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Polyphase-Basis Discrete Cosine Transform for Real-Time Measurement of Heart Rate With CW Doppler Radar
- Source :
- IEEE Transactions on Microwave Theory and Techniques. 66:1644-1659
- Publication Year :
- 2018
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2018.
-
Abstract
- This paper presents a novel polyphase-basis discrete cosine transform that can be used for challenges to observe heart rate (HR) variability and sudden changes of HR in short time. To succeed in the challenges, real-time measurement which requires a short window length is needed. As the window length decreases, however, increased main-lobe width (MLW) and sidelobe width (SLW) result errors in measuring HR. Unlike commonly used discrete Fourier transform (DFT), the proposed method is based on DCT, which improves the accuracy of measured HR even though the short window length is used for the real-time measurement of HR. We demonstrate that the DCT can give 2 times shorter MLW and SLW than the DFT can. To verify the proposed method, it is compared with well-known existing methods, arctangent demodulation and complex signal demodulation, which use the DFT. We measured HR using a 10.225-GHz continuous-wave Doppler radar. In each experiment, the window lengths of 3, 2, and 1.5 s were used to measure HR in real time. Experimental results show that the proposed method has lower mean and standard deviation of errors than the existing methods have.
- Subjects :
- Radiation
020208 electrical & electronic engineering
Doppler radar
020206 networking & telecommunications
02 engineering and technology
Condensed Matter Physics
Standard deviation
Discrete Fourier transform
law.invention
Length measurement
law
0202 electrical engineering, electronic engineering, information engineering
Electronic engineering
Discrete cosine transform
Polyphase system
Demodulation
Electrical and Electronic Engineering
Radar
Algorithm
Mathematics
Subjects
Details
- ISSN :
- 15579670 and 00189480
- Volume :
- 66
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Microwave Theory and Techniques
- Accession number :
- edsair.doi...........361b49f032502a03bb99c823d0666b62