Wital: A COTS WiFi Devices Based Vital Signs Monitoring System Using NLOS Sensing Model

Vital sign (breathing and heartbeat) monitoring is essential for patient care sleep disease prevention. Most current solutions are based on wearable sensors or cameras; however, the former could affect quality, while latter often present privacy concerns. To address these shortcomings, we propose Wital, a contactless vital system low-cost widespread commercial off-the-shelf (COTS) Wi-Fi devices. There two challenges that need to be overcome. First, torso deformations caused by breathing/heartbeats weak. How can such effectively captured? Second, movements as turning over accuracy of monitoring. detrimental effects avoided? For former, non-line-of-sight (NLOS) sensing model modeling relationship between energy ratio line-of-sight (LOS) NLOS signals capability using Ricean K theory use this guide construction better capture breathing/heartbeats. latter, motion segmentation method regularity detection accurately distinguishes respiration from other motions, remove periods include eliminate effects. We have implemented validated Wital COTS The experimental results demonstrate effectiveness in signs.