Security Monitoring System Based on Channel State Information

Abstract

Abstract: 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 〖WTHX〗v〖WTBX〗*t={σ, MaxPt, MinPt, E} as the intrusion feature and obtains the value of 〖WTHX〗v〖WTBX〗*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%.

Key words: RSSI, OFDM, CSI, security monitoring, wireless sensing

WANG Li, SUN Xuan-chen, JIANG Shao-wei, E Wan-lin, LI Jia-kang, LU Yu-lan. Security Monitoring System Based on Channel State Information[J]. Computer and Modernization, 2021, 0(11): 118-126.

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