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IEEE Signal Processing Letters

Issue 6 • June 2007

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  • Table of contents

    Publication Year: 2007, Page(s):C1 - C4
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  • IEEE Signal Processing Letters publication information

    Publication Year: 2007, Page(s): C2
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  • Electrocardiogram Compression Method Based on the Adaptive Wavelet Coefficients Quantization Combined to a Modified Two-Role Encoder

    Publication Year: 2007, Page(s):373 - 376
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (131 KB) | HTML iconHTML

    An effective method for electrocardiogram (ECG) compression is proposed. It is based on the pyramidal digital wavelet transform. The resulting wavelet coefficients are thresholded iteratively until a user-specified percentage root-mean-square difference is matched. In the next step, the nonzero coefficients of the thresholded vector are quantized adaptively by the linear quantizer of the lowest po... View full abstract»

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  • Outage analysis and optimal power allocation for multinode relay networks

    Publication Year: 2007, Page(s):377 - 380
    Cited by:  Papers (118)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (223 KB) | HTML iconHTML

    In this letter, a novel approach for outage probability analysis of the multinode amplify-and-forward relay network is provided. It is shown that the harmonic mean of two exponential random variables can be approximated, at high signal-to-noise ratio (SNR), to be an exponential random variable. The single relay case considered before is a special case of our analysis. Based on that approximation, ... View full abstract»

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  • TSK Fuzzy Approach to Channel Estimation for MIMO-OFDM Systems

    Publication Year: 2007, Page(s):381 - 384
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (244 KB) | HTML iconHTML

    This paper proposes a Takagi-Sugeno-Kang (TSK) fuzzy approach to channel estimation for multiple-input multiple-output orthogonal frequency division multiplexing systems. The information of dispersive fading channel is described by using the TSK fuzzy model, which is updated by using the decision feedback symbol or the scattered pilot symbol. Space-time block coding is used to get the diversity ga... View full abstract»

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  • A New Channel Estimation Using Data-Dependent Pilot Symbols for MC-CDMA Systems With Chip Interleaving

    Publication Year: 2007, Page(s):385 - 388
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (441 KB) | HTML iconHTML

    We propose a new channel-estimation method in a multicarrier-code division multiple access system with chip interleaving. This new method works with code-multiplexed pilot channels and data-dependent pilot symbols, where the reliability of the estimated channel gain is increased by the noise averaging effect. Simulation results show that the performance of the proposed method is comparable to the ... View full abstract»

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  • On the Optimization of Oversampled DFT Filter Banks

    Publication Year: 2007, Page(s):389 - 392
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (427 KB) | HTML iconHTML

    We use the general formula of the synthesis window of the oversampled discrete Fourier transform filter bank in terms of the minimum-norm solution and the null space of the perfect reconstruction condition matrix to optimize the window design. We give closed-form solutions to different optimization criteria, e.g., minimum out-of-band power, minimum quantization-error, and minimum window order View full abstract»

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  • An Efficient Implementation of a Robust Phase-Unwrapping Algorithm

    Publication Year: 2007, Page(s):393 - 396
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (191 KB) | HTML iconHTML

    A robust phase-unwrapping algorithm has been recently proposed and applied to accurately locate fast moving targets in multifrequency antenna array synthetic aperture radar imaging. This algorithm is based on two dimensional (2-D) searching and its complexity may be high. In this letter, we propose an efficient implementation of the robust phase-unwrapping algorithm. We show that the range of the ... View full abstract»

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  • An Efficient Color-Impulse Detector and its Application to Color Images

    Publication Year: 2007, Page(s):397 - 400
    Cited by:  Papers (24)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (583 KB) | HTML iconHTML

    By analyzing quaternion rotation theory, the color difference between two color pixels can be represented in quaternion form. Based on this representation of color difference, an efficient color-impulse detector for switching vector median filters is presented. Extensive simulations indicate that the proposed algorithm provides a significant improvement over many of the existing vector filtering t... View full abstract»

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  • Image Restoration Under Significant Additive Noise

    Publication Year: 2007, Page(s):401 - 404
    Cited by:  Papers (15)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (2653 KB) | HTML iconHTML

    The task of deblurring, a form of image restoration, is to recover an image from its blurred version. Whereas most existing methods assume a small amount of additive noise, image restoration under significant additive noise remains an interesting research problem. We describe two techniques to improve the noise handling characteristics of a recently proposed variational framework for semi-blind im... View full abstract»

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  • Video Textures Fractal Modeling

    Publication Year: 2007, Page(s):405 - 408
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1322 KB) | HTML iconHTML

    In this paper we propose a new method for natural video textures synthesis, using a three-dimensional (3-D) extended self-similar (ESS) fractal model. The autocorrelation functions (ACFs) of original texture increments are estimated, and a synthetic 3-D-ESS process whose increments have the same ACFs of the corresponding given ones is generated using a 3-D incremental Fourier synthesis algorithm. ... View full abstract»

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  • Near-Field Source Localization via Symmetric Subarrays

    Publication Year: 2007, Page(s):409 - 412
    Cited by:  Papers (47)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (322 KB) | HTML iconHTML

    We propose a near-field source localization algorithm with one-dimensional (1-D) search via symmetric subarrays. By dividing the uniform linear array (ULA) into two symmetric subarrays, the steering vectors of the subarrays yield the 1-D (only bearing-related) property of rotational invariance in signal subspace, which allows for the bearing estimation using the generalized far-field ESPRIT. With ... View full abstract»

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  • Metadata in Sequential Real-Time 2-D Detection

    Publication Year: 2007, Page(s):413 - 416
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (362 KB) | HTML iconHTML

    Extraction of patterns is an important low-level operation in several vision applications. In particular, this work is motivated by the problem of detecting unknown vague structures in images with a minimum sample number. Tracing of an unknown structure is allowed by the spatial 2-D placement of extremum. Often, this permits near-optimum testing of hypothesis, which also accentuates the descriptiv... View full abstract»

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  • Cramér–Rao-Induced Bound for Blind Separation of Stationary Parametric Gaussian Sources

    Publication Year: 2007, Page(s):417 - 420
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB) | HTML iconHTML

    The performance of blind source separation algorithms is commonly measured by the output interference-to-signal ratio (ISR). In this paper, we derive an asymptotic bound on the attainable ISR for the case of Gaussian parametric auto-regressive (AR), moving-average (MA), or auto-regressive moving-average (ARMA) processes. Our bound is induced by the Crameacuter-Rao bound on estimation of the mixing... View full abstract»

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  • Central Difference Formulation of Risk-Sensitive Filter

    Publication Year: 2007, Page(s):421 - 424
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (127 KB) | HTML iconHTML

    A numerically efficient algorithm for risk-sensitive filters (known to be robust to model uncertainties) of nonlinear plants, using central difference approximation is proposed. The proposed filter, termed central difference risk-sensitive filter (CDRSF), overcomes several disadvantages associated with the extended risk-sensitive filter (ERSF), reported earlier. The theory of formulation and the a... View full abstract»

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  • First- and Second-Order Moments of the Normalized Sample Covariance Matrix of Spherically Invariant Random Vectors

    Publication Year: 2007, Page(s):425 - 428
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (151 KB) | HTML iconHTML

    Under Gaussian assumptions, the sample covariance matrix (SCM) is encountered in many covariance based processing algorithms. In case of impulsive noise, this estimate is no more appropriate. This is the reason why when the noise is modeled by spherically invariant random vectors (SIRV), a natural extension of the SCM is extensively used in the literature: the well-known normalized sample covarian... View full abstract»

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  • IEEE Signal Processing Letters Information for authors

    Publication Year: 2007, Page(s):429 - 430
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  • 2008 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

    Publication Year: 2007, Page(s): 431
    Request permission for commercial reuse | PDF file iconPDF (573 KB)
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  • 2008 IEEE International Symposium on Circuits and Systems-engineering the environmental revolution (ISCAS 2008)

    Publication Year: 2007, Page(s): 432
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  • IEEE Signal Processing Society Information

    Publication Year: 2007, Page(s): C3
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Aims & Scope

The IEEE Signal Processing Letters is a monthly, archival publication designed to provide rapid dissemination of original, cutting-edge ideas and timely, significant contributions in signal, image, speech, language and audio processing.

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Meet Our Editors

Editor-in-Chief
Peter Willett
University of Connecticut
Storrs, CT 06269
peter.willett@uconn.edu