Abstract
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.
Highlights
The widespread use of mobile devices has explosively increased wireless communication traffic [1]
Against issues described in previous paragraphs, to demonstrate the effectiveness of efficient channel state information (CSI) acquisition and the system’s feasibility based on indoor experimental results, we show a configuration of the system using general wireless local area network (WLAN) devices
We describe the CSI measuring duration obtained in simulations for measuring measuring CSI in the conventional and proposed systems
Summary
The widespread use of mobile devices (e.g., smartphones, tablet personal computers, etc.) has explosively increased wireless communication traffic [1]. From analyzing the RSSI, the average receiving power within the frequency channel between WLAN devices [10,11,12] can be acquired at most WLAN devices with a small amount of information This approach is widely used in the various object detection services. This protocol is composed of a VHT null data packet (NDP) announcement, VHT NDP, VHT compressed beamforming, and beamforming report poll frames.
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