Key Laboratory of Modern Teaching Technology, Ministry of Education, Xi'an 710062, China.
School of Computer Science, Shaanxi Normal University, Xi'an 710119, China.
Sensors (Basel). 2023 May 17;23(10):4822. doi: 10.3390/s23104822.
This paper investigates the problem of buffer-aided relay selection to achieve reliable and secure communications in a two-hop amplify-and-forward (AF) network with an eavesdropper. Due to the fading of wireless signals and the broadcast nature of wireless channels, transmitted signals over the network may be undecodable at the receiver end or have been eavesdropped by eavesdroppers. Most available buffer-aided relay selection schemes consider either reliability or security issues in wireless communications; rarely is work conducted on both reliability and security issues. This paper proposes a buffer-aided relay selection scheme based on deep Q-learning (DQL) that considers both reliability and security. By conducting Monte Carlo simulations, we then verify the reliability and security performances of the proposed scheme in terms of the connection outage probability (COP) and secrecy outage probability (SOP), respectively. The simulation results show that two-hop wireless relay network can achieve reliable and secure communications by using our proposed scheme. We also performed comparison experiments between our proposed scheme and two benchmark schemes. The comparison results indicate that our proposed scheme outperforms the max-ratio scheme in terms of the SOP.
本文研究了在具有窃听者的两跳放大转发（AF）网络中，通过缓冲辅助中继选择来实现可靠和安全通信的问题。由于无线信号的衰落和无线信道的广播特性，网络中传输的信号可能在接收端无法解码，或者已经被窃听者窃听。大多数现有的缓冲辅助中继选择方案在无线通信中只考虑可靠性或安全性问题；很少有工作同时考虑可靠性和安全性问题。本文提出了一种基于深度 Q 学习（DQL）的缓冲辅助中继选择方案，同时考虑了可靠性和安全性。然后，我们通过蒙特卡罗模拟，分别从连接中断概率（COP）和保密中断概率（SOP）两个方面验证了所提出方案的可靠性和安全性性能。仿真结果表明，两跳无线中继网络可以通过使用我们提出的方案实现可靠和安全的通信。我们还在我们提出的方案和两个基准方案之间进行了对比实验。对比结果表明，我们提出的方案在保密中断概率方面优于最大比方案。
