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IEEE Transactions on Signal Processing

Issue 12 • Dec. 2000

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Displaying Results 1 - 25 of 40
  • Comments on "Resolution in time-frequency"

    Publication Year: 2000, Page(s):3585 - 3586
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (59 KB)

    The author comments that the first line of conjecture 5 in the paper of DeBrunner, Ozaydin and Przebinda (see ibid., vol.47, p.783-88, 1999) was proven by Dembo et al. (1991). The proof is a consequence of the properties of the discrete Renyi entropies. Conjecture 5 is a special case of the Renyi-Hirschman inequality. View full abstract»

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  • List of reviewers

    Publication Year: 2000, Page(s):3595 - 3599
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    Freely Available from IEEE
  • Information for authors

    Publication Year: 2000, Page(s):3600 - 3601
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    Freely Available from IEEE
  • Author index

    Publication Year: 2000, Page(s):3602 - 3612
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    Freely Available from IEEE
  • Subject index

    Publication Year: 2000, Page(s):3612 - 3649
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    Freely Available from IEEE
  • A framework for multiscale and hybrid RKHS-based approximators

    Publication Year: 2000, Page(s):3559 - 3568
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    A generalized framework for deriving multiscale and hybrid functionally expanded approximators that are linear in the adjustable weights is presented. The basic idea here is to define one or more appropriate function spaces and then to impose a geometric structure on these to obtain reproducing kernel Hilbert spaces (RKHSs). The weight identification problem is formulated as a minimum norm optimiz... View full abstract»

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  • Design and multiplier-less implementation of a class of two-channel PR FIR filterbanks and wavelets with low system delay

    Publication Year: 2000, Page(s):3379 - 3394
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    A new method for designing two-channel PR FIR filterbanks with low system delay is proposed. It is based on the generalization of the structure previously proposed by Phoong et al. (1995) Such structurally PR filterbanks are parameterized by two functions (β(z) and α(z)) that can be chosen as linear-phase FIR or allpass functions to construct FIR/IIR filterbanks with good frequency char... View full abstract»

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  • Efficient, high performance, subspace tracking for time-domain data

    Publication Year: 2000, Page(s):3307 - 3315
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    This paper describes two new algorithms for tracking the subspace spanned by the principal eigenvectors of the correlation matrix associated with time-domain (i.e., time series) data. The algorithms track the d principal N-dimensional eigenvectors of the data covariance matrix with a complexity of O(Nd2), yet they have performance comparable with algorithms having O(N2d) comp... View full abstract»

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  • Finite sample criteria for autoregressive order selection

    Publication Year: 2000, Page(s):3550 - 3558
    Cited by:  Papers (70)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB)

    The quality of selected AR models depends on the true process in the finite sample practice, on the number of observations, on the estimation algorithm, and on the order selection criterion. Samples are considered to be finite if the maximum candidate model order for selection is greater than N/10, where N denotes the number of observations. Finite sample formulae give empirical approximations for... View full abstract»

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  • A good read

    Publication Year: 2000, Page(s): 3265
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (12 KB)

    First Page of the Article
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  • A tiling of phase-space through self-convolution

    Publication Year: 2000, Page(s):3581 - 3585
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB)

    A novel tiling for Fourier half space is constructed using Erlang functions. This tiling is constructed by shifts in discrete-time and self-convolutions in the Fourier domain. We show that a subframe of this complex wavelet family can be used for the detection and characterization of events (step and peaks) in one-dimensional (1-D) discrete-time signals. View full abstract»

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  • On the estimation of interleaved pulse train phases

    Publication Year: 2000, Page(s):3420 - 3425
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    Some signals are transmitted as periodic pulse trains where information is in the timing of the arrival of the pulses. A number of pulse trains arriving over the same time interval are said to be interleaved. We propose an on-line method for estimating pulse train phases and fine-tuning pulse repetition frequency (PRF) estimates of a known number of interleaved pulse trains. The computational effo... View full abstract»

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  • Generalized unequal length lapped orthogonal transform for subband image coding

    Publication Year: 2000, Page(s):3365 - 3378
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (912 KB)

    Generalized linear phase lapped orthogonal transforms with unequal length basis functions (GULLOTs) are considered. The length of each basis of the proposed GULLOT can be different from each other, whereas all the bases of the conventional GenLOT are of equal length. In general, for image coding application, the long basis for a low-frequency band and the short basis for a high-frequency one are d... View full abstract»

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  • Maximum likelihood estimation of K-distribution parameters via the expectation-maximization algorithm

    Publication Year: 2000, Page(s):3303 - 3306
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    Maximum likelihood (ML) estimates of K-distribution parameters are derived using the expectation maximization (EM) approach. This approach demonstrates the computational advantages compared with 2-D numerical maximization of the likelihood function using a Nelder-Mead approach. For large datasets, the EM approach yields more accurate estimates than those of a non-ML estimation technique. View full abstract»

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  • Blind equalization in SIMO OFDM systems with frequency domain spreading

    Publication Year: 2000, Page(s):3536 - 3549
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (412 KB)

    The problem of bandwidth efficient data transmission in multiple antenna orthogonal frequency division multiplex (OFDM) systems is considered. Contrary to the mono-sensor systems, the effects of frequency-selective fading may be compensated in the multiple antenna systems due to the space diversity without using a wireless overhead. A modulation scheme that improves the reliability of data transmi... View full abstract»

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  • Thresholding implied by truncated quadratic regularization

    Publication Year: 2000, Page(s):3437 - 3450
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (508 KB)

    We address the problem of the estimation of an unknown signal that is known to involve sharp edges, from noisy data given at the output of a linear system. The sought solution is defined to be the global minimizer of an objective function combining a quadratic data-fidelity term and a regularization term. The latter term is a sum whose entries are obtained by applying a truncated quadratic potenti... View full abstract»

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  • Second-order Volterra system identification

    Publication Year: 2000, Page(s):3574 - 3577
    Cited by:  Papers (17)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    Second-order Volterra system identification is discussed. Crosscumulant information is converted into a Fredholm integral equation. Special emphasis is focused on inputs obtained at the output of a linear filter driven by higher order white noise. View full abstract»

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  • The integer transforms analogous to discrete trigonometric transforms

    Publication Year: 2000, Page(s):3345 - 3364
    Cited by:  Papers (13)  |  Patents (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The integer transform (such as the Walsh transform) is the discrete transform that all the entries of the transform matrix are integer. It is much easier to implement because the real number multiplication operations can be avoided, but the performance is usually worse. On the other hand, the noninteger transform, such as the DFT and DCT, has a good performance, but real number multiplication is r... View full abstract»

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  • Asymptotic smoothing errors for hidden Markov models

    Publication Year: 2000, Page(s):3289 - 3302
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (428 KB)

    In this paper, the asymptotic smoothing error for hidden Markov models (HMMs) is investigated using hypothesis testing ideas. A family of HMMs is studied parametrised by a positive constant ε, which is a measure of the frequency of change. Thus, when ε→0, the HMM becomes increasingly slower moving. We show that the smoothing error is O(ε). These theoretical predictions are conf... View full abstract»

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  • Scalability of 2-D wavelet transform algorithms: analytical and experimental results on MPPs

    Publication Year: 2000, Page(s):3407 - 3419
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    This paper studies the scalability of two-dimensional (2-D) discrete wavelet transform (DWT) algorithms on massively parallel processors (MPPs). The principal operation in the 2-D DWT is the filtering operation used to implement the filter banks of the 2-D subband decomposition. This filtering operation can be implemented as a convolution in the time domain or as a multiplication in the frequency ... View full abstract»

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  • Multitaper spectrum estimation for time series with gaps

    Publication Year: 2000, Page(s):3472 - 3483
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    Gaps in time series can produce spurious features in power spectrum estimates. These artifacts can be suppressed by averaging spectrum estimates obtained by first windowing the time series with a collection of orthogonal tapers. Such "multitaper" methods have been used for data without gaps since the early 1980s and for more general sampling schemes since the late 1980s. We introduce three familie... View full abstract»

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  • Maximum-likelihood array processing in non-Gaussian noise with Gaussian mixtures

    Publication Year: 2000, Page(s):3520 - 3535
    Cited by:  Papers (69)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    Many approaches have been studied for the array processing problem when the additive noise is modeled with a Gaussian distribution, but these schemes typically perform poorly when the noise is non-Gaussian and/or impulsive. This paper is concerned with maximum likelihood array processing in non-Gaussian noise. We present the Cramer-Rao bound on the variance of angle-of-arrival estimates for arbitr... View full abstract»

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  • Reply to "Comments on 'Resolution in time-frequency'"

    Publication Year: 2000, Page(s):3586 - 3587
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (76 KB)

    The authors reply that the first sentence of the conjecture (numbered 5), as stated by Dr. Knockaert (see ibid., vol.48, no.12, p.3585-86, 2000) in his comments, was proven first by Dembo et al. (1991). This they discovered in March 1999. Furthermore, Dr. M. Doroslovacki of George Washington University pointed out in March 1999 that a time sequence used by Donoho et al. (1989) was a counter-exampl... View full abstract»

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  • Generalized forward/backward subaperture smoothing techniques for sample starved STAP

    Publication Year: 2000, Page(s):3569 - 3574
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    A major issue in space-time adaptive processing (STAP) for moving target indicator (MTI) radar is the so-called sample support problem. Often, the available sample support for estimating the requisite interference covariance matrix is inadequate, thereby precluding STAP beamforming utilizing many adaptive degrees-of-freedom (DOFs). Although deterministic rank-reduction methods can reduce sample su... View full abstract»

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  • Algorithms for designing wavelets to match a specified signal

    Publication Year: 2000, Page(s):3395 - 3406
    Cited by:  Papers (72)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB)

    Algorithms for designing a mother wavelet ψ(x) such that it matches a signal of interest and such that the family of wavelets {2-(j2)/ψ(2-jx-k)} forms an orthonormal Riesz basis of L2(ℛ) are developed. The algorithms are based on a closed form solution for finding the scaling function spectrum from the wavelet spectrum. Many applications require wavele... 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