A Simple Concurrent Parameter Estimation Method Suitable for Noncontact Vital Sensing Using a Doppler Sensor

In this paper, a simple concurrent parameter estimation method for multiple periodic signals is proposed, which provides extensive performance evaluations through computer simulations. This method is suitable for vital sensing using a Doppler sensor. It enables us to simultaneously estimate the number of targets, periods, directions, and fundamental waveforms of each of the multiple targets. Particularly, simulation results clarify that the proposed method allows estimating the directions of multiple targets even if the number of the targets exceeds the degree of freedom of receiver antennas. In addition, it is emphasized that the direction estimation by the proposed method is robust against the coherence among the incoming signals.