Key result
The proposed MIMO bio-radar system successfully detected human vital signs and estimated the direction of arrival of a human target at angles between -50° and 50°.
A novel MIMO bio-radar system can successfully detect human vital signs and estimate the direction of arrival, with potential applications in home health care and surveillance.
Should not yet alter clinical monitoring; leaves open validation of MIMO bio-radar for cardiovascular applications.
This paper presents a non-contact measurement method of vital signal by the use of multiple-input multiple-output (MIMO) bio-radar system, configured with two antennas that are separated by a certain distance. The direction of arrival (DOA) estimation algorithm for coherent sources was applied to detect vital signals coming from different spatial angles. The proposed MIMO bio-radar system was composed of two identical transceivers sharing single VCO with a PLL. In order to verify the performance of the system, the DOA estimation experiment was completed with respect to the human target at angles varying between -50∘ and 50∘ where the bio-radar system was placed at distances (corresponding to 50 cm and 95 cm) in front of a human target. The proposed MIMO bio-radar system can successfully find the direction of a human target.
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An et al. (2010) studied this question. MIMO bio-radar system was evaluated on Direction of arrival (DOA) estimation and vital sign detection. The proposed MIMO bio-radar system successfully detected human vital signs and estimated the direction of arrival of a human target at angles between -50° and 50°.
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