Noise Considerations for Remote Detection of Life Signs with Microwave Doppler Radar
Dung Nguyen; Yamada, S.; Byung-Kwon Park; Lubecke, V.; Boric-Lubecke, O.; Host-Madsen, A.
Engineering in Medicine and Biology Society, 2007. EMBS 2007. 29th Annual International Conference of the IEEE
Volume , Issue , 22-26 Aug. 2007 Page(s):1667 - 1670
Digital Object Identifier   10.1109/IEMBS.2007.4352628
Summary:This paper describes and quantifies three main sources of baseband noise affecting physiological signals in a direct conversion microwave Doppler radar for life signs detection. They are thermal noise, residual phase noise, and Flicker noise. In order to increase the SNR of physiological signals at baseband, the noise floor, in which the Flicker noise is the most dominant factor, needs to be minimized. This paper shows that with the consideration of the noise factor in our Doppler radar, Flicker noise canceling techniques may drastically reduce the power requirement for heart rate signal detection by as much as a factor of 100.

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