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IEEE Transactions on Signal Processing

Issue 10 • Oct 1998

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Displaying Results 1 - 25 of 30
  • LMS estimation via structural detection

    Publication Year: 1998, Page(s):2651 - 2663
    Cited by:  Papers (65)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (480 KB)

    We consider the LMS estimation of a channel that may be well approximated by an FIR model with only a few nonzero tap coefficients within a given delay horizon or tap length n. When the number of nonzero tap coefficients m is small compared with the delay horizon n, the performance of the LMS estimator is greatly enhanced when this specific structure is exploited. We propose a consistent algorithm... View full abstract»

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  • Localization of multiple sources with moving arrays

    Publication Year: 1998, Page(s):2736 - 2743
    Cited by:  Papers (14)  |  Patents (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    We consider the problem of localizing multiple narrowband stationary signals using an arbitrary time-varying array such as an array mounted on a moving platform. We assume a Gaussian stochastic model for the received signals and employ the generalized least squares (GLS) estimator to get an asymptotically efficient estimation of the model parameters. In case the signals are a priori known to be un... View full abstract»

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  • Frequency-warped filter banks and wavelet transforms: a discrete-time approach via Laguerre expansion

    Publication Year: 1998, Page(s):2638 - 2650
    Cited by:  Papers (14)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (404 KB)

    We introduce a new generation of perfect-reconstruction filter banks that can be obtained from classical critically sampled filter banks by means of frequency transformations. The novel filters are Laguerre type IIR filters that can be directly derived and designed from ordinary orthogonal or biorthogonal filter banks. Generalized downsampling and upsampling operators based on dispersive delay lin... View full abstract»

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  • An error control scheme for transmission of vector quantization data over noisy channels

    Publication Year: 1998, Page(s):2767 - 2780
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (360 KB)

    This paper presents an error control scheme for transmitting vector-quantized data over noisy channels. First, we review a self-organizing feature map (SOFM) based approach to construct the mapping from the codebook of the quantizer to the channel signal set of the communication system. This approach is robust with respect to channel noise even if we do not use any error control scheme in the comm... View full abstract»

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  • Adaptive precompensation of Wiener systems

    Publication Year: 1998, Page(s):2825 - 2829
    Cited by:  Papers (33)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    This article presents an adaptive precompensation technique for the Wiener system: a class of nonlinear systems that can be represented by the interconnection of a linear dynamic subsystem and a memoryless nonlinear subsystem. An adaptive algorithm for adjusting the parameters of the precompensator, structured by a Hammerstein model, is derived using the stochastic gradient method. The validity of... View full abstract»

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  • Asymptotic MAP criteria for model selection

    Publication Year: 1998, Page(s):2726 - 2735
    Cited by:  Papers (77)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    The two most popular model selection rules in signal processing literature have been Akaike's (1974) criterion (AIC) and Rissanen's (1978) principle of minimum description length (MDL). These rules are similar in form in that they both consist of data and penalty terms. Their data terms are identical, but the penalties are different, MDL being more stringent toward overparameterization. AIC penali... View full abstract»

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  • Discrete-time local polynomial approximation of the instantaneous frequency

    Publication Year: 1998, Page(s):2626 - 2637
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    The local polynomial approximation (LPA) of the time-varying phase is used to develop a new form of the Fourier transform and the local polynomial periodogram (LPP) as an estimator of the instantaneous frequency (IF) Ω(t) of a harmonic complex-valued signal. The LPP is interpreted as a time-frequency energy distribution over the t-(Ω(t), Ω1(t)),...,Ω... View full abstract»

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  • Subspace approach for the design of cosine-modulated filter banks with linear-phase prototype filter

    Publication Year: 1998, Page(s):2812 - 2818
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A method for designing perfect reconstruction (PR) prototypes for paraunitary cosine-modulated filter banks is presented. The design procedure is based on a subspace approach that allows linear combinations of even-length linear-phase PR prototype filters in such a way that the resulting filter is also a linear-phase PR prototype. Within a given subspace, the weights of the optimal linear combinat... View full abstract»

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  • A statistical resolution theory of the AR method of spectral analysis

    Publication Year: 1998, Page(s):2757 - 2766
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The autoregressive (AR) method of spectral analysis is widely used in diverse areas for its solid theoretical foundation, interesting physical interpretation, computational efficiency, and, more importantly, high resolution capability. Various aspects of its statistical performance have been investigated. However, the resolution probability that provides the most rigorous description of the spectr... View full abstract»

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  • A sampling theorem for shift-invariant subspace

    Publication Year: 1998, Page(s):2822 - 2824
    Cited by:  Papers (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB)

    A sampling theorem for regular sampling in shift-invariant subspaces is established. The sufficient-necessary condition for which it holds is found. Then, the theorem is modified to the shift sampling in shift-invariant subspaces by using the Zak transform. Finally, some examples are presented to show the generality of the theorem View full abstract»

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  • Bi-iteration recursive instrumental variable subspace tracking and adaptive filtering

    Publication Year: 1998, Page(s):2708 - 2725
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (548 KB)

    In this paper, we propose a class of fast sequential bi-iteration singular value (Bi-SVD) subspace tracking algorithms for adaptive eigendecomposition of the cross covariance matrix in the recursive instrumental variable (RIV) method of system identification. These algorithms can be used for RIV subspace processing of signals in unknown correlated Gaussian noise. Realizations with O(Nr2... View full abstract»

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  • Separation of cochannel signals in TDMA mobile radio

    Publication Year: 1998, Page(s):2684 - 2697
    Cited by:  Papers (20)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (556 KB)

    We propose a sequential algorithm that separates cochannel time-division multiple-access (TDMA) signals that encounter multipath interference and noise. The receiver employs a multistage architecture where each stage consists of a beamformer and an equalizer that isolates one source, compensates for intersymbol interference (ISI), and demodulates the data. A problem encountered with such bursty so... View full abstract»

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  • Covariance analysis of time delay estimates for strained signals

    Publication Year: 1998, Page(s):2589 - 2600
    Cited by:  Papers (13)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    Estimates of time-varying delays from the ultrasonic echo signals of compressed biological media are the basis of a new type of medical imaging known as elastography. This paper is focused on predicting the covariance between time delays estimated from sequential Gaussian-weighted echo segments that overlap. The accuracy of the analysis was tested and improved by comparisons with measurements invo... View full abstract»

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  • Theory and applications of adaptive constant-Q distributions

    Publication Year: 1998, Page(s):2616 - 2625
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (336 KB)

    A new class of signal adaptive time-frequency representations called the adaptive constant-Q distribution (AQD) is introduced. The AQD exploits a priori knowledge about a signal's instantaneous frequency and bandwidth to perform signal-dependent smoothing of the Wigner distribution. The objective is to achieve a good tradeoff between reducing the variance and preserving the resolution by means of ... View full abstract»

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  • Multidimensional, paraunitary principal component filter banks

    Publication Year: 1998, Page(s):2807 - 2812
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB)

    In this correspondence, the one-dimensional (1-D) principal component filter banks (PCFB's) derived by Tsatsatsanis and Giannakis (1995) are generalized to higher dimensions. As presented by Tsatsatsanis and Giannakis, PCFB's minimize the mean-squared error (MSE) when only Q out of P subbands are retained. Previously, two-dimensional (2-D) PCFB's were proposed by Tirakis et al. (1995). The work by... View full abstract»

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  • Adaptive parallel-cascade truncated Volterra filters

    Publication Year: 1998, Page(s):2664 - 2673
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (364 KB)

    This paper studies adaptive truncated Volterra filters employing parallel-cascade structures. Parallel-cascade realizations implement higher order Volterra systems as a parallel connection of multiplicative combinations of lower order truncated Volterra systems. A normalized LMS adaptive filter is developed, and its performance capabilities are evaluated using a series of simulation experiments. T... View full abstract»

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  • Parameter estimation for autoregressive Gaussian-mixture processes: the EMAX algorithm

    Publication Year: 1998, Page(s):2744 - 2756
    Cited by:  Papers (19)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    The problem of estimating parameters of discrete-time non-Gaussian autoregressive (AR) processes is addressed. The subclass of such processes considered is restricted to those whose driving noise samples are statistically independent and identically distributed according to a Gaussian-mixture probability density function (pdf). Because the likelihood function for this problem is typically unbounde... View full abstract»

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  • Multilinguistic handwritten character recognition by Bayesian decision-based neural networks

    Publication Year: 1998, Page(s):2781 - 2789
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    In this paper, we present a Bayesian decision-based neural network (BDNN) for multilinguistic handwritten character recognition. The proposed self-growing probabilistic decision-based neural network (SPDNN) adopts a hierarchical network structure with nonlinear basis functions and a competitive credit-assignment scheme. Our prototype system demonstrates a successful utilization of SPDNN to the han... View full abstract»

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  • Parallel-cascade realizations and approximations of truncated Volterra systems

    Publication Year: 1998, Page(s):2829 - 2832
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (124 KB)

    Introduces parallel-cascade realizations of truncated Volterra systems with an arbitrary but finite order of nonlinearity. Parallel-cascade realizations implement higher order Volterra systems using parallel and multiplicative combinations of lower order Volterra systems. A systematic way of approximating higher order Volterra systems in parallel-cascade form using a reduced number of branches and... View full abstract»

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  • Convolution theorems for linear transforms

    Publication Year: 1998, Page(s):2819 - 2821
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (104 KB)

    This correspondence explores the existence of convolution theorem for linear transformations under a variety of different assumptions. There are eight convolution theorems, all Fourier-related with only N operations in the transform domain and no ordering constraints on the convolution components in the result. They include circular convolutions and correlations View full abstract»

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  • A three-state biological point process model and its parameter estimation

    Publication Year: 1998, Page(s):2698 - 2707
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    The Poisson random process is widely used to describe experiments involving discrete arrival data. However, for creating models of egg-laying behavior in neural biology studies on the nematode C. elegans, we have found that homogeneous Poisson processes are inadequate to capture the measured temporal patterns. We present here a novel three-state model that effectively represents the measured tempo... View full abstract»

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  • Continuous-time envelope-constrained filter design via Laguerre filters and ℋ optimization methods

    Publication Year: 1998, Page(s):2601 - 2610
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    The envelope-constrained filtering problem is concerned with the design of a time-invariant filter to process a given input signal such that the noiseless output of the filter is guaranteed to lie within a specified output mask while minimizing the noise gain of the filter. An algorithm is developed to solve the continuous-time envelope-constrained filter design problem with the ℋ∞... View full abstract»

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  • New class of zero-forcing cost functions in blind equalization

    Publication Year: 1998, Page(s):2674 - 2683
    Cited by:  Papers (17)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (424 KB)

    The use of gradient descent recursive algorithms in blind adaptive equalization requires a cost function with a unique minimum such that the FIR equalizer setup removes sufficient intersymbol interference (ISI). A class of such cost functions is proposed. The newly proposed class is based on minimizing the difference between any two norms of the joint channel-equalizer impulse response, each raise... View full abstract»

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  • Data smoothing by cubic spline filters

    Publication Year: 1998, Page(s):2790 - 2796
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (272 KB)

    In this correspondence, a digital filter that allows the computation of a smoothing cubic spline for equispaced data with a constant control parameter is proposed. Filters to compute its first and second derivatives are also presented. Derived from the classical matrix solution, these filters offer an efficient way to calculate smoothed data and its derivatives, especially when the length of data ... View full abstract»

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  • Input Nyquist sampling suffices to identify and compensate nonlinear systems

    Publication Year: 1998, Page(s):2833 - 2837
    Cited by:  Papers (20)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Nonlinear systems usually cause spectral spreading resulting in an output signal bandwidth greater than that of the input signal. When identifying and compensating nonlinear systems by digital methods, it has been common practice to set the sampling frequency at the Nyquist rate of the output signal. This correspondence presents experimental evidence for the author's proposal that nonlinear system... 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