Effect of VCO Non-Linearity on Non-Contact Vital Signs Detection in CW and FMCW Radars

Lakhote, Soham and Kumar, Sumit and Banerjee, Gaurab (2022) Effect of VCO Non-Linearity on Non-Contact Vital Signs Detection in CW and FMCW Radars. In: 2nd International Conference on Artificial Intelligence and Signal Processing, AISP 2022, 12-14 February 2022, Vijayawada, pp. 1-6.

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Abstract

Frequency modulated continuous wave (FMCW) radars are being widely used for vital signs detection due to their capability of range determination. Compared to continuous wave (CW) radars, this additional feature of FMCW radars helps in distinguishing between multiple people and targets. In this paper, the impact of voltage controlled oscillator (VCO) non-linearity on vital signs detection is evaluated with detailed mathematical analysis and MATLAB simulations using a transistor-level nonlinearity model. We demonstrate that vital signs detection is indeed possible with a non-linear VCO, when it is used in CW and FMCW radars. This also leads to the conclusion that expensive linear waveform generation techniques are not needed in indoor vital signs monitoring applications. This can substantially reduce the cost of radars-on-chip.

Item Type:	Conference Proceedings
Publisher:	Institute of Electrical and Electronics Engineers Inc.
Additional Information:	The coptright of this article belongs to the Institute of Electrical and Electronics Engineers Inc.
Keywords:	Arctangent Demodulation; FMCW Radar; Range FFT; VCO; Vital Signs
Department/Centre:	Division of Electrical Sciences > Electrical Communication Engineering
Date Deposited:	23 May 2022 04:49
Last Modified:	23 May 2022 04:49
URI:	https://eprints.iisc.ac.in/id/eprint/72387

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