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IEEE Signal Processing Letters

Issue 4 • April 2004

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Displaying Results 1 - 18 of 18
  • Table of contents

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

    Publication Year: 2004, Page(s): c2
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  • Adaptive pulse optimization for improved sonar range accuracy

    Publication Year: 2004, Page(s):409 - 412
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB) | HTML iconHTML

    Using the theory of optimal receivers, the range accuracy of echolocating systems can be expressed as a function of pulse bandwidth and SNR through the well-known Woodward equation. That equation, however, was developed in the limit of very high SNRs and assumes that the correct peak of the cross-correlation function is known a priori. We show that for increasing levels of noise, the accuracy of t... View full abstract»

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  • Design of the observer feedback gain for two-dimensional discrete systems

    Publication Year: 2004, Page(s):413 - 415
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (84 KB) | HTML iconHTML

    An algorithm for the state observer design of two-dimensional (2D) linear shift-invariant systems is proposed. For the case of one-dimensional (1D) systems, the necessary and sufficient conditions have been established for the problem, and an analytical solution for the observer feedback gain is given by K. Ogata (see "Discrete-Tone Control Systems", Prentice-Hall, 1995). Based on the well-known 1... View full abstract»

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  • Estimating the Hurst index of a self-similar process via the crossing tree

    Publication Year: 2004, Page(s):416 - 419
    Cited by:  Papers (10)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    By considering the crossings of size 2n made by a continuous self-similar process, for n = ..., -1, 0, 1, ..., we build a tree of crossings that encodes the sample path. From the crossing tree, we obtain a test for self-similarity and an estimator for the Hurst index, H. The accuracy of the estimator is established theoretically and numerically, and a comparison study with three other e... View full abstract»

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  • On the necessity of Papoulis' result for multidimensional GSE

    Publication Year: 2004, Page(s):420 - 422
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB) | HTML iconHTML

    Papoulis' generalized sampling expansion (GSE) can be carried out if a set of linear equations has a solution. This enables the reconstruction of a signal from its filtered and downsampled versions. We show that the existence of this solution is also a necessary condition for the reconstruction of the signal from the available data. Special attention is given to the case of recurrent multidimensio... View full abstract»

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  • Binary array set having a cross-shaped zero-correlation zone

    Publication Year: 2004, Page(s):423 - 426
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    The letter introduces a new approach to the construction of a set of binary arrays having a zero-correlation zone (ZCZ). The proposed array set has a cross-shaped ZCZ and, thus, is 1.5 times wider than that of existing ZCZ arrays. The proposed array set can be constructed from an arbitrary Hadamard matrix. The proposed array can be used in applications such as arrays of sound sources, position det... View full abstract»

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  • A fast converging algorithm for network echo cancellation

    Publication Year: 2004, Page(s):427 - 430
    Cited by:  Papers (18)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    The letter presents a novel method for network echo cancellation, based on a combination of normalized least mean square (NLMS) and proportionate NLMS (PNLMS) adaptive filtering algorithms. First, based on a rough analysis of PNLMS adaptation, it is indicated why, after PNLMS initial fast convergence, it slows down. Then, the method used to overcome this deficiency is presented. Last, by showing s... View full abstract»

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  • A new fuzzy bandwidth carrier recovery system in GPS for robust phase tracking

    Publication Year: 2004, Page(s):431 - 434
    Cited by:  Papers (4)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB) | HTML iconHTML

    Fast carrier recovery loops are essential in high-dynamic global positioning system receivers. A new digital phase-locked loop (DPLL) system incorporating a fuzzy bandwidth controller (FBC) is presented in this letter. The FBC provides a time-varying bandwidth and adjusts the loop filter coefficients to improve DPLL tracking capability. When the phase error or phase difference error becomes large ... View full abstract»

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  • A note on perfect arrays

    Publication Year: 2004, Page(s):435 - 438
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    We give some new methods for constructing perfect arrays. Some results on the liftability of the perfect ternary sequences are obtained. In addition, we present a new perfect ternary array with index group Z2r. View full abstract»

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  • Structures of space-time codes and multipath MIMO channels

    Publication Year: 2004, Page(s):439 - 442
    Cited by:  Papers (2)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (296 KB) | HTML iconHTML

    In a wireless system with multipath multiple-input multiple-output (MIMO) channels using antenna arrays, the delay spread of the multipaths results in intersymbol interference (ISI) and channel frequency selectivity. In contrast with the channel frequency selectivity, spatial gains at the multipath angles also naturally result in channel angle selectivity. Based on the channel selectivity structur... View full abstract»

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  • Design of optimal camera apertures adapted to display devices over arbitrary sampling lattices

    Publication Year: 2004, Page(s):443 - 445
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB) | HTML iconHTML

    We show how to design an optimal camera aperture for a given display aperture defined on an arbitrary spatial or spatio-temporal sampling lattice. This is achieved by determining the reciprocal Riesz basis for the vector space of displayed images. The result can be used to specify ideal virtual cameras for a number of applications such as regularized image up-sampling. A case study for displaying ... View full abstract»

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  • Cryptanalysis of correlation-based watermarking schemes using single watermarked copy

    Publication Year: 2004, Page(s):446 - 449
    Cited by:  Papers (12)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB) | HTML iconHTML

    Most of the existing digital watermarking techniques are based on correlation between "some information stored in the watermarked copy" and "related information retrieved from attacked watermarked copy". We show how to remove this correlation to mount a ciphertext-only cryptanalytic attack on these watermarking schemes. The attack needs only a single watermarked copy of the image. Our work clearly... View full abstract»

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  • A modified a priori SNR for speech enhancement using spectral subtraction rules

    Publication Year: 2004, Page(s):450 - 453
    Cited by:  Papers (34)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (232 KB) | HTML iconHTML

    The letter addresses the problem of single-channel speech enhancement using a spectral subtraction method. The proposed approach is directed toward finding a self-adaptive averaging factor to estimate the a priori SNR. Performance of the modified averaging factor is evaluated using conventional spectral-subtraction algorithms in which the averaging factor is otherwise kept as a constant. Improved ... View full abstract»

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  • Comments on "New algorithm for array pattern synthesis using the recursive least squares method"

    Publication Year: 2004
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (23 KB) | HTML iconHTML

    For original paper by Wang et al., see IEEE Signal Processing Lett., vol.10, p.235-8 (2003 August). View full abstract»

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  • IEEE Signal Processing Letters Information for authors

    Publication Year: 2004, Page(s):455 - 456
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  • IEEE Signal Processing Society Information

    Publication Year: 2004, Page(s): c3
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  • Blank page [back cover]

    Publication Year: 2004, Page(s): c4
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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.

Full Aims & Scope

Meet Our Editors

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