Complex signal demodulation and random body movement cancellation techniques for non-contact vital sign detection

Changzhi Li, Jenshan Lin

Research output: Chapter in Book/Report/Conference proceedingConference contribution

106 Scopus citations

Abstract

A complex signal demodulation technique is proposed to eliminate the null detection point problem in noncontact vital sign detection. This technique is robust against DC offset in direct conversion system. Based on the complex signal demodulation, a random body movement cancellation technique is developed to cancel out strong noise caused by random body movement in non-contact vital sign monitoring. Multiple transceivers and antennas with polarization and frequency multiplexing are used to detect signals from different body orientations. The noise due to random body movement is cancelled out based on different patterns of the desired and undesired signals. Experiments by highly compact 5-6 GHz portable radar systems have been performed to verify these two techniques.

Original languageEnglish
Title of host publication2008 IEEE MTT-S International Microwave Symposium Digest, MTT
Pages567-570
Number of pages4
DOIs
StatePublished - Dec 12 2008
Event2008 IEEE MTT-S International Microwave Symposium Digest, MTT - Atlanta, GA, United States
Duration: Jun 15 2008Jun 20 2008

Publication series

NameIEEE MTT-S International Microwave Symposium Digest
ISSN (Print)0149-645X

Conference

Conference2008 IEEE MTT-S International Microwave Symposium Digest, MTT
CountryUnited States
CityAtlanta, GA
Period06/15/0806/20/08

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Keywords

  • Cardiopulmonary
  • Complex signal
  • Doppler radar sensor
  • Non-contact
  • Polarization multiplexing
  • Random body movement
  • Respiration
  • Vital sign
  • Wireless

Cite this

Li, C., & Lin, J. (2008). Complex signal demodulation and random body movement cancellation techniques for non-contact vital sign detection. In 2008 IEEE MTT-S International Microwave Symposium Digest, MTT (pp. 567-570). [4633229] (IEEE MTT-S International Microwave Symposium Digest). https://doi.org/10.1109/MWSYM.2008.4633229