Secure Full-Duplex Two-Way Relaying Networks With Optimal Relay Selection
Secure Full-Duplex Two-Way Relaying Networks With Optimal Relay Selection
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DOI：
10.1109/lcomm.2017.2655050
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发表时间：
2017-01
期刊：
影响因子：
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通讯作者：
Bin Zhong;Zhongshan Zhang
中科院分区：
文献类型：
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作者：
Bin Zhong;Zhongshan Zhang
通过实现基于解码转发的全双工（FD）双向中继模式，研究了存在窃听者的最优中继选择（ORS）协作通信系统的保密中断概率（SOP）.在瑞利衰落的假设下，推导了各无线链路端到端信号干扰噪声比分布的封闭表达式。此外，给出了所提出的ORS方案的精确SOP的封闭形式的表达式。数值结果表明，所提出的系统的SOP可以大大影响所涉及的几个参数，包括中继的数量，窃听链路的平均信噪比（SNR），和平均剩余自干扰（SI）施加在FD中继。特别是，残留SI的影响被证明是更明显的侵蚀系统的保密性能在低到中等的SNR制度比在高SNR制度。只要残余SI功率不超过背景噪声水平，所提出的FD-TWC方案在SOP方面总是优于传统的半双工模式。
The secrecy outage probability (SOP) of cooperative communication systems with optimal relay selection (ORS) scheme in the presence of an eavesdropper is investigated by implementing decode-and-forward-based full-duplex (FD) two-way relayingmode. Under Rayleigh fading assumptions, the closed-form expressions for the distributions of end-to-end signal-to-interference-plus-noise ratio in each wireless link are derived. Furthermore, the closed-form expression for the exact SOP of the proposed ORS scheme is given out. Numerical results show that the SOP of the proposed system can be substantially impacted by several parameters involved, including the number of relays, the average signal-to-noise ratio (SNR) of eavesdropper links, and the average residual self-interference (SI) imposed on the FD relays. In particular, the impact of residual SI is shown to be more obvious in terms of eroding the system’s secrecy performance in a low-to-medium SNR regime than in a high-SNR regime. As long as the residual SI power is not beyond the background noise level, the proposed FD-TWC scheme can always outperform the conventional half-duplex mode in terms of SOP.