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IEEE Signal Processing Letters

Issue 11 • Nov. 2004

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  • Table of contents

    Publication Year: 2004, Page(s):c1 - c4
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  • IEEE Signal Processing Letters publication information

    Publication Year: 2004, Page(s): c2
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  • Filtered-X affine projection algorithm for multichannel active noise control using second-order Volterra filters

    Publication Year: 2004, Page(s):853 - 857
    Cited by:  Papers (34)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB) | HTML iconHTML

    A multichannel controller based on Volterra filters is described. A filtered-X affine projection algorithm is derived in detail for homogeneous quadratic filters. The proposed algorithm can be also extended to higher-order Volterra kernels and includes linear controllers as a particular case. View full abstract»

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  • Optimum decision delay of the finite-length DFE

    Publication Year: 2004, Page(s):858 - 861
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB) | HTML iconHTML

    This work investigates the optimum decision delay and tap-length of the finite-length decision feedback equalizer. First we show that, if the feedback filter (FBF) length Nb is equal to or larger than the channel memory v and the decision delay Δ is smaller than the feedforward filter (FFF) length Nf, then only the first Δ+1 elements of the FFF can be nonzero. Bas... View full abstract»

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  • Properties of the singular value decomposition for efficient data clustering

    Publication Year: 2004, Page(s):862 - 866
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB) | HTML iconHTML

    We introduce some interesting properties of the singular value decomposition (SVD), and illustrate how they may be used in conjunction with the k-means algorithm for efficiently clustering a set of vectors. Specifically, we use the SVD to preprocess and sort the data vectors, and then use the k-means algorithm on the modified vectors. To illustrate the effectiveness of this approach, we compare it... View full abstract»

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  • On the minimax design of passband linear-phase variable digital filters using semidefinite programming

    Publication Year: 2004, Page(s):867 - 870
    Cited by:  Papers (10)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (368 KB) | HTML iconHTML

    Variable digital filters (VDFs) are useful to the implementation of digital receivers because its frequency characteristics such as fractional delays and cutoff frequencies can be varied online. It is shown that the optimal minimax design of VDFs with passband linear-phase can be formulated and solved as a semi-definite programming (SDP) problem, which is a powerful convex optimization method. In ... View full abstract»

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  • Accelerated iterative band-limited extrapolation algorithms

    Publication Year: 2004, Page(s):871 - 874
    Cited by:  Papers (9)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    The iterative algorithms of Papoulis-Gerchberg and Cadzow are well-known algorithms for solving the band-limited extrapolation problem. These algorithms, however, are usually slowly convergent. We propose an acceleration scheme for both algorithms, based on finding best approximation in appropriate subspaces. The acceleration scheme can also be applied to other cases of signal restoration, which a... View full abstract»

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  • Cramer-Rao lower bound for constrained complex parameters

    Publication Year: 2004, Page(s):875 - 878
    Cited by:  Papers (20)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    An expression for the Cramer-Rao lower bound (CRB) on the covariance of unbiased estimators of a constrained complex parameter vector is derived. The application and usefulness of the result is demonstrated through its use in the context of a semiblind channel estimation problem. View full abstract»

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  • Moments of multidimensional polynomial FT

    Publication Year: 2004, Page(s):879 - 882
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (168 KB) | HTML iconHTML

    Moments of the second order polynomial Fourier transform are considered. Relations between moments for various parameters in the polynomial FT are established. Estimation of multidimensional FM signals parameters based on the moments is proposed and compared with the phase derivative based estimator. Implementation issues of the proposed estimator are discussed. View full abstract»

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  • Approximation of matrices by Gabor multipliers

    Publication Year: 2004, Page(s):883 - 886
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB) | HTML iconHTML

    We present a fast Fourier transform based algorithm which allows to obtain the best approximation of a given time-variant linear system by approximating its matrix (in the Hilbert-Schmidt sense) by a Gabor multiplier, using a given tight Gabor frame. We illustrate the approach by approximating the inverse of a slowly time variant filter. View full abstract»

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  • PAPR reduction of OFDM signals using a reduced complexity PTS technique

    Publication Year: 2004, Page(s):887 - 890
    Cited by:  Papers (145)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    A major drawback of orthogonal frequency division multiplexing (OFDM) is the high peak-to-average power ratio (PAPR) of the transmitted signal. Partial transmit sequence (PTS) technique can improve the PAPR statistics of OFDM signals. In the PTS technique, the data block to be transmitted is partitioned into disjoint subblocks and the subblocks are combined using phase factors to minimize PAPR. As... View full abstract»

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  • An extending window MMSE turbo equalization algorithm

    Publication Year: 2004, Page(s):891 - 894
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (160 KB) | HTML iconHTML

    We present a modified turbo minimum mean-squared error (MMSE) equalization algorithm using an extending window approach. We show that the new method can achieve nearly the same performance and considerable cost reduction compared with a recently proposed sliding window MMSE equalization technique. View full abstract»

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  • Space-time trellis codes with linear transformation for fast fading channels

    Publication Year: 2004, Page(s):895 - 898
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (178 KB) | HTML iconHTML

    A space-time trellis code with linear transformation (STTC-LT) is presented. The upper bound on the pairwise error probability (PEP) is derived and a new design criterion is proposed. It is shown that the performance of STTC-LT over fast Rayleigh fading channels depends on the weighted square product distance (WSPD). Simulation results are provided for QPSK signal sets. They show that the proposed... View full abstract»

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  • Soft-input reconstruction of binary transmitted quantized overcomplete expansions

    Publication Year: 2004, Page(s):899 - 903
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    We propose a soft-decoding method for quantized overcomplete frame expansions that are binary transmitted through noisy channels. The frame expansions can be viewed as real-valued block codes that are directly applied to waveform signals prior to quantization. The explicit redundancy introduced in the continuous amplitude domain is exploited by the decoder in two stages. First, the index-based red... View full abstract»

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  • Multiplier-free bandpass channelizer for undersampled applications

    Publication Year: 2004, Page(s):904 - 907
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (248 KB) | HTML iconHTML

    Today, there is a strong motivation to increase the digital content of low-power wireless transceivers. Direct data conversion is often not possible, or practical, at high radio frequencies. In such instances, undersampling analog-to-digital converters (ADCs) are often used to alias information, residing above the ADC's Nyquist frequency, down to baseband as a set of nonoverlapping subbands. In th... View full abstract»

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  • A novel multiple description coding scheme compatible with the JPEG2000 decoder

    Publication Year: 2004, Page(s):908 - 911
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    We propose a novel technique to generate rate-distortion optimized multiple descriptions of images, exploiting the rate-allocation strategy embedded in the JPEG2000 encoder. The proposed scheme can be applied to any encoding algorithm, given that the rate allocation is based on code-block truncation. The method yields excellent performance in terms of both central and side distortion, outperformin... View full abstract»

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  • A region-of-interest method for texturally-rich document image coding

    Publication Year: 2004, Page(s):912 - 917
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1272 KB) | HTML iconHTML

    Region-of-interest (ROI) techniques are often utilized to improve coding for detailed regions in natural still-image coding standards such as JPEG2000 , but no specific method is stated for determining the ROI map. In this paper, an ROI-based method, in which rectangular regions are extracted using document image analysis (DIA), is proposed specifically for document image coding. These rectangular... View full abstract»

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  • IEEE Signal Processing Letters Information for authors

    Publication Year: 2004, Page(s):918 - 919
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  • 2005 IEEE Signal Processing Society membership application

    Publication Year: 2004, Page(s): 920
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  • IEEE Signal Processing Society Information

    Publication Year: 2004, 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