Posture recognition to prevent bedsores for multiple patients using leaking coaxial cable

Leaky coaxial cable (LCX) has long been used to cover blind and semi-blind zones in wireless communication. In this paper, we propose a novel system using a LCX. The key idea is to deploy LCX and use wireless information obtained through PHY layer wireless channel state information (CSI).The core application involves identifying multiple patients' postures in bed in order to reduce the formation of pressure ulcers or bedsores on the skin. The indoor installation and periodic recording of postures help monitor and prevent bedsores. The CSI registrations are collected using 802.11n Intel WLAN NICs. These CSI registration signatures are unique for particular posture. The amplitude variation is used for differentiating and classifying the postures for inference.