Exploiting Direct Links for Secure STAR-RIS Aided Wireless Communications: Outage and Ergodic Capacity Analysis Over Nakagami-m Fading Channels

IF 6.7 2区 计算机科学 Q1 TELECOMMUNICATIONS
Ashutosh Kumar Yadav;Suneel Yadav;Radhika Gour;Devendra Singh Gurjar;Xingwang Li
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引用次数: 0

Abstract

This paper examines the secrecy performance of a simultaneous transmitting and reflecting reconfigurable intelligent surface (STAR-RIS) empowered wireless communication system, where a base station sends its confidential data through a STAR-RIS to trusted outdoor and indoor users while facing threats from outdoor and indoor eavesdroppers. We also leverage the benefits of direct links between BS and outdoor users along with the STAR-RIS link, whereas indoor users only rely on the STAR-RIS link due to the severe blockages. We derive the secrecy outage probability (SOP) and ergodic secrecy capacity (ESC) expressions for both the users over Nakagami-m fading channels. In addition, we present the asymptotic SOP expressions in high signal-to-noise ratio (SNR) and main-to-eavesdropper ratio (MER) regimes to reveal more insights into the secrecy diversity orders of both users. We then analytically discuss that the high SNR slopes of ESCs for both users are equal to zero. Additionally, we provide an analytical framework to demonstrate the impact of STAR elements on the SOP and ESC performance under two cases of interest: 1) when STAR-RIS is out of service and 2) when RIS consists of a very large number of STAR elements. A tradeoff between the energy efficiency and secrecy capacity is also discussed. Finally, numerical and simulation studies verify our analytical findings.
利用直接链路安全星- ris辅助无线通信:中断和遍历容量分析在Nakagami-m衰落信道
本文研究了同时传输和反射可重构智能表面(STAR-RIS)授权无线通信系统的保密性能,其中基站通过STAR-RIS将其机密数据发送给受信任的室外和室内用户,同时面临来自室外和室内窃听者的威胁。我们还利用了BS和室外用户之间的直接连接以及STAR-RIS链路的好处,而由于严重的阻塞,室内用户仅依赖STAR-RIS链路。导出了两种用户在Nakagami-m衰落信道上的保密中断概率(SOP)和遍历保密容量(ESC)表达式。此外,我们给出了在高信噪比(SNR)和主窃听比(MER)情况下的渐近SOP表达式,以揭示两种用户的保密分集顺序。然后,我们解析地讨论两个用户的ESCs的高信噪比斜率等于零。此外,我们提供了一个分析框架来证明STAR元素在两种情况下对SOP和ESC性能的影响:1)当STAR-RIS停止服务时,以及2)当RIS由大量STAR元素组成时。本文还讨论了能源效率和保密能力之间的权衡。最后,数值和模拟研究验证了我们的分析结果。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
IEEE Transactions on Green Communications and Networking
IEEE Transactions on Green Communications and Networking Computer Science-Computer Networks and Communications
CiteScore
9.30
自引率
6.20%
发文量
181
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