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Proceedings of the IEEE

Issue 9 • Date Sept. 1982

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Displaying Results 1 - 23 of 23
  • [Front cover and table of contents]

    Publication Year: 1982, Page(s): c1
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  • Scanning the issue

    Publication Year: 1982, Page(s):883 - 884
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  • A historical perspective of spectrum estimation

    Publication Year: 1982, Page(s):885 - 907
    Cited by:  Papers (32)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2695 KB)

    The prehistory of spectral estimation has its roots in ancient times with the development of the calendar and the clock. The work of Pythagoras in 600 B.C. on the laws of musical harmony found mathematical expression in the eighteenth century in terms of the wave equation. The struggle to understand the solution of the wave equation was finally resolved by Jean Baptiste Joseph de Fourier in 1807 w... View full abstract»

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  • Spectral estimation: An overdetermined rational model equation approach

    Publication Year: 1982, Page(s):907 - 939
    Cited by:  Papers (250)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (3252 KB)

    In seeking rational models of time series, the concept of approximating second-order statistical relationships (i.e., the Yule-Walker equations) is often explicitly or implicitly invoked. The parameters of the hypothesized rational model are typically selected so that these relationships "best represent" a set of autocorrelation lag estimates computed from time series observations. One of the obje... View full abstract»

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  • On the rationale of maximum-entropy methods

    Publication Year: 1982, Page(s):939 - 952
    Cited by:  Papers (604)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1610 KB)

    We discuss the relations between maximum-entropy (MAXENT) and other methods of spectral analysis such as the Schuster, Blackman-Tukey, maximum-likelihood, Bayesian, and Autoregressive (AR, ARMA, or ARIMA) models, emphasizing that they are not in conflict, but rather are appropriate in different problems. We conclude that: 1) "Orthodox" sampling theory methods are useful in problems where we have a... View full abstract»

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  • Maximum-entropy spectral analysis of radar clutter

    Publication Year: 1982, Page(s):953 - 962
    Cited by:  Papers (54)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (853 KB)

    The paper reviews a processor that uses the maximum-entropy spectral estimate to provide a set of Doppler-based features for classifying the different forms of radar clutter as encountered in an air traffic control environment. This enables vectoring aircraft around an area that is made hazardous by the presence of major weather disturbances or migrating flocks of birds. An overview is given of ex... View full abstract»

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  • Estimation of structured covariance matrices

    Publication Year: 1982, Page(s):963 - 974
    Cited by:  Papers (194)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1106 KB)

    Covariance matrices from stationary time series are Toeplitz. Multichannel and multidimensional processes have covariance matrices of block Toeplitz form. In these cases and many other situations, one knows that the actual covariance matrix belongs to a particular subclass of covariance matrices. This paper discusses a method for estimating a covariance matrix of specified structure from vector sa... View full abstract»

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  • Estimation of frequencies of multiple sinusoids: Making linear prediction perform like maximum likelihood

    Publication Year: 1982, Page(s):975 - 989
    Cited by:  Papers (528)  |  Patents (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1303 KB)

    The frequency-estimation performance of the forward-backward linear prediction (FBLP) method of Nuttall/Uhych and Clayton, is significantly improved for short data records and low signal-to-noise ratio (SNR) by using information about the rank M of the signal correlation matrix. A source for the improvement is an implied replacement of the usual estimated correlation matrix by a least squares appr... View full abstract»

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  • Lattice methods for spectral estimation

    Publication Year: 1982, Page(s):990 - 1017
    Cited by:  Papers (56)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1808 KB)

    Lattice forms provide convenient parametrization of rational spectra of stationary processes. A comprehensive summary of lattice algorithms for estimating spectral parameters of AR, MA, and ARMA processes is presented. It is shown that various well-known spectral estimation techniques, such as the Maximum Entropy Method (MEM) and Maximum Likelihood Method (MLM), can be efficiently computed from la... View full abstract»

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  • The application of spectral estimation methods to bearing estimation problems

    Publication Year: 1982, Page(s):1018 - 1028
    Cited by:  Papers (243)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1091 KB)

    The equivalence between the problem of determining the bearing of a radiating source with an array of sensors and the problem of estimating the spectrum of a signal is demonstrated. Modern spectral estimation algorithms are derived within the context of array processing using an algebraic approach. Emphasis is placed on the problem of determining the bearing of a sound source with an array. Specia... View full abstract»

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  • Multidimensional spectral estimation

    Publication Year: 1982, Page(s):1029 - 1039
    Cited by:  Papers (79)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1305 KB)

    Methods of multidimensional power spectral estimation are reviewed. Seven types of estimators are discussed: Fourier, separable, data extension, MLM, MEM, AR, and Pisarenko estimators. Particular emphasis is given to MEM where current research is quite active. Theoretical developments are reviewed and computational algorithms are discussed. View full abstract»

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  • Spectral approach to geophysical inversion by Lorentz, Fourier, and Radon transforms

    Publication Year: 1982, Page(s):1039 - 1054
    Cited by:  Papers (18)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1450 KB)

    Geophysical inversion seeks to determine the structure of the interior of the earth from data obtained at the surface. In reflection seismology, the problem is to find inverse methods that give structure, composition, and source parameters by processing the received seismograms. The pioneering work of Jack Cohen and Norman Bleistein on general inverse methods has caused a revolution in the directi... View full abstract»

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  • Spectrum estimation and harmonic analysis

    Publication Year: 1982, Page(s):1055 - 1096
    Cited by:  Papers (1455)  |  Patents (25)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (4195 KB)

    In the choice of an estimator for the spectrum of a stationary time series from a finite sample of the process, the problems of bias control and consistency, or "smoothing," are dominant. In this paper we present a new method based on a "local" eigenexpansion to estimate the spectrum in terms of the solution of an integral equation. Computationally this method is equivalent to using the weishted a... View full abstract»

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  • Robust-resistant spectrum estimation

    Publication Year: 1982, Page(s):1097 - 1115
    Cited by:  Papers (86)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1782 KB)

    Conventional spectrum estimates of both the smoothed-periodogram and autoregressive variety lack robustness toward outliers in the original data. Outliers and other local perturbations are modeled by non-Gaussian additive noise, which is zero most of the time. Correspondingly, the lack of robustness of the conventional estimates of the spectrum manifest not only inflated variances but also damagin... View full abstract»

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  • Spectral estimation using combined time and lag weighting

    Publication Year: 1982, Page(s):1115 - 1125
    Cited by:  Papers (46)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1085 KB)

    This paper presents a five-step method for spectral estimation that combines time and lag weighting and leads to a procedure that requires less than one-half the computations of standard methods. The Blackman-Tukey method and the Weighted Overlapped Segment Averaging (WOSA) method (widely used in sonar and other applications) are shown to be special cases of the combined method. An analysis of the... View full abstract»

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  • The effects of error in the adaptive antenna reference

    Publication Year: 1982, Page(s):1128 - 1129
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (196 KB)

    The reference which designates the Signal of Interest (SOI) in an adaptive antenna system (whether emitter direction or signal recognition) must do so with sufficient accuracy to prevent designation of a portion of the SOI as unwanted. This would result in suppression of the SOI with the same efficacy as a jammer. View full abstract»

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  • On the uniqueness and existence of iterative solutions of certain circuit analysis problems

    Publication Year: 1982, Page(s):1129 - 1130
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (159 KB)

    A few basic facts regarding the analysis of a certain class of circuit problems are discussed. Some bounds on the existence of an iterative solution are presented via contraction mapping. The analysis of a simple differential amplifier is used as an example. View full abstract»

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  • Canonic coupling of sinusoidal oscillators

    Publication Year: 1982, Page(s):1130 - 1132
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The problem of coupling between oscillators is usually tackled by employing the Van der Pol equation for representing the oscillators and solving the equations approximately. The present communication suggests another well-known oscillator and simple coupling factors for modeling the system. As a result, the system equations become directly integrable without approximations. The problem of the cou... View full abstract»

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  • A derivation for the discrete cosine transform

    Publication Year: 1982, Page(s):1132 - 1134
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (351 KB)

    The purpose of this letter is to derive the discrete cosine transform (DCT) as a limiting case of the Karhunen-Loève transform (KLT) of a first-order Markov process, as the correlation coefficient approaches 1. View full abstract»

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  • Invitation to forth

    Publication Year: 1982, Page(s):1134 - 1135
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  • Gasdynamic laser

    Publication Year: 1982, Page(s): 1134
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  • Book alert

    Publication Year: 1982, Page(s):1135 - 1136
    Cited by:  Papers (3)
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  • [Back cover]

    Publication Year: 1982, Page(s): c4
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H. Joel Trussell
North Carolina State University