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The idea of exploiting the Wi-Fi bursts as the medium for sensing purposes,particularly for the human targets in the indoor environment, was cultivated inboth radar and computer science communities and it has became a noticeableresearch genre with cross-disciplinary impact in security, healthcare,human-machine interaction etc.This article comparatively introduces passiveradar based and channel state information (CSI) based approaches. For eachmeans, the primary design principles, signal processing and representativeapplications scenarios are shown. At last, some opportunities and challenges ofWi-Fi sensing are pointed out for the sake of stepping closer to thepractitioners and end-users.

Using Wi-Fi Signal as Sensing Medium: Passive Radar, Channel State Information and Followups