A new spectral estimator based on discrete cosine transform and modified group delay

Narasimhan, SV and Harish, M (2003) A new spectral estimator based on discrete cosine transform and modified group delay. In: IEEE TENCON 2003. Conference on Convergent Technologies for the Asia-Pacific Region, 15-17 Oct 2003, Bangalore, India.

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Abstract

This paper proposes a new spectral estimator based on discrete cosine transform (DCT) and modified group delay function (MGD) (DCTMGD). The new estimator provides a significant reduction in variance and bias, better signal detection ability and frequency resolution compared with those of based on DFT (DFTMGD). The DCT provides reduced bias and hence enables good signal detection ability. The MGD enables better variance reduction without any loss in frequency resolution. For two sinusoids in noise, it has an improvement in variance of about 63% for SNR= 20 dB and 57% for SNR=0 dB, over those of DFTMGD. For the clean autoregressive (AR) process, the root mean square error (RMSE) reduces by 35% over that of DFTMGD. Further it is able to detect a sinusoid which is about 25 dB below AR spectral peaks

Item Type: Conference or Workshop Item (Paper)
Uncontrolled Keywords: Discrete cosine transforms;Mean square error methods;Signal detection;Signal resolution;Sspectral analysis;Spectral estimator;Discrete cosine transform; Modified group delay function;Signal detection ability;Frequency resolution;Variance reduction;13; autoregressive process13; U2 - root mean square error13; U2 - AR spectral peaks13;
Subjects: ENGINEERING > Electronics and Electrical Engineering
Division/Department: Aerospace Electronics and Controls Division, Aerospace Electronics and Controls Division
Depositing User: MS Jayashree S
Date Deposited: 24 Apr 2007
Last Modified: 24 May 2010 09:55
URI: http://nal-ir.nal.res.in/id/eprint/4162

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