多用户调度在中继网路中的安全性能分析

摘要

无线通信系统中,多用户调度能够有效提高系统频谱的利用效率和吞吐量,从无线通信的物理层安全角度出发,分析了多用户调度在无线通信网络中安全性能,考虑了一种最坏通信场景,即窃听者不但从普通用户而且也从中继节点来窃听被传送的信息,在此基础上提出了一种有效的用户调度算法并得到理论表达式,最后通过仿真实验来分析安全中断概率和信息传输速度以及传输能量的关系,仿真结果表明:该理论表达式的正确性即理论表达式与蒙特卡罗仿真一致;改进的调度方法相对传统的多用户轮询调度方式有显著的优点,降低了通信系统的安全中断概率,有效提高了系统的通信安全.%In wireless communication systems,multi-user scheduling can improve thespectrum utilization efficiency and system throughput.In this paper,a proposed scheduling scheme is studied on the basis of physical layer security,and a worst communication scenario is considered,i.e.the unauthorized receiver eavesdrops not only from users but also from the relay node.The simulation results show the correctness of the theoretical expression,i.e.the expression is consistent with Monte Carlo simulation;and as compared with the traditional polling scheme,the proposed scheme achievesa lower outage probability of the communication system,and effectively improves the security of the system.