IRS-enabled Breath Tracking with Colocated Commodity WiFi Transceivers
Simon Tewes, Markus Heinrichs, Rainer Kronberger, Aydin Sezgin

TL;DR
This paper demonstrates how IRS technology can significantly improve breath tracking accuracy using commodity WiFi devices by enhancing self-interference cancellation in indoor environments.
Contribution
It introduces an IRS-assisted method for self-interference cancellation in WiFi-based breath tracking, utilizing a 256-element IRS prototype to achieve room-level tracking accuracy.
Findings
Successful breath frequency detection in indoor environments
Effective IRS-assisted self-interference cancellation
Room-level breath tracking with commodity WiFi hardware
Abstract
Intelligent reflecting surfaces (IRS) are a key enabler of various new applications in 6G smart radio environments. By utilizing an IRS prototype system, this paper aims to enhance self-interference (SI) cancellation for breath tracking with commodity WiFi devices. SI suppression is a crucial requirement for breath tracking with a single antenna site as the SI severely limits the radio sensing range by shadowing the received signal with its own transmit signal. To this end, we propose to assist SI cancellation by exploiting an IRS to form a suitable cancellation signal in the analog domain. Building upon a 256-element IRS prototype, we present results of breath tracking with IRS-assisted SI cancellation from a practical testbed. We use inexpensive WiFi hardware to extract the Channel State Information (CSI) in the 5~GHz band and analyze the phase change between a colocated transmitter…
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Taxonomy
TopicsAdvanced Wireless Communication Technologies · Full-Duplex Wireless Communications · Indoor and Outdoor Localization Technologies
