Secrecy outage analysis of buffer-aided multi-antenna relay systems without eavesdropper's CSI

Xuanxuan Tang, Yueming Cai, Wendong Yang, Yu-zhen Huang, T. Duong, Weiwei Yang
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引用次数: 10

Abstract

This work studies the secrecy outage performance of buffer-aided dual-hop multi-antenna relay systems without eavesdropper's channel state information (CSI). By modeling the dynamic buffer state transitions with the Markov chain, the secrecy outage probability at each state is investigated and the stationary distribution probabilities of all states are subsequently derived. Using the total probability theorem, the closed-form expression of the secrecy outage probability of the system is finally obtained. It demonstrates that due to the fully exploitation of the available channels, the buffer-aided relay selection yields to better performance than Best Relay Selection (BRS), even when less relays and antennas are utilized. It is also shown that the buffer-aided relaying only results in a small performance degradation when the buffers are constrained to finite size, thus can be well applied to practical relaying cooperative networks. Simulation results are given to verify the theoretical analysis.
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无窃听者CSI的缓冲辅助多天线中继系统保密中断分析
本文研究了无窃听者信道状态信息(CSI)的缓冲辅助双跳多天线中继系统的保密中断性能。利用马尔可夫链对动态缓冲状态转换进行建模,研究了各状态下的保密中断概率,并推导了各状态的平稳分布概率。利用全概率定理,得到了系统的保密中断概率的封闭表达式。结果表明,由于充分利用了可用信道,即使使用较少的中继和天线,缓冲辅助中继选择也比最佳中继选择(BRS)产生更好的性能。研究还表明,在缓冲区有限的情况下,缓冲辅助中继只会导致较小的性能下降,因此可以很好地应用于实际的中继合作网络。仿真结果验证了理论分析的正确性。
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