Blind Separation of Human Heartbeats and Breathing by the use of a Doppler Radar Remote Sensing

The combined use of a Doppler radar with digital signal processing technique gives an effective non-invasive remote sensing of heart beat signals. Initial results have showed that the proposed technique is very promising in successfully isolating desired heart beat signals from other mobile objects and other distortion effects characterizing the wireless channel. We concentrate in this paper on the harder problem of separating at low SNR the signals from two subjects in the same room. We show that preliminary results obtained by the real analytical constant modulus algorithm (RACMA) and the independent component analysis (ICA) on experimental data are very promising into this goal.

1. INTRODUCTION

Unobtrusive and non-invasive means for detection and monitoring of human physiological signals would provide a powerful tool in several areas including health care, critical responses in emergencies, surveillance, etc. [1], [2], [3], [4].