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
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Creator |
Sandeep, P
Shreyamsha Kumar, B K Narasimhan, SV |
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Subject |
Communications and Radar
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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.
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Publisher |
Springer Verlog
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Date |
2011
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Type |
Journal Article
PeerReviewed |
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Format |
application/pdf
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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 . |
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Relation |
http://nal-ir.nal.res.in/11531/
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