多天线频谱共享认知网络保密中断概率分析

摘要

This paper investigates the secrecy outage performance of maximal ratio combining(MRC) in cognitive radio networks(CRNs) over Rayleigh fading channels. In the considered system,a secondary us-er transmits confidential messages to another secondary user receiver,which is equipped with multiple an-tennas and adopts the MRC scheme to process multiple received signals. Meanwhile,an eavesdropper e-quipped with multiple antennas also adopts the MRC scheme to overhear the transmitted information be-tween secondary transmitter and secondary receiver. Secondary user transmitter adopts an underlay strategy to guarantee the quality of service of the primary user in spectrum sharing. This paper derives an exact closed-form expressions for the secrecy outage probability and analyzes the asymptotic performance. Simu-lation results validate the correctness of the analysis.%针对单输入多输出认知无线电网络,研究了瑞利衰落信道下采用最大比合并时保密中断性能.在所研究的系统中,次用户发射机发送机密信息给另一个次用户接收机,次用户接收机配备多个天线并且采用最大比例合并多个接收信号.同时,拥有多个天线窃听者也采用最大比合并方案偷听次用户发射机和次用户接收机之间传送的信息.频谱共享下次用户发射机工作时必须保证主用户的服务质量.推导了保密中断概率的精确表达式,分析了系统保密中断概率渐近性能.仿真结果验证了分析的正确性.