Packet radar spectrum recovery for physiological signals

Abstract

Packet Doppler radar is investigated for extracting physiological signals. System on Chip is employed as a signal source in packet mode, and it transmits signals intermittently at 2.405 GHz to save power. Reflected signals are demodulated directly by spectral analysis of received pulses in the baseband. Spectral subtraction, using data from an empty room, is applied to extract the periodic movement. It was experimentally demonstrated that frequency of the periodic motion can be accurately extracted using this technique. Proposed approach reduces the computation complexity of the signal processing part effectively.

Doppler Radar-Based Non-Contact Health Monitoring for Obstructive Sleep Apnea Diagnosis: A Comprehensive Review

“…Frequency-domain analysis applying FFT or alternative Chirp Z-Transform (CZT) [33] with or without Fourier Spectral Subtraction (FSS) [82], have been proposed to identify the highest peak on the frequency-domain at a specific bandwidth targeting respiratory or heart rate. The highest peak at the frequency detected correlates to the rate of the targeted physiological measurement such as respiratory or heart rates.…”