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IEEE Transactions on Signal Processing

Issue 6 • Jun 1996

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Displaying Results 1 - 25 of 31
  • An algorithm for multisource beamforming and multitarget tracking

    Publication Year: 1996, Page(s):1512 - 1522
    Cited by:  Papers (36)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1012 KB)

    A new algorithm for simultaneous robust multisource beamforming and adaptive multitarget tracking is proposed. Self-robustness to locations errors or variations is introduced by a source-subspace-based tracking procedure of steering vectors in the array manifold. This LMS-type procedure is generalized from a former work we developed in the single source case. Two beamforming structures are actuall... View full abstract»

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  • A simple estimator for frequency and decay rate

    Publication Year: 1996, Page(s):1504 - 1511
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    A simple, computationally inexpensive algorithm is developed for estimating the frequency and decay rate of a complex exponential. Two iterations of the algorithm attains the Cramer-Rao bound on the variance of the frequency and decay rate estimate for a complex exponential in white Gaussian noise. The algorithm uses an adaptive window that changes its shape with the estimate of the decay rate. Fo... View full abstract»

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  • Recursive median filters of increasing order: a variational approach

    Publication Year: 1996, Page(s):1346 - 1354
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    For a certain class of signals, it is known that the recursive median filters provide a minimum of a related regularizing functional, defined by means of the l1 norm. We generalize such results, and we show that a good approximation to the minima of such a functional can be obtained, for any signal, by means of successive applications of recursive median filters of increasing order View full abstract»

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  • On-line subspace estimation using a Schur-type method

    Publication Year: 1996, Page(s):1585 - 1589
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    A recently developed Schur-type matrix approximation technique is applied to subspace estimation. The method is applicable if an upper bound of the noise level is approximately known. The main feature of the algorithm is that updating and downdating is straightforward and efficient and that the subspace dimension is elegantly tracked as well View full abstract»

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  • Fast estimation of the parameters of alpha-stable impulsive interference

    Publication Year: 1996, Page(s):1492 - 1503
    Cited by:  Papers (86)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1104 KB)

    We address the problem of estimation of the parameters of the recently proposed symmetric, alpha-stable model for impulsive interference. We propose new estimators based on asymptotic extreme value theory, order statistics, and fractional lower order moments, which can be computed fast and are, therefore, suitable for the design of real-time signal processing algorithms. The performance of the new... View full abstract»

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  • Transfer function identification with filtering techniques

    Publication Year: 1996, Page(s):1334 - 1345
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    This paper addresses the problem of identifying the transfer function of a plant with the aid of filtering techniques. Conditions for obtaining fair estimates of a transfer function are derived. It is shown that, to be able to reduce the effect of noise and other stochastic effects, highly tuned filters are required. It is also found that proper excitation signals are necessary for effective imple... View full abstract»

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  • Decorrelation performance of DEESE and spatial smoothing techniques for direction-of-arrival problems

    Publication Year: 1996, Page(s):1579 - 1584
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    Second-order spatial analysis methods for array signal processing have been shown to yield high resolution by exploiting specific eigenstructure properties of the array output covariance matrix. However, when some of the signals are coherent, these covariance-based methods face serious difficulties produced by smaller rank. In this correspondence, a theoretical expression is derived for the effect... View full abstract»

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  • FIR system identification based on subspaces of a higher order cumulant matrix

    Publication Year: 1996, Page(s):1485 - 1491
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (612 KB)

    A new linear algebraic approach for identification of a nonminimum phase FIR system of known order using only higher order (>2) cumulants of the output process is proposed. It is first shown that a matrix formed from a set of cumulants of arbitrary order can be expressed as a product of structured matrices. The subspaces of this matrix are then used to obtain the parameters of the FIR system us... View full abstract»

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  • Some properties of generalized factorable 2-D FIR filters

    Publication Year: 1996, Page(s):1534 - 1546
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1184 KB)

    Factorable M-dimensional filters are interesting because they can be implemented efficiently: their computational complexity is O(Mn) instead of O(nM) (as in the case of generic non-factorable filters). Unfortunately, the passband support of a factorable filter can assume only very simple shapes (parallelepipeds with edges pairwise parallel to the axes), which are not adequate for most ... View full abstract»

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  • Design of IIR digital filters based on eigenvalue problem

    Publication Year: 1996, Page(s):1325 - 1333
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (708 KB)

    This paper presents a new method for designing IIR digital filters with optimum magnitude response in the Chebyshev sense and different order numerator and denominator. The proposed procedure is based on the formulation of a generalized eigenvalue problem by using Remez exchange algorithm. Since there exist more than one eigenvalue in the general eigenvalue problem, we introduce a very simple sele... View full abstract»

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  • Adaptive rank estimation for spherical subspace trackers

    Publication Year: 1996, Page(s):1573 - 1579
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (584 KB)

    We develop a rank tracking method for spherical subspace trackers. The method adaptively sets a threshold based on the averaged noise eigenvalue. The signal eigenvalues are then compared with the threshold to reach a decision on the subspace rank. The threshold itself is chosen to balance the error probabilities due to rank underfitting and overfitting. Simulation results show that our method perf... View full abstract»

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  • Analytical optimization of CQF filter banks

    Publication Year: 1996, Page(s):1564 - 1568
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    The optimization of subband filter banks for signal and image coding is normally dealt with by numerical means. It is shown that this optimization can be done analytically in the case of the prototype four-tap causal conjugate quadrature filter (CQF). The coding gain and aliasing energy are considered in the optimization. Using parametrizations of the prototype filter coefficients, it was found th... View full abstract»

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  • An adaptive filtering approach to spectral estimation and SAR imaging

    Publication Year: 1996, Page(s):1469 - 1484
    Cited by:  Papers (220)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2184 KB)

    We present an adaptive FIR filtering approach, which is referred to as the amplitude and phase estimation of a sinusoid (APES), for complex spectral estimation. We compare the APES algorithm with other FIR filtering approaches including the Welch (1967) and Capon (1969) methods. We also describe how to apply the FIR filtering approaches to target range signature estimation and synthetic aperture r... View full abstract»

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  • Alignment blur in coherently averaged images

    Publication Year: 1996, Page(s):1596 - 1601
    Cited by:  Papers (1)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2164 KB)

    Blurring of coherently averaged images due to imperfect alignment is studied, and two restoration methods are proposed and evaluated. It is shown that iterative realignment is more powerful than post-filtering in reducing blur. The value of averaging and restoration is illustrated on human subjects in noisy video sequences View full abstract»

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  • Weighted least-squares design of recursive allpass filters

    Publication Year: 1996, Page(s):1553 - 1557
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (396 KB)

    A method for the design of allpass filters is described. In this method, an error reflecting the difference between the desired phase response and the phase response of the practical allpass filter is formulated in a quadratic form. The coefficients are obtained by solving a system of linear equations involving the sum of a Toeplitz and an Hankel matrix View full abstract»

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  • A group theoretic approach to multidimensional filter banks: theory and applications

    Publication Year: 1996, Page(s):1392 - 1405
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1316 KB)

    In this paper, we provide a new method for analyzing multidimensional filter banks. This method enables us to solve various open problems in multidimensional filter bank characterization and design. The essential element in this new approach is the redefinition of polyphase components. It will be shown that a rich set of mathematical tools, in particular algebraic group theory, will become availab... View full abstract»

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  • Piecewise linear system modeling based on a continuous threshold decomposition

    Publication Year: 1996, Page(s):1440 - 1453
    Cited by:  Papers (17)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1436 KB)

    The continuous threshold decomposition is a segmentation operator used to split a signal into a set of multilevel components. This decomposition method can be used to represent continuous multivariate piecewise linear (PWL) functions and, therefore, can be employed to describe PWL systems defined over a rectangular lattice. The resulting filters are canonical and have a multichannel structure that... View full abstract»

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  • Invariant tests for spatial stationarity using covariance structure

    Publication Year: 1996, Page(s):1523 - 1533
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (872 KB)

    We propose new tests for validating the ULA model based on the received array data. These tests use the structure of the covariance matrix of the data to decide whether the received data is spatially stationary. Invariance principles are used to ensure that the test has constant significance (equivalent to a CFAR test) when the model is indeed true by eliminating the dependence on the covariance. ... View full abstract»

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  • On alias-free formulations of discrete-time Cohen's class of distributions

    Publication Year: 1996, Page(s):1355 - 1364
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1020 KB)

    The transition of the Cohen's (1989) class of distributions from the continuous-time case to the discrete-time case is not straightforward because of aliasing problems. We classify the aliasing problems, which occur for joint time-frequency representations (TFRs), into two categories: type-I and type-II aliasings. Type-I aliasing can be avoided by properly defined discrete-time versions of some me... View full abstract»

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  • Robust adaptive beamforming via target tracking

    Publication Year: 1996, Page(s):1589 - 1593
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The proposed robust beamformer adaptively self-corrects and tracks desired-source location errors or variations regardless of the eigenstructure of the input correlation matrix, of the array shape and nature of the noise. It only requires an order of computations of the sensors number and performs nearly as well as MUSIC in localization View full abstract»

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  • Constrained regularized image restoration using projection on a set of regularized solutions

    Publication Year: 1996, Page(s):1547 - 1548
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB)

    This article addresses a problem of constrained regularized image restoration. A consistent approach to the solution of this problem is based on minimizing the Tikhonov's (1977) regularizing functional subject to a set of constraints. It is demonstrated that a set of regularized solutions resulting from minimization of Tikhonov's functional is closed and convex and a projection operator on this se... View full abstract»

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  • Self-similar set identification in the time-scale domain

    Publication Year: 1996, Page(s):1568 - 1573
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (524 KB)

    We study the wavelet transform of deterministic self-similar signals and derive their properties, as well as a new algorithm for identification of the self-similarity parameter. We also include such applications as characterization and analysis of real chaotic signals in the presence of additive noise View full abstract»

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  • Auto-term representation by the reduced interference distributions: a procedure for kernel design

    Publication Year: 1996, Page(s):1557 - 1563
    Cited by:  Papers (58)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (632 KB)

    An analysis of auto-term presentation using the reduced interference distributions (RID) is done. Comparison with an ideal time-frequency signal representation is taken as a basis for this analysis. The following distributions are considered: Choi-Williams (1989), Zao-Atlas-Marks, Born-Jordan, sinc, Zhang-Sato (see ibid., vol.42, no.1, p.54, 1994), Butterworth, spectrogram, and the author's recent... View full abstract»

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  • Optimal biorthogonal wavelet bases for signal decomposition

    Publication Year: 1996, Page(s):1406 - 1417
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (828 KB)

    The selection of scaling functions for optimal signal representation by general multidimensional biorthogonal wavelet bases is investigated. Criterion for optimality is the minimization of the mean-square approximation error at each level of the decomposition. Conditions are given under which the approximation error of the decomposition approaches zero as the level increases. Given arbitrary synth... View full abstract»

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  • Recursive filtering with non-Gaussian noises

    Publication Year: 1996, Page(s):1454 - 1468
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1196 KB)

    The Kalman filter is an optimal recursive filter, although its optimality can only be claimed under the Gaussian noise environment. In this paper, we consider the problem of recursive filtering with non-Gaussian noises. One of the most promising schemes, which was proposed by Masreliez (1972, 1975), uses the nonlinear score function as the correction term in the state estimate. Unfortunately, the ... View full abstract»

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Aims & Scope

IEEE Transactions on Signal Processing covers novel theory, algorithms, performance analyses and applications of techniques for the processing, understanding, learning, retrieval, mining, and extraction of information from signals

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Meet Our Editors

Editor-in-Chief
Sergios Theodoridis
University of Athens