基于信道状态信息的安防监控系统

Security Monitoring System Based on Channel State Information

无线网络的信道状态信息(Channel State Information,CSI)是MIMO系统中反映各个子载波信号频谱特性的重要指标,通过在Linux平台上定制Intel 5300网卡驱动,就可在常规的无线网络通信环境下通过编程实现对CSI数据的实时采集。因CSI信息对环境变化十分敏感,因此可用于构建基于CSI的非接触式环境感知系统。本文以CSI为数据载体,详细梳理基于CSI的无线感知应用,建立基于CSI信号的安防监控系统,能够成功检测人员到访事件。系统提取人员到访时间的CSI信号特征v*t={σ,MaxPt,MinPt,E}并通过实验求得,当其值为v*t={1×10^(-3),[1,2],[1,2],2.0×10^(-4)}时,系统可获得高达99.07%的检测成功率。

CSI is an important index reflecting the spectrum characteristics of each subcarrier signal in the MIMO system.By customizing the Intel 5300 network card driver on the Linux platform,real-time CSI data acquisition can be realized through programming under the conventional wireless network communication environment.CSI information is very sensitive to environmental changes,so it can be used to build a non-contact environment sensing system based on CSI.This paper takes channel state information as data carrier,reviews related applications based on CSI in detail,and establishes an intrusion detection system.The system can successfully detect personnel visit events.The system defines a vector v*t={σ,MaxPt,MinPt,E}as the intrusion feature and obtains the value of v*t as{1×10^(-3),[1,2],[1,2],2.0×10^(-4)}through experiments.Meanwhile,when the size of sliding window is set to 10 seconds,the system can achieve a detection success rate of 99.07%.