Buffer-aided relay selection for secure two-hop wireless networks with decode-and-forward relays and a diversity-combining eavesdropper
Buffer-aided relay selection for secure two-hop wireless networks with decode-and-forward relays and a diversity-combining eavesdropper
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DOI：
10.1016/j.adhoc.2019.102039
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发表时间：
2020-03
期刊：
影响因子：
4.8
通讯作者：
Xuening Liao;Yuanyu Zhang;Zhenqiang Wu;Xiaohong Jiang
中科院分区：
文献类型：
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作者：
Xuening Liao;Yuanyu Zhang;Zhenqiang Wu;Xiaohong Jiang
本文研究了在具有解码转发（DF）中继的两跳无线网络中实现物理层安全（PLS）的缓冲区辅助中继选择问题。现有的工作主要集中在独立解码窃听者的情况下。然而，更危险的情况下，分集合并窃听者，联合收割机信号在两个跳解码数据包在很大程度上被忽略。本文考虑了两跳无线网络中的多个DF中继和一个分集合并窃听器在两种情况下分别与完美和部分窃听信道状态信息（CSI）。首先，我们提出了两个安全的缓冲区辅助中继选择方案，以抑制窃听者的两个窃听CSI的情况下，分别。然后，我们推导出端到端（E2 E）的安全传输概率（STP）和E2 E延迟的网络的解析表达式。最后，我们提供了大量的仿真和数值结果，以验证表达式的正确性，并调查E2 E STP和E2 E延迟性能。实验结果表明，与传统的Max-ratio缓存辅助中继选择方案相比，该方案能够获得更好的E2 E STP性能，但代价是增加了E2 E时延。
This paper investigates the buffer-aided relay selection issue for achieving physical layer security (PLS) in two-hop wireless networks with Decode-and-Forward (DF) relays. Available works mainly focus on scenarios with independent-decoding eavesdroppers. However, the more hazardous scenarios with diversity-combining eavesdroppers that combine the signals in two hops to decode the packets are largely ignored. This paper considers a two-hop wireless network with multiple DF relays and one diversity-combining eavesdropper under two cases with perfect and partial eavesdropper channel state information (CSI) respectively. We first propose two secure buffer-aided relay selection schemes to suppress the eavesdropper for both eavesdropper CSI cases respectively. We then derive analytical expressions for the end-to-end (E2E) secure transmission probability (STP) and E2E delay of the network. Finally, we provide extensive simulation and numerical results to validate the correctness of the expressions and also to investigate the E2E STP and E2E delay performances. The results showed that the proposed schemes can achieve better E2E STP performance than the well-known Max-ratio buffer-aided relay selection scheme but at the cost of an increased E2E delay.