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IEEE Transactions on Signal Processing

Issue 6 • Date Jun 1995

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Displaying Results 1 - 25 of 27
  • Estimating spectral correlations with simple nonlinear transformations

    Publication Year: 1995, Page(s):1525 - 1526
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    Two computationally efficient cyclic spectral analysis algorithms are compared using a computer simulation. Each algorithm replaces multiplications with sign changes and multiplexing operations. Compared with conventional frequency smoothing estimators, the quadruplex and one bit spectral correlation algorithms suffered losses in output signal to noise ratio of approximately 0.6 dB and 1.9 dB, res... View full abstract»

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  • Wavelet neural networks for function learning

    Publication Year: 1995, Page(s):1485 - 1497
    Cited by:  Papers (204)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (996 KB)

    A wavelet-based neural network is described. The structure of this network is similar to that of the radial basis function (RBF) network, except that in the present paper the radial basis functions are replaced by orthonormal scaling functions that are not necessarily radial-symmetric. The efficacy of this type of network in function learning and estimation is demonstrated through theoretical anal... View full abstract»

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  • Intensity estimation from shot-noise data

    Publication Year: 1995, Page(s):1527 - 1531
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (340 KB)

    The estimation of the intensity function of a Poisson-driven shot-noise process is addressed using a regularization technique, where the data is modeled as a signal term plus a signal-dependent noise term. A new data-based method for selecting a pair of regularization parameters is presented and compared with the minimum unbiased risk method. The detail in the intensity function can be recovered b... View full abstract»

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  • Steering vector estimation in uncalibrated arrays

    Publication Year: 1995, Page(s):1397 - 1412
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1296 KB)

    This paper presents an iterative algorithm for estimating the signal steering vectors and associated power levels received by an array of uncalibrated isotropic sensors. The inputs are assumed to consist of narrowband, uncorrelated directional signals in the presence of additive white noise. An iterative algorithm is employed to successively search for estimates that simultaneously satisfy a signa... View full abstract»

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  • Complex hybrid correlators: an extended analysis of their performance

    Publication Year: 1995, Page(s):1531 - 1535
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    Discrete-time hybrid correlators were devised and their accuracy was provided in a closed form for the simplest cases of instantaneous nonlinearities, in the reference case of complex Gaussian stationary processes. The article extends the performance analysis to finer phase nonlinearities View full abstract»

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  • Pipelined adaptive DFE architectures using relaxed look-ahead

    Publication Year: 1995, Page(s):1368 - 1385
    Cited by:  Papers (13)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1196 KB)

    Fine-grain pipelined adaptive decision-feedback equalizer (ADFE) architectures are developed using the relaxed look-ahead technique. This technique, which is an approximation to the conventional look-ahead computation, maintains functionality of the algorithm rather than the input-output behavior. Thus, it results in substantial hardware savings as compared to either parallel processing or look-ah... View full abstract»

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  • Processors for generalized stack filters

    Publication Year: 1995, Page(s):1541 - 1546
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    New processor structures for generalized stack filters are proposed. They can be implemented using different numbers of Boolean function units. The class of pipeline-parallel structures for generalized stack filters is simple and modular in structure, and suitable for VLSI implementation. Coder and decoder networks are developed for the mutual transform of binary-weighted and unary-weighted codes ... View full abstract»

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  • Analysis of the performance and sensitivity of eigendecomposition-based detectors

    Publication Year: 1995, Page(s):1413 - 1426
    Cited by:  Papers (31)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (888 KB)

    A new framework is presented for the analysis of the performance of detection methods, such as AIC and MDL, which are based on the eigenvalues of the sample covariance matrix. It is shown that theoretical analysis of the probabilities of overestimation and underestimation can be much more conveniently carried out via a proposed, particularly simple, sequence of statistics. Also, the breakdown of t... View full abstract»

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  • Exact interpolation and iterative subdivision schemes

    Publication Year: 1995, Page(s):1348 - 1359
    Cited by:  Papers (5)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (920 KB)

    We examine the circumstances under which a discrete-time signal can be exactly interpolated given only every Mth sample. After pointing out the connection between designing an M-fold interpolator and the construction of an M-channel perfect reconstruction filter bank, we derive necessary and sufficient conditions on the signal under which exact interpolation is possible. Bandlimited signals are on... View full abstract»

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  • On the first order equalization of hidden Markov models

    Publication Year: 1995, Page(s):1522 - 1524
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    The article exploits some properties of the “first order equalization” technique, used to increase the recognition performance of speech. It shows that if the eigenvalues of the covariance matrix of observations are restricted, then a solution exists for this problem, although it may not be unique, View full abstract»

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  • On necessary and sufficient conditions for perfect reconstruction multidimensional delay chain systems

    Publication Year: 1995, Page(s):1515 - 1519
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    We present some necessary and sufficient conditions for a perfect reconstruction (PR) modified multidimensional (MD) delay chain system. With these results, one is able to systematically check if a D-dimensional delay chain system with a D×D sampling matrix M and a D×D delay matrix L has a PR property in a simpler way than before, where the matrix module operations are avoided. Moreove... View full abstract»

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  • On multiple pattern extraction using singular value decomposition

    Publication Year: 1995, Page(s):1536 - 1540
    Cited by:  Papers (25)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    This paper presents a new concept of decomposition of a signal into component periodic waveforms. The singular value decomposition (SVD) is used for the detection of periodicity and separation of the component signals. The signal is configured for the sequential extraction of successively weaker components with different period lengths. The approach enjoys the numerical stability associated with S... View full abstract»

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  • Performance analysis of the MVDR spatial spectrum estimator

    Publication Year: 1995, Page(s):1427 - 1437
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (768 KB)

    The performance of the minimum variance distortionless response spectrum estimator is analyzed. Finite data effects and the sensitivity of the method to random perturbations in the signal model and in the noise covariance matrix are studied. The snapshots are assumed to be complex independent identically distributed Gaussian vectors. An expression for the exact model asymptotic bias is also derive... View full abstract»

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  • Constraints for maximally flat optimum broadband antenna arrays

    Publication Year: 1995, Page(s):1334 - 1347
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1008 KB)

    Frequency response shaping for the direct form pre-steered broadband (PB) antenna array processor is often achieved by imposing look direction constraints on the weights of the processor. This results in a linearly constrained optimization problem. To ensure a maximally flat spatial response of a specified order in the look direction of the PB processor, additional constraints known as derivative ... View full abstract»

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  • A recursive frequency-sampling method for designing zero-phase FIR filters by nonuniform samples

    Publication Year: 1995, Page(s):1461 - 1467
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (520 KB)

    A novel frequency-sampling method for designing zero-phase FIR filters from nonuniform samples is presented. The method is fast, simple, recursive and can be used in the design of 1D or 2D zero-phase FIR filters by imposing some mild constraints on sample locations in the 2D frequency plane. Based on a novel Newton representation of the filter transfer function the proposed method guarantees real ... View full abstract»

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  • Bootstrap multiple tests applied to sensor location

    Publication Year: 1995, Page(s):1386 - 1396
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (988 KB)

    A method for finding optimal locations of vibration sensors within a group of sensors for detecting knock in combustion engines is proposed. It differs from other techniques in that only signal processing and statistical tests are used. The method is based on linearly predicting the in-cylinder pressure in a combustion chamber from the output signals of a group of vibration sensors being distribut... View full abstract»

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  • A fast block-based nonlinear decoding algorithm for ΣΔ modulators

    Publication Year: 1995, Page(s):1360 - 1367
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (712 KB)

    Previous work has established that the digital output of a ΣΔ modulator as an A/D converter contains more information about the analog input than is extracted with conventional linear filtering. Under reasonable mathematical assumptions, optimal nonlinear decoding of the digital output can achieve significantly larger signal-to-noise ratios than linear filtering. However, the hitherto ... View full abstract»

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  • On-line spectral estimation of nonstationary time series based on AR model parameter estimation and order selection with a forgetting factor

    Publication Year: 1995, Page(s):1519 - 1522
    Cited by:  Papers (10)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    A new method for on-line spectral estimation of nonstationary time series via autoregressive (AR) model construction is proposed. The method consists of on-line parameter estimation based on the recursive least squares ladder estimation algorithm with a forgetting factor and on-line order determination based on AIC with some modifications. The effectiveness of the proposed method is demonstrated b... View full abstract»

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  • Source number estimators using transformed Gerschgorin radii

    Publication Year: 1995, Page(s):1325 - 1333
    Cited by:  Papers (93)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (744 KB)

    We introduce effective uses of Gerschgorin radii of the unitary transformed covariance matrix for source number estimation. There are two approaches, likelihood and heuristic, used for developing the detection criteria. The likelihood approach combines the Gerschgorin radii to the well-known source number detectors and improves their detection performances for Gaussian and white noise processes. I... View full abstract»

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  • Correlation estimators based on simple nonlinear transformations

    Publication Year: 1995, Page(s):1438 - 1444
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The computational cost of estimating correlations may be reduced by employing sums of simple nonlinear functions of the data. A quadruplex transformation is presented and the performance of the associated estimator is analyzed for real and complex Gaussian processes. With independent observations, the variance of the estimator is approximately 14% higher than that obtained by averaging lag product... View full abstract»

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  • Macro pipelining based scheduling on high performance heterogeneous multiprocessor systems

    Publication Year: 1995, Page(s):1468 - 1484
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1380 KB)

    Presents a technique for pipelining heterogeneous multiprocessor systems, macro pipelining based scheduling. The problem can be identified as a combination of optimal task/processor assignment to pipeline stages as well as a scheduling problem. The authors propose a new technique based on iterative applications of partitioning and scheduling schemes whereby the number of pipeline stages are identi... View full abstract»

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  • Analysis of multicomponent LFM signals by a combined Wigner-Hough transform

    Publication Year: 1995, Page(s):1511 - 1515
    Cited by:  Papers (125)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB)

    The aim of the paper is the performance evaluation of a method for the analysis of mono- or multicomponent linear-frequency modulation (LFM) signals, based on the Hough transform of the Wigner-Ville distribution of the signals. A closed form expression is found for the signal-to-noise ratio and the parameter estimation accuracy. The overall method, as any nonlinear method, exhibits a threshold eff... View full abstract»

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  • A general characterization of lowpass FIR frequency response in the transition band

    Publication Year: 1995, Page(s):1508 - 1510
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    A general model is derived for the frequency response of lowpass FIR filters in the transition band which has applications to filter bank aliasing calculations and convergence of the LMS algorithm. It is shown that as a class, these filters exhibit a frequency response whose squared magnitude rolls off approximately as (ω0-ω)q, where q is a positive exponent that ... View full abstract»

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  • Conjugate gradient method in adaptive bilinear filtering

    Publication Year: 1995, Page(s):1503 - 1508
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    The application of the conjugate gradient (CG) method for the identification of bilinear systems is investigated. An algorithm based on the CG method is developed for adaptive bilinear digital filtering. In this algorithm, the optimization is done over blocks of input and output data rather than a single pair of data. However, only one iteration and coefficient update is done for every sample of d... View full abstract»

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  • Robust transient signal detection using the oversampled Gabor representation

    Publication Year: 1995, Page(s):1498 - 1502
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The Gabor representation has been investigated previously as an effective and efficient means of detecting transient signals. The major problem associated with the most commonly used form of the Gabor representation is that it assumes that signals have integer arrival times and modulation frequencies-an assumption that, if violated, causes signal miss-match and deterioration in detector performanc... 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