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Complex signal demodulation and random body movement cancellation techniques for non-contact vital sign detection

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2 Author(s)
Changzhi Li ; University of Florida, Gainesville, 32611, USA ; Jenshan Lin

A complex signal demodulation technique is proposed to eliminate the null detection point problem in non-contact vital sign detection. This technique is robust against DC offset in direct conversion system. Based on the complex signal demodulation, a random body movement cancellation technique is developed to cancel out strong noise caused by random body movement in non-contact vital sign monitoring. Multiple transceivers and antennas with polarization and frequency multiplexing are used to detect signals from different body orientations. The noise due to random body movement is cancelled out based on different patterns of the desired and undesired signals. Experiments by highly compact 5 - 6 GHz portable radar systems have been performed to verify these two techniques.

Published in:

Microwave Symposium Digest, 2008 IEEE MTT-S International

Date of Conference:

15-20 June 2008