Comprehensive Vital Sign Detection using a Wrist Wearable Nonlinear Target and a 5.8-GHz ISM Band Intermodulation Radar

William McDonnell; Ashish Mishra; Changzhi Li

doi:10.1109/RWS45077.2020.9049979

Comprehensive Vital Sign Detection using a Wrist Wearable Nonlinear Target and a 5.8-GHz ISM Band Intermodulation Radar

William McDonnell, Ashish Mishra, Changzhi Li

Electrical and Computer Engineering

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

Abstract

Nonlinear components can be used to generate third order intermodulation frequencies. Taking advantage of this phenomenon the movement of a nonlinear target can be monitored and distinguished from background clutter. This paper discusses the use of an intermodulation radar, operating in the 5.8-GHz ISM band, and a passive nonlinear tag, located on the wrist, to monitor human vital signs and more specifically to improve remote monitoring of the heart rate. The non-ideal background clutter rejection of an intermodulation radar allowed for the respiration rate to also be monitored. Since the movement of the chest reflects the two individual tones from the transmitter and not the third order intermodulation frequency, for which the receiver is tuned, the respiratory frequency component has a scaled amplitude in comparison to what is seen with the use of a Doppler radar. This prevents the heart rate from being indistinguishable from the harmonics of the respiration.

Original language	English
Title of host publication	RWW 2020 - 2020 IEEE Radio and Wireless Symposium
Publisher	IEEE Computer Society
Pages	123-126
Number of pages	4
ISBN (Electronic)	9781728111209
DOIs	https://doi.org/10.1109/RWS45077.2020.9049979
State	Published - Jan 2020
Event	2020 IEEE Radio and Wireless Symposium, RWW 2020 - San Antonio, United States Duration: Jan 26 2020 → Jan 29 2020

Publication series

Name	IEEE Radio and Wireless Symposium, RWS
Volume	2020-January
ISSN (Print)	2164-2958
ISSN (Electronic)	2164-2974

Conference

Conference	2020 IEEE Radio and Wireless Symposium, RWW 2020
Country	United States
City	San Antonio
Period	01/26/20 → 01/29/20

Keywords

Intermodulation
clutter rejection
nonlinear target
vital signs
wearable passive tag

Access to Document

10.1109/RWS45077.2020.9049979

Link to publication in Scopus

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McDonnell, W., Mishra, A., & Li, C. (2020). Comprehensive Vital Sign Detection using a Wrist Wearable Nonlinear Target and a 5.8-GHz ISM Band Intermodulation Radar. In RWW 2020 - 2020 IEEE Radio and Wireless Symposium (pp. 123-126). [9049979] (IEEE Radio and Wireless Symposium, RWS; Vol. 2020-January). IEEE Computer Society. https://doi.org/10.1109/RWS45077.2020.9049979

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abstract = "Nonlinear components can be used to generate third order intermodulation frequencies. Taking advantage of this phenomenon the movement of a nonlinear target can be monitored and distinguished from background clutter. This paper discusses the use of an intermodulation radar, operating in the 5.8-GHz ISM band, and a passive nonlinear tag, located on the wrist, to monitor human vital signs and more specifically to improve remote monitoring of the heart rate. The non-ideal background clutter rejection of an intermodulation radar allowed for the respiration rate to also be monitored. Since the movement of the chest reflects the two individual tones from the transmitter and not the third order intermodulation frequency, for which the receiver is tuned, the respiratory frequency component has a scaled amplitude in comparison to what is seen with the use of a Doppler radar. This prevents the heart rate from being indistinguishable from the harmonics of the respiration.",

keywords = "Intermodulation, clutter rejection, nonlinear target, vital signs, wearable passive tag",

author = "William McDonnell and Ashish Mishra and Changzhi Li",

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McDonnell, W, Mishra, A & Li, C 2020, Comprehensive Vital Sign Detection using a Wrist Wearable Nonlinear Target and a 5.8-GHz ISM Band Intermodulation Radar. in RWW 2020 - 2020 IEEE Radio and Wireless Symposium., 9049979, IEEE Radio and Wireless Symposium, RWS, vol. 2020-January, IEEE Computer Society, pp. 123-126, 2020 IEEE Radio and Wireless Symposium, RWW 2020, San Antonio, United States, 01/26/20. https://doi.org/10.1109/RWS45077.2020.9049979

Comprehensive Vital Sign Detection using a Wrist Wearable Nonlinear Target and a 5.8-GHz ISM Band Intermodulation Radar. / McDonnell, William; Mishra, Ashish; Li, Changzhi.

RWW 2020 - 2020 IEEE Radio and Wireless Symposium. IEEE Computer Society, 2020. p. 123-126 9049979 (IEEE Radio and Wireless Symposium, RWS; Vol. 2020-January).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution › peer-review

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