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Related Experiment Video

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A Novel Digital Platform for a Monitored Home-based Cardiac Rehabilitation Program
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Chest-Worn Health Monitor Based on a Bistatic Self-Injection-Locked Radar.

Fu-Kang Wang, You-Rung Chou, Yen-Chen Chiu

    IEEE Transactions on Bio-Medical Engineering
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    Summary

    This study introduces a low-power wearable health monitor using continuous-wave Doppler radar. The device accurately tracks cardiopulmonary activity and body exercise, integrating multiple sensing functions onto a single radar platform.

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    Area of Science:

    • Biomedical Engineering
    • Wearable Technology
    • Radar Systems

    Background:

    • Continuous-wave Doppler radar offers potential for non-invasive health monitoring.
    • Existing wearable sensors often lack integration and have high power consumption.
    • Wireless transmission of physiological data is crucial for remote patient care.

    Purpose of the Study:

    • To develop a low-power, low-complexity wearable health monitor using continuous-wave Doppler radar technology.
    • To enable simultaneous wireless transmission of Doppler information for cardiopulmonary activity and body exercise monitoring.
    • To demonstrate the integration of sensing and wireless transmission on a single radar platform.

    Main Methods:

    • A bistatic radar architecture was designed, featuring a self-injection-locked oscillator (SILO) tag and an injection-locked oscillator (ILO)-based frequency demodulator.
    • The SILO tag, attached to the chest, converts cardiopulmonary and exercise movements into a frequency-modulated wave.
    • Experiments were conducted using a prototype operating in the 2.36 to 2.484 GHz ISM band, with the demodulator positioned 30 cm from the subject.

    Main Results:

    • The SILO tag demonstrated very low power consumption (4.4 mW).
    • The ILO demodulator successfully processed the transmitted wave to extract chest movement waveforms.
    • Digital signal processing yielded time-frequency spectrograms of cardiopulmonary activity and body exercise.

    Conclusions:

    • The proposed wearable health monitor effectively utilizes continuous-wave Doppler radar for non-invasive physiological monitoring.
    • The system exhibits high potential for integrating cardiopulmonary sensing, pedometry, and wireless transmission.
    • This integrated radar platform offers a promising solution for advanced wearable health monitoring.