随机定位用户的下行链路 RIS 辅助传输框架的物理层安全性。为了展示 RIS 辅助网络的优势,我们考虑了两个实际场景:使用和不使用 RIS 的通信。在这两种情况下,我们都应用随机几何理论来推导出接收信号干扰加噪声比的准确概率密度函数 (PDF) 和累积分布函数 (CDF)。此外,利用获得的PDF和CDF来评估无线通信的重要安全性能,包括保密中断概率、非零保密容量概率和平均保密率。随后进行蒙特卡罗模拟以验证我们分析结果的准确性。与传统的 MIMO 系统相比,RIS 辅助系统在物理层安全性方面提供了更好的性能。特别是通过增加RIS中配备的反射元件的数量,安全性能得到显着提高。然而,当NLoS的路径损耗较小时,采用配备少量反射元件的RIS并不能提高系统性能。
更新日期:2021-06-08
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