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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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  • Detection and frequency estimation of narrow-band signals by means of the instantaneous-frequency distribution (IFD)

    Publication Year: 1988, Page(s):71 - 76
    Cited by:  Papers (4)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (440 KB)

    The instantaneous-frequency distribution (IFD) is an amplitude-invariant spectral representation applicable to signals such as speech. The performance of an IFD with time-averaging and squared-amplitude weighting as a narrow-band signal detector and frequency estimator, in comparison to the classical maximum-likelihood detector/estimator, is evaluated experimentally for a single-complex-pole Gauss... View full abstract»

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  • A design methodology for the optimal estimation of the spectral characteristics of non-stationary random signals

    Publication Year: 1988, Page(s):65 - 70
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The authors outline a methodology for the design of estimators for the evolutive (or Wigner-Ville) spectrum of a harmonizable Gaussian random process, which are optimized to a priori specified properties. Such a property might be the minimization of bias in a specified region of the time-frequency plane consistent with a minimum desired resolution in frequency. The design utilizes Karhunen-Loeve t... View full abstract»

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  • An algorithm for estimating the time varying AR parameters of a nonstationary process

    Publication Year: 1988, Page(s):60 - 64
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (180 KB)

    A nonstationary scalar random process represented by an autoregressive (AR) model with rapidly time-varying coefficients is considered. Assuming the observation of this AR process is contaminated by additive white Gaussian noise, the authors estimate the coefficients using the Kalman filtering technique and the solution of the Ricatti equation. Computer simulations have shown favorable results tha... 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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  • Tracking spectral resonances

    Publication Year: 1988, Page(s):49 - 54
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    An adaptive filter approach that tracks the time-varying parameters of the vocal tract and updates the parameters during the glottal closed phase interval can reduce the formant estimation error. The authors describe three adaptive algorithms for estimating time-varying vocal track parameters: weighted recursive least squared (WRLS), WRLS with variable forgetting factor (WRLS-VFF), and weighted le... 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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  • Spectrum and flat spectral line representation: geometric approach

    Publication Year: 1988, Page(s):312 - 317
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A geometric approach to spectrum representation is presented. Spectrum representation is given for both uncorrelated and correlated noise environments. Conventional, high-resolution, and super-resolution spectra are unified. Flat spectra line representation is introduced for linear arrays. Several flat spectra line representations are given for both correlated and uncorrelated noise. The concept o... View full abstract»

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  • Broadband source location using frequency-independent models [spectral estimation]

    Publication Year: 1988, Page(s):13 - 16
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (344 KB)

    The author describes a method for locating multiple broadband sources from the signals received on any array of sensors. The key idea is to compute a frequency-dependent spatial model that represents the evolution of the (spatial) wavenumbers associated with each source inside the whole frequency band of interest. The location function is then obtained from the spatial transfer function of this mo... View full abstract»

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  • Distributed AR spectral estimation

    Publication Year: 1988, Page(s):376 - 378
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    The author studies the problem of combining in an optimal fashion autoregressive (AR) model-based spectral estimates obtained at geographically dispersed sites under the assumptions that the data are Gaussian AR(p), all sites fit the data to a p-order all-pole model where p is a given integer known to all sensors and to the fusion center, and the amount of data collected at each site is l... View full abstract»

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  • Topological approaches to adaptive spectrum modeling

    Publication Year: 1988, Page(s):39 - 43
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The authors present initial investigations into a novel approach for adaptive parametric spectrum modeling that is based on numerical continuation methods derived from homotopy theory, a branch of algebraic topology. This initial investigation focuses on homotopies applied to system identification using the linear finite-impulse-response filter structure, to illustrate the transition from homotopy... 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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  • Large-aperture sparse array antenna systems of moderate bandwidth for multiple emitter location

    Publication Year: 1988, Page(s):7 - 12
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    Spatial-linear-prediction-filter antenna systems of large aperture width (in wavelengths) are described for the superresolution estimation of multiple emitter locations over moderate bandwidths. To accomplish this difficult task with reasonably few degrees-of-freedom from the large aperture, the system employs interferometer/sparse array techniques in conjunction with a shaped-reference beam which... View full abstract»

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  • Towards a systematic presentation of spectrum estimation

    Publication Year: 1988, Page(s):371 - 375
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    It is shown how a general variational approach implies some well-known spectrum estimation methods, and also how it can generate new ones. The starting approach takes into account the unreliability of the initial autocorrelation estimates and extends the variational formulation of J.P. Burg's (1978) thesis. A data-dependent n-dimensional window method and a maximum entropy method for unre... View full abstract»

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  • Adaptive Bayesian spectrum estimation

    Publication Year: 1988, Page(s):33 - 38
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    A method is described for the numerical analysis of nonstationary signals whose spectral distributions vary slowly enough with time for an adaptive method to be used. The data is processed by blocks. The theory describes the signal by an autoregressive series of high order with stochastic coefficients having a Gaussian distribution. The coefficients are considered as state variables and can thus b... 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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  • 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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  • Dominant-mode steered linear prediction for high resolution broadband source location

    Publication Year: 1988, Page(s):28 - 32
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    The authors develop a linear predictive approach for high-resolution broadband-bearing estimation in low signal-to-noise ratio environments. The proposed technique is based on a space-time statistic called the steered covariance matrix (STCM). In broadband settings, the STCM has an advantage over cross-spectral density matrix in that it can be estimated with much greater statistical stability. The... 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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  • Performance analysis of subspace based methods [plane wave direction of arrival estimation]

    Publication Year: 1988, Page(s):92 - 97
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    The authors analyze the performance of two subspace based methods, ESPRIT, and the Toeplitz Approximation Method (TAM), for estimating the direction of arrival (DOA) of plane waves in white noise. In the case of a linear equispaced sensor array, it is shown that ESPRIT, like TAM, can be treated via a state space formulation leading to interesting insights. The state transition matrix estimated by ... 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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  • Cumulant techniques for the estimation and cancellation of intersymbol interference

    Publication Year: 1988, Page(s):204 - 207
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    A discrete-time method is proposed for the estimation and cancellation of intersymbol interference in a digital communication channel. The received signal is first demodulated and sampled and then the fourth-order cumulants of the resulting discrete-time sequence are estimated. The method estimates the channel impulse response from the complex cepstrum of the aforementioned fourth-order cumulants ... View full abstract»

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