Security-Reliability Tradeoff Analysis of Artificial Noise Aided Two-Way Opportunistic Relay Selection
Security-Reliability Tradeoff Analysis of Artificial Noise Aided Two-Way Opportunistic Relay Selection
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DOI：
10.1109/tvt.2016.2601112
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发表时间：
2017-05-01
影响因子：
6.8
通讯作者：
Hanzo, Lajos
中科院分区：
文献类型：
--
作者：
Ding, Xiaojin;Song, Tiecheng;Hanzo, Lajos
在本文中，我们调查的物理层安全的合作通信依赖于多个双向中继使用解码和转发（DF）协议中存在的窃听者，窃听者出现挖掘的源和中继的传输。要解决的设计折衷是，通过调用双向中继提高了吞吐量，但无线传输的保密性可能会降低，因为窃听者可能会偷听到由源节点和中继节点发送的信号。我们设想了一个人工噪声辅助双向机会中继选择（ANaT-WORS）计划，以提高安全的对源节点的多个双向中继的协助下进行通信。此外，我们分析了所提出的ANaTWORS方案的中断概率和拦截概率，其中的安全性和可靠性的特征在于拦截概率和安全中断概率。为了比较，我们还提供了传统的直接传输和单向中继方案的安全性可靠性权衡（SRT）分析。结果表明，建议ANaTWORS计划优于传统的直接传输，以及单向中继方法在其SRT。更具体地说，在低主用户窃听比（MUER）区域，建议ANaTWORS计划是能够保证安全传输，而没有SRT增益是通过传统的单向中继实现的。事实上，单向中继方案在其SRT方面甚至可能劣于传统的直接传输方案。
In this paper, we investigate the physical-layer security of cooperative communications relying on multiple two-way relays using the decode-and-forward (DF) protocol in the presence of an eavesdropper, where the eavesdropper appears to tap the transmissions of both the source and of the relay. The design tradeoff to be resolved is that the throughput is improved by invoking two-way relaying, but the secrecy of wireless transmissions may be degraded, since the eavesdropper may overhear the signals transmitted by both the source and relay nodes. We conceive an artificial noise aided two-way opportunistic relay selection (ANaT-WORS) scheme for enhancing the security of the pair of source nodes communicating with the assistance of multiple two-way relays. Furthermore, we analyze both the outage probability and intercept probability of the proposed ANaTWORS scheme, where the security and reliability are characterized in terms of the intercept probability and the security outage probability. For comparison, we also provide the security-reliability tradeoff (SRT) analysis of both the traditional direct transmission and of the one-way relaying schemes. It is shown that the proposed ANaTWORS scheme outperforms both the conventional direct transmission, as well as the one-way relay methods in terms of its SRT. More specifically, in the low main-user-to-eavesdropper ratio (MUER) region, the proposed ANaTWORS scheme is capable of guaranteeing secure transmissions, whereas no SRT gain is achieved by conventional one-way relaying. In fact, the one-way relaying scheme may even be inferior to the traditional direct transmission scheme in terms of its SRT.