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IEEE Signal Processing Letters

Issue 5 • Date May 2004

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Displaying Results 1 - 21 of 21
  • 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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  • Variation on variation on Euclid's algorithm

    Publication Year: 2004, Page(s):457 - 458
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (77 KB) | HTML iconHTML

    In a paper entitled "Variation on Euclid's Algorithm for Plynomials", Calvez et al. has shown that the extended Euclid's algorithm can be partially obtained by the nonextended one; in fact, it can obtain only two of the three unknowns of the Bezout's theorem. This letter goes further and shows that all polynomials given by the extended Euclid's algorithm and all the intermediate values can be obta... View full abstract»

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  • Split vector-radix-2/8 2-D fast Fourier transform

    Publication Year: 2004, Page(s):459 - 462
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (464 KB) | HTML iconHTML

    This letter presents an efficient split vector-radix-2/8 fast Fourier transform (FFT) algorithm. The split vector-radix-2/8 FFT algorithm saves 14% real multiplications and has much lower arithmetic complexity than the split vector-radix-2/4 FFT algorithm. Moreover, this algorithm reduces 25% data loads and stores compared with the split vector-radix-2/4 FFT algorithm. View full abstract»

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  • New distributed arithmetic algorithm for low-power FIR filter implementation

    Publication Year: 2004, Page(s):463 - 466
    Cited by:  Papers (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (240 KB) | HTML iconHTML

    This letter proposes a new distributed arithmetic (DA) algorithm for low-power finite-impulse response (FIR) filter implementation. The characteristic of the proposed algorithm is that the FIR filters using the proposed algorithm do not need to employ two's complement representation in lookup tables as well as multiply-and-accumulation blocks. Thus, the proposed algorithm can minimize the dynamic ... View full abstract»

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  • On passband criterion for eigenfilter design

    Publication Year: 2004, Page(s):467 - 469
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB) | HTML iconHTML

    In this letter, we propose a new passband criterion for eigenfilters. Instead of choosing the response at a particular frequency in the passband as the desired response, the new criterion chooses the average passband gain as the desired response. The new criterion does not increase the design cost. Simulations show that the proposed criterion leads to better filters both in least square sense and ... View full abstract»

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  • Identifiability issues in noisy ICA

    Publication Year: 2004, Page(s):470 - 473
    Cited by:  Papers (21)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB) | HTML iconHTML

    We consider the identifiability of the statistical model for noisy independent component analysis showing that while the mixing process is identifiable, the noise covariance is only partially so. This raises questions as to the performance of certain maximum-likelihood algorithms for blind source separation in the presence of noise. View full abstract»

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  • Competitive splitting for codebook initialization

    Publication Year: 2004, Page(s):474 - 477
    Cited by:  Papers (14)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB) | HTML iconHTML

    Codebook initialization usually has a significant effect on the performance of vector quantization algorithms. This letter presents a new scheme of codebook initialization in which the competitive learning and code vector splitting are incorporated together to produce a good initial codebook. Based mainly on the geometrical measurements of the learning tracks of the code vectors, the competitive s... View full abstract»

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  • Kernel-based nonlinear beamforming construction using orthogonal forward selection with the fisher ratio class separability measure

    Publication Year: 2004, Page(s):478 - 481
    Cited by:  Papers (17)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB) | HTML iconHTML

    This letter shows that the wireless communication system capacity is greatly enhanced by employing nonlinear beamforming and that the optimal Bayesian beamformer outperforms the standard linear beamformer significantly in terms of a reduced bit error rate, at a cost of increased complexity. A block-data adaptive implementation of the Bayesian beamformer is realized based on an orthogonal forward s... View full abstract»

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  • An efficient fixed-point implementation of residual resampling scheme for high-speed particle filters

    Publication Year: 2004, Page(s):482 - 485
    Cited by:  Papers (27)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (192 KB) | HTML iconHTML

    A novel low-complexity residual resampling scheme for particle filters is presented. The proposed scheme uses a simple but effective "particle-tagging" method to compensate for a possible error that can be caused by finite-precision quantization in the resampling step of particle filtering. The scheme guarantees that the number of particles after resampling is always equal to the number of particl... View full abstract»

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  • Sparse spike train deconvolution using the hunt filter and a thresholding method

    Publication Year: 2004, Page(s):486 - 489
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (200 KB) | HTML iconHTML

    A new deconvolution method of sparse spike trains is presented. It is based on the coupling of the Hunt filter with a thresholding. We show that a good model for the probability density function of the Hunt filter output is a Gaussian mixture, from which we derive the threshold that minimizes the probability of errors. Based on an interpretation of the method as a maximum a posteriori (MAP) estima... View full abstract»

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  • Cramer-Rao lower bound for estimating quadrupole resonance signals in non-Gaussian noise

    Publication Year: 2004, Page(s):490 - 493
    Cited by:  Papers (19)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB) | HTML iconHTML

    Quadrupole resonance (QR) technology for the detection of explosives is of crucial importance in an increasing number of applications. For landmine detection, where the detection system cannot be shielded, QR has proven to be highly effective if the QR sensor is not exposed to radio-frequency interference (RFI). However, strong non-Gaussian RFI in the field is unavoidable. A statistical model of s... View full abstract»

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  • Bifurcation analysis for third-order phase-locked loops

    Publication Year: 2004, Page(s):494 - 496
    Cited by:  Papers (18)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (88 KB) | HTML iconHTML

    Second-order phase-locked loops (PLLs) are extensively used in applications related to recovering clock signals for synchronous demodulation in telecommunication networks. In situations where an improvement of the transient response of the local clocks is necessary, third-order PLLs are employed. Here, we use concepts taken from dynamical system theory for analytically determining the capture rang... View full abstract»

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  • Time-varying multichirp rate modulation for multiple access systems

    Publication Year: 2004, Page(s):497 - 500
    Cited by:  Papers (11)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (216 KB) | HTML iconHTML

    We propose a modulation scheme that is based on wideband time-varying chirp signals for use in frequency-hopped code division multiple-access systems. The scheme is designed such that each user is assigned unique modulating chirp signals that efficiently occupy the hop bandwidth for identification at the receiver. We explain how the chirp modulation reduces multiple-access interference, and we dem... View full abstract»

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  • Source localization with isotropic arrays

    Publication Year: 2004, Page(s):501 - 504
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB) | HTML iconHTML

    We consider the effect of unknown signal propagation velocity on direction-of-arrival (DOA) estimation performance using an array of sensors. For general arrays, the DOA estimation variance, as measured by the Crame´r-Rao bound (CRB), degrades when the propagation velocity is unknown. In this letter, we show that for both two- and three-dimensional arrays, the CRB on the DOA angle is indepen... View full abstract»

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  • Improving DC coding models of JPEG arithmetic coder

    Publication Year: 2004, Page(s):505 - 508
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB) | HTML iconHTML

    While conducting experiments with JPEG binary arithmetic coding, we noticed that if a natural photographic image is rotated by 90° and then coded, the DC code size is reduced in general. This led us to investigate the discrete cosine transform and statistical models of JPEG arithmetic coder, and formulate two modifications to DC coefficient coding. We propose that the DC of a block should be p... View full abstract»

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  • Nonefficiency of stochastic beamforming bearing estimates at high SNR and finite number of samples

    Publication Year: 2004, Page(s):509 - 512
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (176 KB) | HTML iconHTML

    It is well known that the stochastic maximum-likelihood (SML) method yields Gaussian and efficient estimates when the number of independent identically distributed samples tends to infinity. This letter investigates the behavior of SML bearing estimation for a single source impinging on an antenna array when the SNR tends to infinity for a fixed number of samples. We prove that, rather surprisingl... View full abstract»

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  • Direct position determination of narrowband radio frequency transmitters

    Publication Year: 2004, Page(s):513 - 516
    Cited by:  Papers (82)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (184 KB) | HTML iconHTML

    The most common methods for location of communications or radar transmitters are based on measuring a specified parameter such as signal angle of arrival (AOA) or time of arrival (TOA). The measured parameters are then used to estimate the transmitter location. Since the AOA/TOA measurements are done at each base station separately, without using the constraint that all measurements must correspon... View full abstract»

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  • Cepstral domain segmental nonlinear feature transformations for robust speech recognition

    Publication Year: 2004, Page(s):517 - 520
    Cited by:  Papers (26)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (144 KB) | HTML iconHTML

    This letter presents a new segmental nonlinear feature normalization algorithm to improve the robustness of speech recognition systems against variations of the acoustic environment. An experimental study of the best delay-performance tradeoff is conducted within the AURORA-2 framework, and a comparison with two commonly used normalization algorithms is presented. Computationally efficient algorit... View full abstract»

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  • An interference-suppressing RAKE receiver for the CDMA downlink

    Publication Year: 2004, Page(s):521 - 524
    Cited by:  Papers (7)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (152 KB) | HTML iconHTML

    In this letter, we propose an interference-suppressing RAKE receiver for the code division multiple-access (CDMA) downlink. In the downlink, the received signal has a special structure that makes it possible for a RAKE receiver (which is a simple low-complexity linear receiver) with appropriately chosen weights to suppress interference efficiently. While there have been a few other interference-su... View full abstract»

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  • IEEE Signal Processing Society Information

    Publication Year: 2004, Page(s): c3
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    Freely Available from IEEE

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