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IEEE Transactions on Signal Processing

Issue 1 • Jan. 1999

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Displaying Results 1 - 25 of 38
  • Abstracts of manuscripts in review

    Publication Year: 1999, Page(s):280 - 282
    Request permission for commercial reuse | PDF file iconPDF (43 KB)
    Freely Available from IEEE
  • Direction finding with fewer receivers via time-varying preprocessing

    Publication Year: 1999, Page(s):2 - 9
    Cited by:  Papers (22)  |  Patents (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    We present a new technique for localizing multiple narrowband sources by a passive sensor array based on dimensionality-reducing time-varying preprocessing of the sensor outputs. The technique allows a significant reduction in the number of receivers required for the implementation with only two receivers sufficing in the extreme case. The estimation method we use is based on approximating the cor... View full abstract»

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  • Estimating two-dimensional frequencies by a cumulant-based FBLP method

    Publication Year: 1999, Page(s):262 - 266
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    This correspondence presents a higher order statistics (HOS) based modified version of the two-dimensional forward-backward linear prediction (2-D FBLP) method. The modified method is suitable for estimating 2-D frequencies of a 2-D data set observed in white or colored Gaussian noise (W/CGN) of unknown covariance. Simulation results are provided to verify the effectiveness of the proposed method View full abstract»

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  • A new fast block adaptive algorithm

    Publication Year: 1999, Page(s):75 - 87
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (532 KB)

    This paper describes a novel efficient algorithm appropriate for adapting filters of long order. The scheme is an exact block processing counterpart of the fast Newton transversal filtering algorithm. The filters required by the algorithm blocks are much smaller than the filter length, and the obtained estimates are mathematically equivalent to those of the sample-by-sample version. This leads to ... View full abstract»

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  • Second-order statistics-based blind equalization of IIR single-input multiple-output channels with common zeros

    Publication Year: 1999, Page(s):147 - 157
    Cited by:  Papers (13)  |  Patents (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (456 KB)

    The problem of blind equalization of single-input multiple-output (SIMO) communications channels is considered using only the second-order statistics of the data. Such models arise when a single receiver data is fractionally sampled (assuming that there is excess bandwidth) or when an antenna array is used with or without fractional sampling. We focus on direct design of finite-length minimum mean... View full abstract»

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  • Teager energy and the ambiguity function

    Publication Year: 1999, Page(s):260 - 262
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (112 KB)

    The connection between the Teager energy operator and the ambiguity function is established in this correspondence after defining the Teager operator over complex-valued signals. This relation allows the use of the Teager energy in estimating the second moment angular bandwidth and the moments of a signal duration (spread) and that of its spectrum View full abstract»

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  • Direct blind equalizers of multiple FIR channels: a deterministic approach

    Publication Year: 1999, Page(s):62 - 74
    Cited by:  Papers (39)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    Blind equalization of single-input multi-output channels has practical value for inverse problems encountered in communications, sonar, and seismic data processing. Relying on diversity (sufficient number of multiple outputs), we bypass the channel estimation step and derive direct blind FIR equalizers of co-prime FIR channels. There are no constraints on the inaccessible input, apart from a minim... View full abstract»

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  • Shift covariant time-frequency distributions of discrete signals

    Publication Year: 1999, Page(s):133 - 146
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB)

    Many commonly used time-frequency distributions are members of the Cohen (1989) class. This class is defined for continuous signals, and since time-frequency distributions in the Cohen class are quadratic, the formulation for discrete signals is not straightforward. The Cohen class can be derived as the class of all quadratic time-frequency distributions that are covariant to time shifts and frequ... View full abstract»

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  • Stable signal and image reconstruction from noisy Fourier transform phase

    Publication Year: 1999, Page(s):244 - 250
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (540 KB)

    The problem of reconstruction of finite signals and images from the noisy Fourier transform phase is addressed. The problem is pointed out to be ill-posed with respect to distortion in the phase. Regularizing reconstruction algorithms are proposed that significantly improve estimates of signals or images reconstructed from their noisy phases View full abstract»

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  • Generalized Gaussian modeling of correlated signal sources

    Publication Year: 1999, Page(s):217 - 219
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB)

    A generalized Gaussian model for correlated signal sources is introduced. The probability density function of a first-order autoregressive process driven by generalized Gaussian white noise is approximated by a generalized Gaussian probability density function. The interdependence between the correlation coefficient and the shape parameter of the first-order autoregressive process and the shape pa... View full abstract»

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  • Hybrid linear/bilinear time-scale analysis

    Publication Year: 1999, Page(s):254 - 259
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    The introduce a new method for the time-scale analysis of nonstationary signals. Our work leverages the success of the “time-frequency distribution series/cross-term deleted representations” into the time-scale domain to match wideband signals that are better modeled in terms of time shifts and scale changes than in terms of time and frequency shifts. Using a wavelet decomposition and ... View full abstract»

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  • Fast computation of the exact FIM for deterministic signals in colored noise

    Publication Year: 1999, Page(s):52 - 61
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (380 KB)

    A fast algorithm for computing the exact finite-sample Fisher information matrix (FIM) for the parameters of a deterministic signal observed in Gaussian AR noise is derived. In the case of a harmonic signal with random phases, closed-form expressions for the finite-sample posterior Cramer-Rao bound (PCRB) are established. It is shown that the fast algorithm is also useful for computing the conditi... View full abstract»

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  • Nearfield beamforming using radial reciprocity

    Publication Year: 1999, Page(s):33 - 40
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    We establish the asymptotic equivalence, up to complex conjugation, of two problems: 1) determining the near-field performance of a far-field beam pattern specification and 2) determining the equivalent far-field beam pattern corresponding to a near-field beam pattern specification. Using this reciprocity relationship, we develop a computationally simple procedure to design a beamforming array to ... View full abstract»

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  • Estimating rate constants in hidden Markov models by the EM algorithm

    Publication Year: 1999, Page(s):226 - 228
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (140 KB)

    The EM algorithm, e.g., the Baum-Welch (1970) re-estimation, is an important tool for parameter estimation in discrete-time hidden Markov models. We present a direct re-estimation of rate constants for applications in which the underlying Markov process is continuous in time. Previous estimation of discrete-time transition probabilities is not necessary View full abstract»

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  • Sequential algorithms for observation selection

    Publication Year: 1999, Page(s):123 - 132
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Some signal reconstruction problems allow for flexibility in the selection of observations and, hence, the signal formation equation. In such cases, we have the opportunity to determine the best combination of observations before acquiring the data. We present and analyze two classes of sequential algorithms to select observations-sequential backward selection (SBS) and sequential forward selectio... View full abstract»

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  • Multipath time-delay detection and estimation

    Publication Year: 1999, Page(s):237 - 243
    Cited by:  Papers (62)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    A transmitted and known signal is observed at the receiver through more than one path in additive noise. The problem is to estimate the number of paths and, for each of them, the associated attenuation and delay. We propose a deconvolution approach with an additive regularization term built around an l1 norm. The underlying optimization problem is transformed into a quadratic program an... View full abstract»

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  • FCA-ESPRIT: a closed-form 2-D angle estimation algorithm for filled circular arrays with arbitrary sampling lattices

    Publication Year: 1999, Page(s):213 - 217
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB)

    This article addresses the simultaneous estimation of the azimuth and elevation angles of multiple co-channel signals incident upon an array of antennas. A new closed-form algorithm that is applicable with filled circular arrays (FCAs) is presented. The algorithm, which is called FCA-ESPRIT, is applicable with any FCA geometry, e.g., FCAs constructed using rectangular, hexagonal, polar, or random ... View full abstract»

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  • Adaptive detection for unknown noise power spectral densities

    Publication Year: 1999, Page(s):10 - 21
    Cited by:  Papers (8)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (604 KB)

    The detection of a known broadband signal in colored noise of unknown power spectral density is addressed. Motivated by the consistency of the integrated periodogram, a new detector is proposed. Its asymptotic performance is proven to be only slightly poorer than the optimal but unrealizable Neyman-Pearson detector. It also possesses the CFAR property asymptotically and should therefore be quite v... View full abstract»

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  • Two-dimensional delta domain lattice filter and its application to adaptive image enhancement

    Publication Year: 1999, Page(s):266 - 273
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (484 KB)

    In this correspondence, a new 2-D lattice filter structure in the so-called delta domain, which avoids possible numerical instabilities that may occur in traditional q-domain based algorithms, has been developed. This structure has been used to implement an adaptive lattice noise canceller. Very successful results have been obtained, even under very low signal-to-noise conditions View full abstract»

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  • On the numerical stability and accuracy of the conventional recursive least squares algorithm

    Publication Year: 1999, Page(s):88 - 96
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (352 KB)

    We study the nonlinear round-off error accumulation system of the conventional recursive least squares algorithm, and we derive bounds for the relative precision of the computations in terms of the conditioning of the problem and the exponential forgetting factor, which guarantee the numerical stability of the finite-precision implementation of the algorithm; the positive definiteness of the finit... View full abstract»

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  • Synchronous DS-CDMA downlink with frequency selective fading

    Publication Year: 1999, Page(s):158 - 167
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    Synchronous code-division multiple-access (CDMA) techniques possess intrinsic protection against co-channel interference due to the orthogonal spreading codes used. However, in the presence of multipath, the signals lose their orthogonality property, leading to increased cross correlation. In these cases, channel estimation may be needed in order to improve the detection of the desired symbols. We... View full abstract»

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  • Cone-kernel representation versus instantaneous power spectrum

    Publication Year: 1999, Page(s):250 - 254
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB)

    The Cone-kernel representation (CKR) and the instantaneous power spectrum (IFS) are two time-frequency representations (TFRs) where the cross-terms are localized in the region of auto-terms. Exploring their relationship for discrete sequences, we show that the IFS kernel is only two extreme terms of the CKR kernel. Further comparing other properties of these two TFRs, viz., invertibility, aliasing... View full abstract»

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  • A method for finding orthogonal wavelet filters with good energy tiling characteristics

    Publication Year: 1999, Page(s):220 - 223
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB)

    This article describes a method for finding orthogonal wavelet filters with minimum out of tile energy (OTE). An objective function bounding the OTE is found and minimized using the Nelder-Meade simplex algorithm. General results are discussed, and a 22-coefficient filter is presented View full abstract»

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  • Stochastic theory of continuous-time state-space identification

    Publication Year: 1999, Page(s):41 - 51
    Cited by:  Papers (51)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (600 KB)

    This paper presents theory, algorithms, and validation results for system identification of continuous-time state-space models from finite input-output sequences. The algorithms developed are methods of subspace model identification and stochastic realization adapted to the continuous-time context. The resulting model can be decomposed into an input-output model and a stochastic innovations model.... View full abstract»

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  • On designing stable allpass filters using AR modeling

    Publication Year: 1999, Page(s):229 - 231
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB)

    By exploiting the minimum-phase property of an autoregressive (AR) modeling technique, we propose a simple method for designing allpass filters that are guaranteed to be stable. It is assumed that equispaced samples of the desired allpass filter's phase function is given 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