Contactless Detection and Analysis of Human Vital Signs Using Concurrent Dual-Band RF System

This article illustrates application of a concurrent dual-band RF system and Wavelet Transform for contactless detection and analysis of human vital signs (i.e. Heartbeats and Respiration rate) for the first time. The vital signs are captured by a concurrent dual-band measurement setup operating at 2.4/5.2 GHz band. An algorithm using Fourier transform and Wavelet transform is used to notice the vital signs from the phase information signal of the concurrent dual-band RF system. The analysis shows that Wavelet transform gives better prediction of vital sign as compared to Fourier transform. The concurrent dual-band operation yields the advantage of measurement of vital sign signals without a change in measurement conditions at both bands. Simulations are carried out using measured dual-band subsystems in ADS platform. In the experimental setup, signals are measured with a human subject at a distance of 1-m away from the RF transceiver.