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Secrecy performance analysis of amplify-and-forward cooperative network with relay selection in the presence of multiple eavesdroppers
Wireless Networks ( IF 3 ) Pub Date : 2021-05-03 , DOI: 10.1007/s11276-021-02611-4
Mohammad Torabi , Sahar Parkouk , Saeed Shokrollahi

The use of wireless transmission networks in various environments has become widespread. One of the main challenges in wireless networks is that the wireless transmission is highly vulnerable to eavesdropping attacks. In this paper, an amplify-and-forward cooperative relaying wireless system with relay selection is considered to improve the physical layer (PHY) security of the wireless system in the presence of multiple eavesdroppers, under two cases, namely, perfect channel state information (CSI) and outdated CSI cases. To evaluate the PHY security of the system, we derive closed-form expressions for the PHY security performance metrics, including the probability of non-zero secrecy capacity, the average secrecy capacity, and the secrecy outage probability. Then using those expressions, we obtain several numerical results under system parameters. The results show that relay selection provides significant improvement in the PHY security of the system. Moreover, it is observed that, when the CSI used to select the best relay is outdated, the PHY secrecy performance is relatively inferior compared to that of the perfect CSI case. Finally, the obtained mathematical expressions are also validated using Monte-Carlo simulation.



中文翻译:

多个窃听者存在中继选择的放大转发协作网络的保密性能分析

无线传输网络在各种环境中的使用已经变得广泛。无线网络的主要挑战之一是无线传输极易受到窃听攻击。本文考虑了具有中继选择的放大转发协作中继无线系统,以在存在多个窃听者的情况下提高无线系统的物理层(PHY)安全性,在两种情况下,即完美的信道状态信息( CSI)和过时的CSI案例。为了评估系统的PHY安全性,我们导出了PHY安全性能指标的闭式表达式,包括非零保密容量的概率,平均保密容量和保密中断概率。然后使用这些表达式,在系统参数下获得几个数值结果。结果表明,中继选择可显着改善系统的PHY安全性。此外,可以观察到,当用于选择最佳中继的CSI已过时时,与完美CSI情况相比,PHY的保密性能相对较差。最后,还使用蒙特卡洛模拟对获得的数学表达式进行了验证。

更新日期:2021-05-03
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