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Exploiting Ambient Wi-Fi Terminals for Human Presence Detection
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Summary
Researchers present a CSI-based Wi-Fi sensing system that detects human presence using opportunistic ambient links from devices such as smartphones, laptops and IoT terminals. The method combines a reference-based subspace denoising step, which models long-term background statistics during unoccupied periods, with multi-region joint sensing that fuses room device-to-AP links and corridor AP-to-AP links. Evaluations in single-room and four-room university deployments report that denoising improves room sensing and multi-region fusion further improves presence inference.