Exploiting Ambient Wi-Fi Terminals for Human Presence Detection

This research describes a system for detecting whether people are present in rooms using Wi-Fi Channel State Information, or CSI (data about how Wi-Fi signals travel through space). The system addresses real-world challenges like interference and unreliable connections by using a reference-based denoising method (filtering out unwanted signal noise by comparing against empty-room patterns) and a multi-region strategy that combines data from multiple Wi-Fi links across different areas to improve accuracy in security monitoring applications.