Doppler radar based non-contact multi-person respiration signals separation

Non-contact vital signs monitoring system based on Doppler radar has been becoming more and more attractive in the field of health care. In this paper, a non-contact wireless health monitoring system is presented. The monitoring system is capable of separating the mixed multi-person respiration signals without physically contacting them by using a continuous wave (CW) Doppler radar system. Experimental results show that the mixed respiration signals are successfully separated by the means of Blind Source Separation processing, and the estimation of respiration rates are very close to the actual values. The system can be used to monitor the respiration and calculate the respiration rates of elderly people when they fall ill or sleep at home.