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Fourth Annual ASSP Workshop on Spectrum Estimation and Modeling

3-5 Aug. 1988

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  • Fourth Annual ASSP Workshop on Spectrum Estimation and Modeling (Cat. No.88CH2633-6)

    Publication Year: 1988
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    Freely Available from IEEE
  • Where do we stand on high resolution in low-angle tracking radar?

    Publication Year: 1988
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (56 KB)

    Summary form only given. Various issues involved in the achievement of high resolution in low-angle tracking radar are reviewed. Particular attention is given to the multipath phenomenon, the use of high-resolution beamforming, estimation techniques, nonredundant arrays, results obtained with a multiparameter adaptive radar system, and future plans for adaptive matched illumination and adaptive di... View full abstract»

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  • High-order spectra of mixture processes

    Publication Year: 1988
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (74 KB)

    Summary form only given. In certain processes higher-order spectra reveal more information than second-order spectra. For example, the bispectrum has been applied to determine deviations from Gaussianness, to determine phase information in nonGaussian linear processes, and in nonlinear interactions. The trispectrum has also been used to extract phase information from nonGaussian signals. For the p... View full abstract»

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  • Subspace linear prediction approach to extracting poles

    Publication Year: 1988, Page(s):367 - 370
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (199 KB)

    It is shown that the conventional linear prediction (LP) methods (including various versions of the Prony method) and the matrix pencil method for extracting poles of data sequences can be unified under a generalized approach called the subspace linear prediction (SLP) approach. The conventional LP methods can be considered as high-order SLP methods, while the matrix pencil method is a first-order... View full abstract»

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  • Maximum likelihood estimation of a linearly structured covariance with application to antenna array processing

    Publication Year: 1988, Page(s):172 - 175
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The author considers the maximum-likelihood (ML) estimation of the covariance of a zero-mean Gaussian random vector from its samples, when the covariance has a certain known structure that typically arises in antenna array processing. Owing to this structure, the conventional sample covariance is no longer the ML estimator. While previous approaches to ML estimation of similar structured covarianc... View full abstract»

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  • On the common structure of several well-known methods for harmonic analysis a direction-of-arrival estimation induced by a new version of ESPRIT

    Publication Year: 1988, Page(s):307 - 311
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    It is shown that several recently developed methods for direction-of-arrival estimation by an array of doublets (or for harmonic analysis) are in fact special cases of a more general method. Specifically, it is suggested that ESPRIT (estimation of signal parameters via rotational invariance techniques), the Toeplitz approximation method, Tufts and Kumanesan's (1982, 1983) method, and variants of t... View full abstract»

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  • Structured covariance matrices and dimensionality reduction in array processing

    Publication Year: 1988, Page(s):168 - 171
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    Data are often passed through rectangular matrix transformations in adaptive beamforming and direction-of-arrival estimation to reduce data dimension and lower computational load. The authors show that the transformation defines a structured model for the full dimension data covariance matrix. Signal processing applied to the reduced dimension data is equivalent to processing the original data whi... View full abstract»

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  • Stable data adaptive methods for matched field array processing in acoustic waveguides

    Publication Year: 1988, Page(s):111 - 116
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (472 KB)

    The authors investigate the destabilization of J. Capon's (Proc. IEEE, vol.87, p.1408, 1969) maximum likelihood estimator caused by the presence of correlated noise due to the excitation, by ambient noise sources, of normal mode (or local normal mode) structure in an acoustic waveguide. They develop an estimator-reduced maximum likelihood method that avoids the instability and presents the results... View full abstract»

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  • Robust hyperbolic square root updating in RLS estimation

    Publication Year: 1988, Page(s):301 - 306
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    A stabilized version of the hyperbolic Householder transform method for the multiple vector downdating of Cholesky factors has been developed. This approach offers roughly a twofold savings over schemes based on the multiple application of single-vector downdating schemes, and it is just as stable. The proposed approach is found to exhibit numerical behavior superior to the standard scheme in simu... View full abstract»

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  • High resolution spectral estimation through localized polynomial approximation

    Publication Year: 1988, Page(s):402 - 407
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    Autoregressive-moving-average models are not adequate for most tomographic imaging reconstruction problems. Consequently, the high-resolution capability being sought is lost when these models are used. In this work, a model based on localized polynomial approximation of the spectrum is proposed to solve this class of spectral estimation problems. A method for finding the model parameters is give, ... View full abstract»

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  • Performance analysis of the SVD-based detection criteria for the case of two coherent signals

    Publication Year: 1988, Page(s):141 - 145
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    A novel set of signal detection criteria that are based on the singular values of the forward-backward data matrix is presented. These criteria are Akaike's information-theoretic criterion and the minimum description length criterion. After formulating the problem, the two detection criteria are presented, and then their performance is analyzed. Finally, simulation results that demonstrate the per... View full abstract»

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  • Signal enhancement: a useful signal processing tool

    Publication Year: 1988, Page(s):162 - 167
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    A recently developed signal enhancement algorithm that can significantly improve the performance of many existing signal processing methods is reviewed. In this approach, the data being analyzed are first preprocessed using signal enhancement to clean up the data. This preprocessing operation seeks to modify the data appropriately so that the modified data satisfy known (or hypothesized) signal at... View full abstract»

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  • A new method to estimate the direction of arrival of signals

    Publication Year: 1988, Page(s):108 - 110
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The authors propose a new method for estimating the direction of arrival for cases where the noise is white or colored. The algorithm for estimating the direction of arrival requires only the solution of a polynomial equation whose degree is just equal to the number of signals. The estimate is strongly consistent under minimal moment restrictions. Simulation results for the proposed method are pre... View full abstract»

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  • Frequency estimation by adaptive notch-filtering in cascade/parallel form

    Publication Year: 1988, Page(s):44 - 48
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    A novel algorithm is presented for frequency estimation of sinusoids in noise. A priori knowledge of relations between the sinusoid frequencies (e.g. harmonics) is incorporated into the procedure, resulting in a single parameter estimation. The special ARMA system used-the notch filter-is implemented in cascade/parallel form with independent second-order sections. The update for each section is do... View full abstract»

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  • Transfer function phase estimation using a low variance higher order spectrum

    Publication Year: 1988, Page(s):217 - 222
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    A method is presented for identifying a linear system from observations of the output only. The authors introduce a new one-dimensional spectrum, P(ω), and use it to obtain the underlying linear system. The proposed method incorporates builtin smoothing mechanisms to reduce the variance of the phase. The proposed approach requires fewer computations that the Lii-Rosenblatt approach (1982), a... View full abstract»

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  • Spectral coherence of nonstationary and transient stochastic processes

    Publication Year: 1988, Page(s):387 - 390
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    Addresses the application of spectral estimation techniques to harmonizable processes. The nature of the spectral coherence exhibited by various types of nonstationary and transient processes is described, it is how spectral estimation techniques used for stationary processes can be adapted to produce the computation of spectral coherence. It is demonstrated how spectral coherence may be used as a... View full abstract»

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  • Exploitation of spectral correlation in cyclostationary signals

    Publication Year: 1988, Page(s):1 - 6
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    The concept of coherence is reviewed and the three basic types of coherence-temporal, spectral, and spatial-are described. Common applications of temporal and spatial coherence are briefly discussed, and novel applications of spectral coherence are explained. The link between cyclostationary and spectral coherence is presented. The spectral decomposition of general coherence is briefly reviewed an... View full abstract»

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  • Nonparametric spectral estimation with a computation engine based on VLSI vector signal processors

    Publication Year: 1988, Page(s):293 - 300
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A three-level embodiment hierarchy, encapsulated within a design methodology and tools set, has been developed to provide a unified solution to the problem of implementing low-latency, high-resolution, and high-throughput nonparametric spectral estimation of a selected frequency band. The three-level embodiment hierarchy is composed of: (i) a VLSI 32-bit vector signal processor capable of direct e... View full abstract»

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  • Spectrum estimation via maximum likelihood estimation of Toeplitz constrained covariances

    Publication Year: 1988, Page(s):182 - 185
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    The authors apply the maximum-likelihood (ML) method to the estimation of Toeplitz constrained covariances from Gaussian processes. An iterative expectation-maximization algorithm is used to generate the maximizers, and performance results are shown, demonstrating the superior mean-squared error properties of the ML estimator to conventional covariance estimates View full abstract»

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  • Passive direction-of-arrival and range estimation for near-field sources

    Publication Year: 1988, Page(s):123 - 128
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (448 KB)

    An algorithm for simultaneously estimating the range and bearing of multiple near-field sources is presented. The method is based on the application of signal subspace ideas to the spatial Wigner-Ville distribution approach originally presented by B.R. Breed and T.E. Posch (Proc. ICASSP'84, p.41B.9.1, 1984). The principal advantages of using signal-subspace methods are that the range/direction-of-... View full abstract»

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  • Sliding spectra: a new perspective

    Publication Year: 1988, Page(s):55 - 59
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB)

    The author introduces a simple method that provides an access to a set of sliding power spectra with different characteristics. The method is based on the use of cascading-form realization of the infinite-impulse-response filter. The filter is employed as a time window to the data samples or their lagged products depending on whether the frequency or the power spectrum is of interest. The choice o... View full abstract»

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  • ARMA modeling based on partial AR and MA parameter approximation

    Publication Year: 1988, Page(s):397 - 401
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A transfer-function modeling concept is developed for an unknown casual stable, linear-time invariant system. The approach taken has been to treat the models separately and then to achieve the general autoregressive-moving-average (ARMA) transfer function representation. The AR approach has been obtained from conventional methods of the Yule-Walker formulations and associated Levinson-Durbin algor... View full abstract»

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  • Detection criteria and spatial-frequential smoothings

    Publication Year: 1988, Page(s):135 - 140
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    Three criteria used to detect how many uncorrelated excitations reach a passive array are examined in two cases: narrowband signals and wideband signals. Two of the criteria are the AIC-MDL (Akaike information-theoretic criterion/minimum description length) criteria and the third uses an adapted statistic of the logarithm of the generalized likelihood ratio. These criteria are compared using analy... View full abstract»

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  • Effects of Gaussian perturbations on parameter estimators derived from an estimated signal subspace

    Publication Year: 1988, Page(s):86 - 91
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The authors present theoretical analyses that are appropriate for both high and low signal-to-noise ratio (SNR) of signal subspace or SVD-based signal-processing algorithms. For the low-SNR case, the probability of obtaining an outlier is calculated and is used to determine the threshold SNR at which the variance of parameter estimation errors departs from Cramer-Rao bound behavior. At high-SNR, t... View full abstract»

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  • Lp estimation techniques applied to multiple emitter location

    Publication Year: 1988, Page(s):333 - 338
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The application of Lp-norm-based estimation techniques to beamforming using the MUSIC algorithm is addressed. An expression is developed for direction-of-arrival (DOA) estimates that minimizes a sum of terms to the pth power, where p may assume values other than 2 (least squares). Additionally, an iterative technique is proposed whereby the effects of previo... View full abstract»

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