IEEE Transactions on Signal Processing

Issue 12 • Dec. 1996

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Displaying Results 1 - 25 of 31
  • List of reviewers

    Publication Year: 1996, Page(s):3178 - 3181
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    Freely Available from IEEE
  • 1996 Index IEEE Transactions on Signal vol. 44

    Publication Year: 1996, Page(s):1 - 42
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    Freely Available from IEEE
  • Transform domain adaptive linear phase filter

    Publication Year: 1996, Page(s):3142 - 3146
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (460 KB)

    Describes a new adaptive linear-phase filter whose weights are updated by the normalized least-mean-square (LMS) algorithm in the transform domain. This algorithm provides a faster convergence rate compared with the time domain linear phase LMS algorithm. Various real-valued orthogonal transforms are investigated such as the discrete cosine transform (DCT), discrete Hartley transform (DHT), and po... View full abstract»

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  • Analysis of multidimensional DSP specifications

    Publication Year: 1996, Page(s):3169 - 3174
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (664 KB)

    Data flow languages are a natural and more formal way to describe the flow of computations in a DSP application. However, when the language contains extended array constructs, extra data dependency checks are needed. This correspondence describes a new model to represent multidimensional arrays and presents several data flow analysis techniques for multidimensional arrays. Results show very fast r... View full abstract»

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  • Variable-block-size lapped transforms

    Publication Year: 1996, Page(s):3139 - 3142
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (456 KB)

    A structure for implementing lapped transforms with time-varying block sizes that allows full orthogonality of the transient transforms is presented. The formulation is based on a factorization of the transfer matrix into orthogonal factors. Such an approach can be viewed as a sequence of stages with variable-block-size transforms separated by sample-shuffling (delay) stages. Details and design ex... View full abstract»

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  • Optimal decorrelating receivers for DS-CDMA systems: a signal processing framework

    Publication Year: 1996, Page(s):3044 - 3055
    Cited by:  Papers (72)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1232 KB)

    Code division multiple access (CDMA) schemes allow a number of asynchronous users to share a transmission medium with minimum cooperation among them. However, sophisticated signal processing algorithms are needed at the receiver to combat interference from other users and multipath effects. A discrete-time multirate formulation is introduced for asynchronous CDMA systems, which can incorporate mul... View full abstract»

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  • A theorem in probability and its applications in multidimensional signal processing

    Publication Year: 1996, Page(s):3167 - 3169
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (300 KB)

    In this correspondence, we present a result in probability that does not exist in the literature of probability theory. We show one application of this theorem in multidimensional signal processing, which generalizes some of the existing results View full abstract»

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  • Unsupervised deconvolution of sparse spike trains using stochastic approximation

    Publication Year: 1996, Page(s):2988 - 2998
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1316 KB)

    This paper presents an unsupervised method for restoration of sparse spike trains. These signals are modeled as random Bernoulli-Gaussian processes, and their unsupervised restoration requires (i) estimation of the hyperparameters that control the stochastic models of the input and noise signals and (ii) deconvolution of the pulse process. Classically, the problem is solved iteratively using a max... View full abstract»

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  • Efficient implementation of Koilpillai-Vaidyanathan pseudo quadrature mirror filter (PQMF) banks

    Publication Year: 1996, Page(s):3135 - 3138
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (368 KB)

    An efficient implementation algorithm for the Koilpillai-Vaidyanathan (see ibid., vol.41, no.1, p.82-92, 1993) pseudo quadrature mirror filter (KVPQMF) bank, which is useful in audio compression schemes, is presented. The implementation employs a polyphase system with discrete cosine transforms (DCTs). Theoretical and practical results show a typical saving in computational load of 82% over the di... View full abstract»

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  • Convergence of the delayed normalized LMS algorithm with decreasing step size

    Publication Year: 1996, Page(s):3008 - 3016
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (852 KB)

    In several practical applications of the LMS algorithm, including certain VLSI implementations, the coefficient adaptation can be performed only after some fixed delay. The resulting algorithm is known as the delayed LMS (DLMS) algorithm in the literature. Previous published analyses of this algorithm are based on mean and moment convergence under the independence assumption between successive inp... View full abstract»

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  • Optimal quadratic detection and estimation using generalized joint signal representations

    Publication Year: 1996, Page(s):3031 - 3043
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1516 KB)

    Time-frequency analysis has significant advances in two main directions: statistically optimized methods that extend the scope of time-frequency-based techniques from merely exploratory data analysis to more quantitative application and generalized joint signal representations that extend time-frequency-based methods to a richer class of nonstationary signals. This paper fuses the two advances by ... View full abstract»

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  • Adaptive beamforming for satellite communication with selective earth coverage and jammer nulling capability

    Publication Year: 1996, Page(s):3162 - 3166
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (484 KB)

    An algorithm has been developed to control the antenna array beam pattern for satellite communication applications where the uplink received antenna is desired to provide beamforming capability for selective earth coverage and jamming protection. The problem can be formulated to determine the antenna weight to meet the user gain and jammer null requirements in their known directions, subject to th... View full abstract»

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  • Blind identification of digital communication channels with correlated noise

    Publication Year: 1996, Page(s):3154 - 3156
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (304 KB)

    Blind identification consists of estimating the impulse response of a linear, time-invariant channel used for transmission of digital data by observing the channel output without knowledge of the transmitted symbol sequence. We show how a previously proposed algorithm (Moulines et al., 1995) based on second-order statistics of the received signal can be modified to account for correlated noise View full abstract»

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  • Optimal linear detectors for additive noise channels

    Publication Year: 1996, Page(s):3079 - 3084
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (752 KB)

    In an attempt to gain insight into the design of linear detectors for additive white noise channels (discrete-time case), we describe several procedures, both optimal and suboptimal. Using the Wiener representation for nonlinear systems, we derive an ad hoc suboptimal design procedure. Exact designs are found when the noise amplitude's probability distribution is stable and when the noise is Lapla... View full abstract»

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  • Time-varying filters and filter banks: some basic principles

    Publication Year: 1996, Page(s):2971 - 2987
    Cited by:  Papers (26)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1768 KB)

    We study the fundamentals of time-varying filter banks (TVFB). Using a polyphase approach to TVFBs, we are able to show some unusual properties that are not exhibited by the conventional LTI filter banks. For example, we can show that for a perfect reconstruction (PR) TVFB, the losslessness of analysis bank does not always imply that of the synthesis bank, and replacing the delay z-1 in... View full abstract»

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  • Low-rank adaptive filters

    Publication Year: 1996, Page(s):2932 - 2947
    Cited by:  Papers (135)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1548 KB)

    We introduce a class of adaptive filters based on sequential adaptive eigendecomposition (subspace tracking) of the data covariance matrix. These new algorithms are completely rank revealing, and hence, they can perfectly handle the following two relevant data cases where conventional recursive least squares (RLS) methods fail to provide satisfactory results: (1) highly oversampled “smooth&r... View full abstract»

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  • Wigner-based formulation of the chirplet transform

    Publication Year: 1996, Page(s):3129 - 3135
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (756 KB)

    Using the Wigner distribution, we derive and analyze a matrix formulation for the chirplet transform, a signal analysis tool that generalizes the wavelet and short-time Fourier transforms. The formulation expresses the translations, scalings, and shears of the chirplet transform in terms of affine matrix transformations on the time-frequency plane. Our approach leads naturally to several new signa... View full abstract»

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  • Circular implementation of vector-channel lattices

    Publication Year: 1996, Page(s):3147 - 3149
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (328 KB)

    Discusses the circular (or periodic) implementation of vector-channel least-squares lattice filters. The resulting algorithm eliminates matrix inversions and greatly reduces matrix multiplications. Complete residual and AR coefficient algorithms are provided, as well as initialization and other implementation issues. A full treatment of the prediction error form of the lattices and its relationshi... View full abstract»

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  • Estimating particles velocity from laser measurements: maximum likelihood and Cramer-Rao bounds

    Publication Year: 1996, Page(s):3056 - 3068
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1112 KB)

    We address the problem of estimating particles velocity in the vicinity of an aircraft by means of a laser Doppler system. When a particle passes through the region of interference fringes generated by two coherent laser beams, the signal backscattered is of the form Aexp{-2α2·fd2t2 }cos{2πfdt}, where the Doppler frequency f View full abstract»

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  • Model based phase unwrapping of 2-D signals

    Publication Year: 1996, Page(s):2999 - 3007
    Cited by:  Papers (49)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1200 KB)

    A parametric model and a corresponding parameter estimation algorithm for unwrapping 2-D phase functions are presented. The proposed algorithm performs global analysis of the observed signal. Since this analysis is based on parametric model fitting, the proposed phase unwrapping algorithm has low sensitivity to phase aliasing due to low sampling rates and noise, as well as to local errors. In its ... View full abstract»

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  • Equivariant adaptive source separation

    Publication Year: 1996, Page(s):3017 - 3030
    Cited by:  Papers (748)  |  Patents (9)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1588 KB)

    Source separation consists of recovering a set of independent signals when only mixtures with unknown coefficients are observed. This paper introduces a class of adaptive algorithms for source separation that implements an adaptive version of equivariant estimation and is henceforth called equivariant adaptive separation via independence (EASI). The EASI algorithms are based on the idea of serial ... View full abstract»

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  • Fast design of 2-D linear-phase complex FIR digital filters by analytical least squares method

    Publication Year: 1996, Page(s):3157 - 3161
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (344 KB)

    Two-dimensional full-plane and half-plane filters are more general, and much better frequency responses can be obtained than the quarter-plane filters. In this correspondence, the analytical least squares method is generalized and extended for designing 2-D full-plane and half-plane linear phase complex FIR digital filters. The 2-D filter's coefficients can be effectively determined by use of a cl... View full abstract»

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  • Temporal and spatial sampling influence on the estimates of superimposed narrowband signals: when less can mean more

    Publication Year: 1996, Page(s):3085 - 3098
    Cited by:  Papers (28)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1448 KB)

    This paper addresses the influence that the sampling locations have on the estimated frequencies of superimposed sinusoids. This problem has application in harmonic time-series analysis or direction-finding phased-array systems. Generalized mathematical bounds are developed in terms that are independent of the array locations and have an intuitively appealing physical interpretation. They establis... View full abstract»

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  • Difference equation representation of chirp signals and instantaneous frequency/amplitude estimation

    Publication Year: 1996, Page(s):2948 - 2958
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (1088 KB)

    We present a time-varying coefficient difference equation representation for sinusoidal signals with time-varying amplitudes and frequencies. We first obtain a recursive equation for a single chirp signal. Then, using this result, we obtain time-varying coefficient difference equation representations for signals composed of multiple chirp signals. We analyze these equations using the skew-shift op... View full abstract»

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  • Optimal supports for linear predictive models

    Publication Year: 1996, Page(s):3150 - 3153
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract |PDF file iconPDF (448 KB)

    The problem of finding the optimal set of causal pixels (support) for use in linear predictive models is addressed. After presenting counterexamples to popular intuitions about supports, a general result relating the distortion incurred with a small support to optimal coefficients of a larger support is derived. A geometrical interpretation is provided. Two algorithms that optimally increase/decre... 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
Pier Luigi Dragotti
Imperial College London