A Survey on the Applications of Wi-Fi Sensing

With the increasing demand for wireless data, more and more Wi-Fi devices are being constructed. Recently, people are not satisfied that Wi-Fi is only used for data exchange. Wi-Fi starts to be used for sensing in various scenarios. To understand the fundamental technology and the development trends of Wi-Fi sensing, this paper provides a comprehensive survey of resent application and performance of Wi-Fi sensing to describe the fundamental technology. Based on the sensing objects, this paper divides Wi-Fi sensing into two categories: dynamic sensing and static sensing. With the emergence of new Wi-Fi technology, Wi-Fi sensing will be developed. This paper also analyses two research trends of Wi-Fi sensing including multi-antenna fusion and multi-sensor fusion, three research challenges: limitation, robustness, and practicality, promising research directions in applications of Wi-Fi sensing.