窃听多天线的多用户调度安全性能分析

Multiuser Scheduling Security Performance Analysis of Wiretapping Multiple Antennas

物理层安全作为一种密钥缺省的安全方案,逐渐成为信息安全和无线通信两个领域的交叉热点,其主要利用物理层传输资源保证合法接收者正常通信,同时抑制窃听信道通信。针对这一特点,提出了基于无线通信网络中窃听用户多天线、发送端多用户调度,合法接收端选择最好用户的模型,这时窃听用户进行随机选择,分析这种情况下主信道信噪比、窃听信道信噪比、安全传输速率以及窃听用户天线数目对系统安全性能的影响。仿真结果表明,窃听信道多天线时中断概率增加,即降低了系统的安全性能,但增加发送端用户数目、降低窃听信道信噪比、增加主信道信噪比可以显著提高系统的安全速率。同时证明,这种方案同随机选择发送用户相比较,切实提高了系统的安全性能。

Physical layer security,as a key default security scheme,has become a hotspot in information security and wireless communications.It mainly uses the physical layer to transmit resources to ensure normal communications for legitimate receivers and intercepts eavesdropping channel communications.In view of this feature,a model is proposed for selecting the best user based on multi-antennae overhearing user in wireless communication network,multi-user scheduling at sending end,and legitimate receiving end.At this moment,the user of tapping is randomly selected and the main channel letter Noise ratio,eavesdropping channel signal to noise ratio,secure transmission rate and the number of eavesdropping users on the system security performance are analyzed.Simulation results show that the probability of interception is increased when eavesdropping on multiple antennas of the channel,which reduces the security of the system.However,increasing the number of users at the transmitting end,reducing the signal to noise ratio of the eavesdropping channel and increasing the signal to noise ratio of the primary channel,can significantly improve the security rate of the system.At the same time,this scheme proves that the security of the system is improved,compared with the random choice of sending users.