基于多天线中继认知网络的安全性能研究

Analysis of the Secrecy Performance of a Multi-antenna Relay Cognitive Network

认知无线电技术的出现对于提高现有的频谱资源利用率起着至关重要的作用。本篇文章研究了存在多天线中继认知网络的安全性能,对存在单中继、单个接受者和单个窃听者,并且全部配备多天线的认知中继网络的安全性能进行了分析。我们假设所有信道均服从瑞利衰落信道,并且多天线中继采用最大比合并/发送天线选择方案(MRC/TAS)的信号处理技术。在文章最后我们推导出了系统的安全中断概率的闭合表达式,并且分析了各个参数对系统的安全性能影响。最后,通过蒙特卡洛仿真验证了理论分析的准确性。

The emergence of cognitive radio technology plays a crucial role in improving the utilization of existing spectrum resources.This paper analyzes the secrecy performance of a multi-antenna relay cognitive network with single relay,single receiver and single eavesdropper and all equipped with multiple antennas.We assume that all channels follow Rayleigh fading channels and multi-antenna relay receives and transmits information using maximum ratio combining/transmitting antenna selection（ MRC/TAS）.At the end of the article,the closed-form expressions for the secrecy outage probability is derived and we analyze the influence of each parameter on the secrecy performance of the system.Finally,the accuracy of theoretical analysis is verified by Monte Carlo simulation.