Wi-Fi CSI based Behavior Recognition: From Signals, Actions to Activities
It addresses the problem of accurate behavior recognition for applications in wireless sensing, but is incremental as it reviews existing work without presenting new results.
The paper provides an overview of Wi-Fi Channel State Information (CSI) for device-free, non-intrusive human behavior recognition, classifying applications into signals, actions, and activities, and discusses challenges and open issues.
Human behavior recognition has been considered as a core technology that can facilitate variety of applications. However, accurate detection and recognition of human behavior is still a big challenge that attracts a lot of research efforts. Recent advances in the wireless technology (e.g., Wi-Fi Channel State Information, i.e., CSI) enable a new behavior recognition paradigm, which is able to recognize behaviors in a device-free and non-intrusive manner. In this article, we first provide an overview of the basics of Wi-Fi CSI based behavior recognition. Afterwards, we classify related applications into three-granularity: signals, actions and activities, and then provide some insights for designing new schemes. Finally, we conclude by discussing the challenges, possible solutions to these challenges and some open issues involved in CSI based behavior recognition.