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Title: Finer Granularity DFT Bins with Moving Window for Capacitance Sensing
Authors: Tyagi T.
Sumathi, Parasuraman
Published in: IEEE Transactions on Industrial Informatics
Abstract: In this article, the moving window discrete Fourier transform (MWDFT) with finer granularity bin indices is proposed for frequency estimation of periodic signals. The MWDFT structure is a cascade connection of comb filter and a complex resonator. The sign of comb filter is toggled between positive and negative using a multiplexer to select the integer and fractional bin indices. The sign of comb filter is chosen as negative for setting-up integer bin indices with certain resonator angle. The positive sign of comb filter rotates the zeros of the MWDFT to a specified angle in the anticlockwise direction in the z-plane. By selecting the positive feed forward coefficient, all odd harmonics of one-half of the fundamental frequency can be extracted from the MWDFT. This unique property of MWDFT with finer granularity bin indices is exploited to extract frequencies of finer resolution. A frequency locked loop is designed with MWDFT of finer granularity bins to estimate the frequency change of finer resolution. The proposed method is implemented on field programmable gate array (FPGA) as a capacitance measurement system. The method is able to provide better accuracy, wider frequency estimation range, and wider capacitance measurement range. © 2005-2012 IEEE.
Citation: IEEE Transactions on Industrial Informatics, 17(1): 504-513
Issue Date: 2021
Publisher: IEEE Computer Society
Keywords: Capacitance measurement
finer granularity bins
fractional bin-index
frequency-locked loop (FLL)
moving window discrete Fourier transform (MWDFT)
ISSN: 15513203
Author Scopus IDs: 57203750512
Author Affiliations: Tyagi, T., Digital Signal Processing (DSP) Centre of Excellence, Bangor University, Bangor, United Kingdom
Parasuraman, S., Department of Electrical Engineering, Indian Institute of Technology Roorkee, Roorkee, Uttarakhand, India
Corresponding Author: Parasuraman, S.; Department of Electrical Engineering, India; email:
Appears in Collections:Journal Publications [EE]

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