Secrecy Outage Analysis in Random Wireless Networks With Antenna Selection and User Ordering
Secrecy Outage Analysis in Random Wireless Networks With Antenna Selection and User Ordering
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DOI：
10.1109/lwc.2017.2689024
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发表时间：
2017-03
影响因子：
6.3
通讯作者：
Gaojie Chen;J. Coon
中科院分区：
文献类型：
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作者：
Gaojie Chen;J. Coon
本文研究了基于两个排序指标的有序用户设备（UE）下行链路中的保密中断概率。根据泊松点过程随机定位ue和独立作用窃听器（ed）。为了提高基站的保密性能，我们考虑了一种发射天线选择（TAS）方案，并提出了两个指标来订购终端：一个是基于从基站到终端的长期平均信道增益信息，另一个是基于瞬时信道增益。我们导出了受每种排序策略约束的保密中断概率的封闭形式表达式，并通过蒙特卡罗模拟验证了我们的计算。我们的研究结果表明，虽然TAS相对于单天线系统的性能有所提高，但TAS系统的保密中断概率实际上随着路径损耗指数的增加而增加。此外，我们表明，在这些系统中采用的特定用户订购策略的重要性在高路径损耗环境或使用大量天线的情况下降低了。
This letter investigates the secrecy outage probability in the downlink with ordered user equipment (UE) based on two ordering metrics. UEs and independently acting eavesdroppers (EDs) are positioned randomly according to a Poisson point process. We consider a transmit antenna selection (TAS) scheme at the base station (BS) to enhance secrecy performance and propose two metrics to order the UEs: one based on long-term average channel gain information from the BS to the UEs, and the other based on instantaneous channel gains. We derive closed form expressions for the secrecy outage probability subject to each of these ordering policies and verify our calculations through Monte Carlo simulations. Our results show that while TAS yields a performance improvement relative to single-antenna systems, the secrecy outage probability for TAS systems actually increases with the path loss exponent. Furthermore, we show that the importance of the specific user ordering policy that is adopted in these systems is reduced for high path loss environments or situations where large numbers of antennas are employed.