NDLI: Instantaneous frequency estimation using level-crossing information

Content Provider	IEEE Xplore Digital Library
Author	Chandrasekhar, S. Sreenivas, T.V.
Copyright Year	2003
Description	Author affiliation: Dept. of Electr. Commun. Eng., Indian Inst. of Sci., Bangalore, India (Chandrasekhar, S.; Sreenivas, T.V.)
Abstract	We discuss the problem of instantaneous frequency (IF) estimation of phase signals using their level-crossing (LC) instant information. We cast the problem to that of interpolating the instantaneous phase (IP), and hence finding the IF, from samples obtained at the level-crossing instants of the phase signal. These are inherently irregularly spaced and the problem essentially reduces to reconstructing a signal from the samples taken at irregularly sampled points for which we propose a 'line plus sum of sines' model. In the presence of noise, the temporal structure of the level-crossings can get distorted. To reduce the effects of noise, we use a short-time Fourier transform (STFT) based enhancement scheme. The performance of the proposed method is studied through Monte-Carlo simulations for a phase signal with composite IF for various SNRs. Different level-crossing based estimates are combined to obtain a new IF estimate. Simulation studies show that the estimates obtained using zero-crossing (ZC) and other very low level values perform better than those obtained with higher level values.
Sponsorship	IEEE Signal Process, Soc
File Size	269822
File Format	PDF
ISBN	0780376633
ISSN	15206149
DOI	10.1109/ICASSP.2003.1201638
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-04-06
Publisher Place	China
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Frequency estimation Frequency modulation Phase estimation Fourier transforms Signal analysis Noise level Noise reduction Signal processing Random processes Time frequency analysis
Content Type	Text
Resource Type	Article

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