Device-Free Indoor People Counting Using Wi-Fi Channel State Information for Internet of Things

People/crowd counting is a critical technique in many people-centric Internet of Things (IoT) applications, e.g., security monitoring and energy management for smart homes. Device-free people counting systems can in general be categorized as image-based and non-image-based. Non-image-based methods have the advantages of being economical and nonintrusive, as only ambient wireless signals from off-the-shelf wireless devices such as Wi-Fi are used....