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2D-spectral estimation based on DCT and modified magnitude group delay

IR@NAL: CSIR-National Aerospace Laboratories, Bangalore

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Title 2D-spectral estimation based on DCT and modified magnitude group delay
 
Creator Sandeep, P
Shreyamsha Kumar, B K
Narasimhan, SV
 
Subject Communications and Radar
 
Description This paper proposes two new 2D-spectral estimation methods. The 2D-modified magnitude group delay (MMGD) is applied to 2D-discrete Fourier transform (2DDFT) for the first and to the analytic 2D-discrete Cosine transform for the second. The analytic 2D-DCT preserves the desirable properties of the DCT (like, improved frequency resolution, leakage and detectability) and is realized by a 2D-discrete cosine transform (2D-DCT) and its Hilbert transform. The 2D-MMGD is an extension from 1D to 2D, and it reduces the variance preserving the original frequency resolution of 2D-DFT or 2D-analytic DCT, depending upon to which is applied. The first and the second methods are referred to as DFT-MMGD and DCT-MMGD, respectively. The proposed methods are applied to 2D sinusoids and 2D AR process, associated with Gaussian white noise. The performance of the DCT-MMGD is found to be superior to that of DFT-MMGD in terms of variance, frequency resolution and detectability. The performance of DFT-MMGD and DCT-MMGD is better than that of 2D-LP method even when the signal to noise ratio is low.
 
Publisher Springer Verlog
 
Date 2011
 
Type Journal Article
PeerReviewed
 
Format application/pdf
 
Identifier http://nal-ir.nal.res.in/11531/1/A13.pdf
Sandeep, P and Shreyamsha Kumar, B K and Narasimhan, SV (2011) 2D-spectral estimation based on DCT and modified magnitude group delay. SIViP .
 
Relation http://nal-ir.nal.res.in/11531/