Wireless LAN-Based CSI Monitoring System for Object Detection

Sensing services for the detection of humans and animals by analyzing the environmental changes of wireless local area network (WLAN) signals have attracted attention in recent years. In object detection using WLAN signals, a widely known technique is the use of time changes in received signal stren...

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Bibliographic Details
Published in:Electronics (Basel) 2018-11, Vol.7 (11), p.290
Main Authors: Murakami, Tomoki, Miyazaki, Masahiko, Ishida, Shigemi, Fukuda, Akira
Format: Article
Language:English
Subjects:
Access control
Bandwidths
Global positioning systems
GPS
Local area networks
Localization
Monitoring
Monitoring systems
Object recognition
Orthogonal Frequency Division Multiplexing
Packets (communication)
Signal strength
Wireless communications
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Summary:Sensing services for the detection of humans and animals by analyzing the environmental changes of wireless local area network (WLAN) signals have attracted attention in recent years. In object detection using WLAN signals, a widely known technique is the use of time changes in received signal strength indicators that are easily measured between WLAN devices. Utilizing channel response, including power and phase values per subcarrier on multiple input multiple output (MIMO), the orthogonal frequency division multiplexing transmission was researched as channel state information (CSI) to further improve detection accuracy. This paper describes a WLAN-based CSI monitoring system that efficiently acquires the CSI of multiple links in a target area where multiple CSI measuring stations are distributed. In the system, a novel CSI monitoring station captures wireless packets sent within the area and extracts CSI by analyzing the packets on the sounding protocol, specified by IEEE 802.11ac. The paper also describes the system configuration and shows that indoor experimental measurements confirmed the system’s feasibility.
ISSN:2079-9292
2079-9292
DOI:10.3390/electronics7110290