Enhancement of Remote Vital Sign Monitoring Detection Accuracy Using Multiple-Input Multiple-Output 77 GHz FMCW Radar

Remote non-contact monitoring of human vital signs has recently received lots of attention due to the advancement and availability of millimeter wave (mmWave) radars. These sensors are significantly reduced in size, but still face serious electromagnetic (EM) propagation loss and signal obstructions...

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Bibliographic Details
Published in:IEEE journal of electromagnetics, RF and microwaves in medicine and biology RF and microwaves in medicine and biology, 2022-03, Vol.6 (1), p.111-122
Main Authors: Dai, Toan K. Vo, Oleksak, Kellen, Kvelashvili, Tsotne, Foroughian, Farnaz, Bauder, Chandler, Theilmann, Paul, Fathy, Aly E., Kilic, Ozlem
Format: Article
Language:English
Subjects:
Accuracy
arctangent demodulation (AD)
Continuous radiation
Continuous wavelet transform
Continuous wavelet transforms
CWT with Adapted wavelet
Demodulation
Estimation
frequency modulated continuous wave (FMCW) radar
Heart rate
maximal ratio combining (MRC)
millimeter wave (mmWave)
Millimeter waves
Monitoring
multiple-input multiple-output (MIMO)
Noise propagation
Obstructions
Radar
Radar antennas
Remote monitoring
Remote vital signs
Signal to noise ratio
Telemedicine
Wavelet transforms
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Summary:Remote non-contact monitoring of human vital signs has recently received lots of attention due to the advancement and availability of millimeter wave (mmWave) radars. These sensors are significantly reduced in size, but still face serious electromagnetic (EM) propagation loss and signal obstructions resulting in lower signal-to-noise ratios (SNR). As mmWave received signals also have higher sensitivity to body motions, these effects typically degrade the accuracy of heart rate (HR) detection. To overcome this challenge, MIMO configuration can be used to improve the SNR level by taking advantage of its channel diversity. We use here a Frequency Modulated Continuous Wave (FMCW) radar from Texas Instruments (TI) at 77 GHz to collect data from 192 channels. Additionally, vital sign information is extracted using Arctangent Demodulation (AD) and Maximal Ratio Combining (MRC) combined with an adapted-wavelet Continuous Wavelet Transform (CWT) are utilized to demonstrate improvement of HR estimation accuracy.
ISSN:2469-7249
2469-7257
DOI:10.1109/JERM.2021.3082807