Frequency-tuning technique for remote detection of heartbeat and respiration using low-power double-sideband transmission in the ka-band

A Ka-band transceiver using low-power double-sideband transmission to detect human heartbeat and respiration signals is demonstrated. The Ka-band electromagnetic wave offers higher detection sensitivity on small movement due to its shorter wavelength. Indirect-conversion receiver architecture is cho...

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Bibliographic Details
Published in:IEEE transactions on microwave theory and techniques 2006-05, Vol.54 (5), p.2023-2032
Main Authors: Yanming Xiao, Lin, J., Boric-Lubecke, O., Lubecke, M.
Format: Article
Language:English
Subjects:
Applied sciences
Architecture
Biomedical monitoring
cardiopulmonary detection
Circuit properties
continuous-wave (CW) radar
Degradation
Direct current
Doppler radar
double sideband
Electric, optical and optoelectronic circuits
electromagnetic (EM) wave
Electromagnetic scattering
Electromagnetic waves
Electronics
Exact sciences and technology
Frequency
Heart beat
heartbeat
Humans
indirect-conversion receiver
low power
Microwave circuits, microwave integrated circuits, microwave transmission lines, submillimeter wave circuits
Noise reduction
Radar detection
radio frequency (RF)
Radiocommunications
Radiolocalization and radionavigation
remote monitoring
Respiration
sensors
Separation
Sidebands
Signal to noise ratio
Telecommunications
Telecommunications and information theory
Transceivers
Transmitters
Transmitters. Receivers
Wavelengths
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Description
Summary:A Ka-band transceiver using low-power double-sideband transmission to detect human heartbeat and respiration signals is demonstrated. The Ka-band electromagnetic wave offers higher detection sensitivity on small movement due to its shorter wavelength. Indirect-conversion receiver architecture is chosen to reduce the dc offset and 1/f noise that can degrade the signal-to-noise ratio and detection accuracy. Furthermore, the double-sideband signals at the transmitter output can be in quadrature by choosing a proper frequency separation to relieve the severe null point problem that occurs at high frequency. As a result,the detection accuracy is significantly improved with low transmitted power. This radar sensor system achieves better than 80% detection accuracy at a distance of 2.0 m with a combined transmitted power of only 12.5 /spl mu/W in both sidebands.
ISSN:0018-9480
1557-9670
DOI:10.1109/TMTT.2006.873625