Key result
Continuous-wave Doppler radar and signal demodulation techniques offer a promising approach for noncontact vital sign monitoring by addressing challenges like null-point issues and nonlinear distortion.
Why the study?
Noncontact vital sign monitoring with Doppler radar faces challenges like null-point issues, dc offset, and nonlinear distortion, requiring specific demodulation and signal processing methods.
This review summarizes signal demodulation and processing techniques for continuous-wave Doppler radar to enable accurate noncontact monitoring of respiration and heart rates.
Answers are grounded in this paper and cite their sources.
Noncontact radar monitoring merits investigation but should not change practice yet; leaves open validation in clinical cohorts.
Using a Doppler radar for noncontact detection is a promising way to monitor vital signs of a subject more conveniently than other common contact medical devices, but has many challenges including null-point issue, dc offset, and nonlinear distortion. The wireless property of a radar system easily affects the Doppler signals, so it needs a demodulation method to obtain the vital sign information. Furthermore, detecting precise information for respiration rate (RR) and heart rate (HR) of the subject needs further signal processing to extract the target signals from the demodulated signals at various interference levels. Hence, this study reviews research on continuous-wave (CW) Doppler radar, signal demodulation and subsequent signal processing to address the problems for noncontact vital sign monitoring.
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Wang et al. (2022) conducted a review in Noncontact vital sign monitoring. Continuous-wave (CW) Doppler radar was evaluated. Continuous-wave Doppler radar and signal demodulation techniques offer a promising approach for noncontact vital sign monitoring by addressing challenges like null-point issues and nonlinear distortion.
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