期刊名称：Signal & Image Processing : An International Journal (SIPIJ)
印刷版ISSN：2229-3922
电子版ISSN：0976-710X
出版年度：2011
卷号：2
期号：1
页码：114
出版社：Academy & Industry Research Collaboration Center (AIRCC)
摘要：This paper presents a method of spectrum estimation using second order group delay functionsderived from the phase of the Fourier Transform (FT). The results obtained from the proposed method arecompared with that of first order group delay function spectral estimation. This method provides betterresolution with reduced variance and also suppresses the spikes generated due to noise in the spectrumcompared to first order group delay functions spectral estimation. The spectral estimation is obtainedusing this method, the resolution properties of the periodogram estimation are preserved while thevariance is reduced. Variance caused by the side lobe leakage due to windows and additive noise issignificantly reduced even in the spectral estimate obtained using a single realization of the observationpeak. This method works even for high noise levels (SNR = 0 dB or less).
关键词：Complex Group Delay; Second Order Group Delay; spectrum estimation; Fourier Transform; Periodogram;Resolution; side lobe leakage
