Volume 12 Issue 1 • Jan. 2005

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Displaying Results 1 - 25 of 27
  • Table of contents

    Publication Year: 2005, Page(s):c1 - c4
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  • IEEE Signal Processing Letters publication information

    Publication Year: 2005, Page(s): c2
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  • Power efficient structure for conversion between arbitrary sampling rates

    Publication Year: 2005, Page(s):1 - 4
    Cited by:  Papers (27)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (211 KB) | HTML iconHTML

    This work presents a novel efficient method for conversion between arbitrary sampling rates. The method allows arbitrary number of zeros at multiples of both input and output sampling rates, thus it has both good anti-imaging and good anti-aliasing properties. Further, two equivalent efficient implementation structures are presented. The implementation is done either by using the modified Farrow o... View full abstract»

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  • The frequency transformation by matrix operation and its application in IIR filters design

    Publication Year: 2005, Page(s):5 - 8
    Cited by:  Papers (10)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (140 KB) | HTML iconHTML

    It is known that the transfer function H(z) of the desired digital infinite-impulse response filter can be obtained from the normalized transfer function H/sub a/(s) of the analog low-pass filter. Recently it has been shown that Pascal matrix allows the appropriate transformation for design of the low-pass, high-pass, and bandpass digital filters. Unfortunately, this method is difficult to use in ... View full abstract»

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  • Neural least-squares design of higher order digital differentiators

    Publication Year: 2005, Page(s):9 - 12
    Cited by:  Papers (12)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (148 KB) | HTML iconHTML

    The least-squares (LS) design of higher order digital differentiators can be formulated as to solve a system of linear equations. This is completed by solving a matrix inversion or by using some matrix properties to simplify the optimization. Here, a Hopfield neural network (NN) with closed-form evaluation for the related parameters is utilized to solve the mentioned set of linear equations in rea... View full abstract»

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  • CFAR strategies for channelized radiometer

    Publication Year: 2005, Page(s):13 - 16
    Cited by:  Papers (35)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (188 KB) | HTML iconHTML

    The channelized radiometer is a well-known intercept receiver. We analyze its performance when different constant false alarm rate (CFAR) strategies are used to set a detection threshold based on values of some reference cells. The studied conventional methods are cell-averaging (CA) and order statistics. The proposed iterative methods for setting the detection threshold are forward consecutive me... View full abstract»

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  • Image denoising using bivariate α-stable distributions in the complex wavelet domain

    Publication Year: 2005, Page(s):17 - 20
    Cited by:  Papers (91)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (532 KB) | HTML iconHTML

    Recently, the dual-tree complex wavelet transform has been proposed as an analysis tool featuring near shift-invariance and improved directional selectivity compared to the standard wavelet transform. Within this framework, we describe a novel technique for removing noise from digital images. We design a bivariate maximum a posteriori estimator, which relies on the family of isotropic α-stable dis... View full abstract»

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  • A sequential algorithm for robust parameter estimation

    Publication Year: 2005, Page(s):21 - 24
    Cited by:  Papers (9)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (169 KB) | HTML iconHTML

    A sequential M-estimation algorithm is proposed as an alternative to sequential least squares (LS). Being an approximation to exact M-estimation, the proposed technique is robust to non-Gaussian noise and outperforms sequential LS. A low-cost technique is introduced for initialization. We also show that sequential LS is a special case of the proposed algorithm. View full abstract»

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  • Beyond standard classes of generalized joint signal representations of arbitrary variables: Mercer kernel-based representations

    Publication Year: 2005, Page(s):25 - 28
    Cited by:  Papers (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (168 KB) | HTML iconHTML

    We present an approach for extending the scope of standard covariant signal representations by means of implicit nonlinear mappings applied to signals via Mercer kernels. One of the advantages of using such kernels is that we do not need to exhibit the underlying nonlinear maps to be able to compute signal representations. This gives increased computational efficiency. Finally, conditions on kerne... View full abstract»

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  • Application of the convergence of the control points of B-splines to wavelet decomposition at rational scales and rational location

    Publication Year: 2005, Page(s):29 - 32
    Cited by:  Papers (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (169 KB) | HTML iconHTML

    We first recall the relation between discrete B-splines and the control points of B-splines. We then use some convergence properties of the control points of B-splines to derive a new algorithm that approximates the wavelet decomposition at rational scales and rational location. We conclude the paper by some numerical experiments illustrating the behavior of our algorithm and by a discussion on an... View full abstract»

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  • Boundary Processing of bidimensional EMD using texture synthesis

    Publication Year: 2005, Page(s):33 - 36
    Cited by:  Papers (54)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (885 KB) | HTML iconHTML

    A novel boundary processing technique is proposed for bidimensional empirical mode decomposition (BEMD). BEMD is a new form of multiscale decomposition and has superior quality in extracting intrinsic components of textures. Although the boundary effect of BEMD is one of its main questions, there have been no concrete discussions or effective methods for it. A modified algorithm of nonparametric s... View full abstract»

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  • Minimum entropy time-frequency distributions

    Publication Year: 2005, Page(s):37 - 40
    Cited by:  Papers (34)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (164 KB) | HTML iconHTML

    Re/spl acute/nyi entropy has been proposed as an effective measure of signal information content and complexity on the time-frequency plane. The previous work concerning Re/spl acute/nyi entropy in the time-frequency plane has focused on measuring the complexity of a given deterministic signal. In this paper, the properties of Re/spl acute/nyi entropy for random signals are examined. The upper and... View full abstract»

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  • A new approach for fast generalized sphere decoding in MIMO systems

    Publication Year: 2005, Page(s):41 - 44
    Cited by:  Papers (36)  |  Patents (2)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (163 KB) | HTML iconHTML

    A new generalized sphere decoder (GSD), called a double-layer sphere decoder (DLSD), is proposed for under-determined MIMO systems with fewer receive antennas N than transmit antennas M. The proposed algorithm is significantly faster than those introduced in and . The basic idea is to partition the transmitted signal vector into two subvectors with M-N+1 and N-1 elements. After some simple transfo... View full abstract»

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  • Differential unitary space-time signal design using matrix rotation structure

    Publication Year: 2005, Page(s):45 - 48
    Cited by:  Papers (5)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (331 KB) | HTML iconHTML

    We consider the design of matrix rotation based space-time signals based on the design criterion of minimizing the union bound on block error probability. We further propose to design the signal parameters via noninteger searching to get better signals. Superior performance of our improved design over the previous design are demonstrated through numerical calculations and performance simulations. ... View full abstract»

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  • Transform-selective interference suppression algorithm for spread-spectrum communications

    Publication Year: 2005, Page(s):49 - 51
    Cited by:  Papers (12)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (120 KB) | HTML iconHTML

    An adaptive method for suppressing interference with an unknown model is presented. The method is based on computation of several transforms in parallel and selecting the most suitable one depending on a priori unknown the interference type based on a compression gain (CG) metric, which is related to the interference concentration in the transform domain. It is also possible to estimate the a prio... View full abstract»

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  • Improving channel estimation in OFDM systems for sparse multipath channels

    Publication Year: 2005, Page(s):52 - 55
    Cited by:  Papers (92)  |  Patents (1)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (178 KB) | HTML iconHTML

    We describe an algorithm for sparse channel estimation applicable to orthogonal frequency division multiplexing systems. The proposed algorithm uses a least squares (LS) technique for channel estimation and a generalized Akaike information criterion to estimate the channel length and tap positions. This effectively reduces the signal space of the LS estimator, and hence improves the estimation per... View full abstract»

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  • Pilot cyclic prefixed single carrier communication: channel estimation and equalization

    Publication Year: 2005, Page(s):56 - 59
    Cited by:  Papers (47)  |  Patents (4)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (308 KB) | HTML iconHTML

    Cyclic prefixed single carrier (CP-SC) has emerged as a promising technique for wideband wireless communication. The cyclic prefix (CP) in CP-SC costs some bandwidth, but it cannot be used for channel estimation in fast-variant channel environment. In this letter, a new scheme is proposed for CP-SC which not only adds a CP but also a suffix. With the aid of the CP and suffix, channel responses can... View full abstract»

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  • Performance analysis of channel estimation in OFDM systems

    Publication Year: 2005, Page(s):60 - 62
    Cited by:  Papers (49)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (130 KB) | HTML iconHTML

    We investigate an analysis of channel estimation using an interpolation technique in orthogonal frequency division multiplexing systems. Then a criterion for the adaptive interval of pilot subcarriers is derived. The mean-square error (mse) of comb-type estimators is dominated by the length of channel delay and the interval of pilot subcarriers. Analysis shows that the mse performance of comb-type... View full abstract»

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  • Impulsive noise removal using threshold Boolean filtering based on the impulse detecting functions

    Publication Year: 2005, Page(s):63 - 66
    Cited by:  Papers (44)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (801 KB) | HTML iconHTML

    A filter for impulsive noise removal is presented here. The problem of impulsive noise elimination is closely connected with the problem of maximal preservation of image edges. To avoid smoothing of the image during filtering, all noisy pixels must be detected. We consider here an approach, which is based on threshold Boolean filtering, where the binary slices of an image, obtained by the threshol... View full abstract»

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  • Steganography using multiple-base notational system and human vision sensitivity

    Publication Year: 2005, Page(s):67 - 70
    Cited by:  Papers (86)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (810 KB) | HTML iconHTML

    This letter proposes a novel steganographic scheme that employs human vision sensitivity to hide a large amount of secret bits into a still image with a high imperceptibility. In this method, data to be embedded are converted into a series of symbols in a notation system with multiple bases. The specific bases used are determined by the degree of local variation of the pixel magnitudes in the host... View full abstract»

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  • Daytime interference nulling of OSMAR

    Publication Year: 2005, Page(s):71 - 74
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (147 KB) | HTML iconHTML

    In order to cancel the daytime interference of Ocean State Monitoring and Analyzing Radar, which appears in some consecutive days, we analyze the interference characteristic. Based on the characteristic the sidelobe cancellation technique and the orthogonal expansion method are proposed to cancel the interference. Both methods increase the sea-echo-to-interference ratio, but the latter achieves be... View full abstract»

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  • A fast adaptive-codebook search algorithm for G.723.1 speech coder

    Publication Year: 2005, Page(s):75 - 78
    Cited by:  Papers (6)
    Request permission for reuse | Click to expandAbstract | PDF file iconPDF (198 KB) | HTML iconHTML

    This letter presents a new fast search algorithm for the multitap adaptive codebook used in the G.723.1 standard speech coder. In contrast with the standard method that a closed-loop pitch lag and gains for a fifth-order pitch predictor are searched simultaneously, the proposed algorithm adopts a sequential and restricted approach to determine the parameters. In other words, the proposed scheme fi... View full abstract»

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  • IEEE Signal Processing Letters Information for authors

    Publication Year: 2005, Page(s):79 - 80
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  • Special issue on genomic signal processing

    Publication Year: 2005, Page(s): 81
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  • Special issue on statistical and perceptual audio processing

    Publication Year: 2005, Page(s): 82
    Request permission for reuse | PDF file iconPDF (116 KB)
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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
James E. Fowler
Dept Electrical & Computer Engineering
Associate Director                         
Distributed Analytics and Security Institute
Mississippi State University
Mississippi State, MS 39762 USA
fowler@ece.msstate.edu