DC information preservation for cardiopulmonary monitor utilizing CW doppler radar

Author

Vergara, Alexander M. ; Boric-Lubecke, Olga ; Lubecke, Victor M.

Author_Institution

University of Hawai´´i at Manoa, USA

fYear

2008

fDate

20-25 Aug. 2008

Firstpage

1246

Lastpage

1249

Abstract

Direct conversion RF receivers introduce large DC offsets, reducing the dynamic range of the baseband signal. Coupled with the relatively small time varying signals in human vital sign monitoring using CW Doppler radar, extraction of cardio-pulmonary information becomes difficult. Previous DC offset compensation techniques utilizing AC coupling have proven detrimental to the performance of the system and the integrity of the low-frequency cardiopulmonary signals. A proposed system utilizing digitally controlled voltage feedback and center finding preserves the important DC information for optimal extraction of phase information in the quadrature system.

Keywords

Baseband; Cardiology; Data mining; Doppler radar; Dynamic range; Humans; Monitoring; Optimal control; RF signals; Radio frequency; Cardiovascular System; Computer-Aided Design; Doppler Effect; Equipment Design; Humans; Microwaves; Monitoring, Physiologic; Radar; Respiratory System; Signal Processing, Computer-Assisted;

fLanguage

English

Publisher

ieee

Conference_Titel

Engineering in Medicine and Biology Society, 2008. EMBS 2008. 30th Annual International Conference of the IEEE

Conference_Location

Vancouver, BC

ISSN

1557-170X

Print_ISBN

978-1-4244-1814-5

Electronic_ISBN

1557-170X

Type

conf

DOI

10.1109/IEMBS.2008.4649389

Filename

4649389