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Proceedings Paper

Analysis of non-idealities of low-pass filter in random demodulator
Author(s): Jingchao Zhang; Ning Fu; Wei Yu; Xiyuan Peng
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Paper Abstract

Random Demodulator (RD) is a novel signal acquisition scheme based on compressed sensing (CS). It is able to acquire signals continuous in time and sparse in frequency at a sampling rate far below the Nyquist frequency. In the RD architecture, low-pass filter plays a role of anti-aliasing and is also the main part of the measurement matrix which should be characterized accurately. In this paper, we analyze the impact of the low-pass filter’s non-idealities. If the filter parameters deviate from their ideal values, there will be mismatch between the ideal impulse response used in the measurement matrix and the practical, which will degrade the reconstruction performance. The results show that with the increase of the degree of mismatch, the quality of signal reconstruction, measured by signal to noise ratio (SNR), declines. The results suggest accurate calibration is needed in practical use.

Paper Details

Date Published: 31 January 2013
PDF: 8 pages
Proc. SPIE 8759, Eighth International Symposium on Precision Engineering Measurement and Instrumentation, 87591Q (31 January 2013); doi: 10.1117/12.2015006
Show Author Affiliations
Jingchao Zhang, Harbin Institute of Technology (China)
Ning Fu, Harbin Institute of Technology (China)
Wei Yu, Harbin Institute of Technology (China)
Xiyuan Peng, Harbin Institute of Technology (China)

Published in SPIE Proceedings Vol. 8759:
Eighth International Symposium on Precision Engineering Measurement and Instrumentation
Jie Lin, Editor(s)

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