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IEEE Signal Processing Letters

Issue 7 • Date July 2007

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Displaying Results 1 - 25 of 25
  • 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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  • Row-Column Soft-Decision Feedback Algorithm for Two-Dimensional Intersymbol Interference

    Publication Year: 2007, Page(s):433 - 436
    Cited by:  Papers (29)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (586 KB) | HTML iconHTML

    We present a novel iterative row-column soft decision feedback algorithm (IRCSDFA) for detection of binary images corrupted by 2-D intersymbol interference and additive white Gaussian noise. The algorithm exchanges weighted soft information between row and column maximum a posteriori (MAP) detectors. Each MAP detector exploits soft-decision feedback from previously processed rows or columns... View full abstract»

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  • An FFT-Based Method for Blind Identification of FIR SIMO Channels

    Publication Year: 2007, Page(s):437 - 440
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (127 KB) | HTML iconHTML

    This letter develops a fast Fourier transform (FFT)-based method for estimating the impulse response of FIR single-input multiple-output (SIMO) channels driven by an unknown deterministic signal. The proposed algorithm successfully handles very short data sequences, for which the existing second-order statistics based methods, e.g., the subspace (SS), cross-relation (CR), and shifted correlation (... View full abstract»

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  • Rate-Maximizing Multiuser Scheduling for Parallel Channel Access

    Publication Year: 2007, Page(s):441 - 444
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (179 KB) | HTML iconHTML

    Optimal multiuser scheduling which maximizes the sum rate for parallel channel access often involves an NP-hard design problem. In this letter, we propose a low-complexity optimal solution using a two-step procedure: (1) generalized selection multiuser diversity (GSMuD) which ranks the channels of a total of users and selects the users with the largest signal-to-noise ratios (SNRs) for channel acc... View full abstract»

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  • Convolution Using Discrete Sine and Cosine Transforms

    Publication Year: 2007, Page(s):445 - 448
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (130 KB) | HTML iconHTML

    In this paper, we derive a relation for the circular convolution operation in the discrete sine and cosine transform domains. The transform coefficients are either symmetric or asymmetric and hence we need to calculate only half of the total coefficients. Since fast algorithms are available for the computation of discrete sine and cosine transforms, the proposed method is an alternative to the dis... View full abstract»

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  • Image Registration Using Blur-Invariant Phase Correlation

    Publication Year: 2007, Page(s):449 - 452
    Cited by:  Papers (24)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1148 KB) | HTML iconHTML

    In this paper, we propose an image registration method, which is invariant to centrally symmetric blur. The method utilizes the phase of the images and has its roots on phase correlation (PC) registration. We show how the even powers of the normalized Fourier transform of an image are invariant to centrally symmetric blur, such as motion or out-of-focus blur. We then use these results to propose b... View full abstract»

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  • Importance Sampling Kalman Filter for Image Estimation

    Publication Year: 2007, Page(s):453 - 456
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1524 KB) | HTML iconHTML

    This paper presents discontinuity adaptive image estimation within the Kalman filter framework by non-Gaussian modeling of the image prior. A generalized methodology is proposed for specifying state-dynamics using the conditional density of the state given its neighbors, without explicitly defining the state equation. The novelty of our approach lies in directly obtaining the predicted mean and va... View full abstract»

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  • A Two-Dimensional Extension of the Mueller and Müller Timing Error Detector

    Publication Year: 2007, Page(s):457 - 460
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (223 KB) | HTML iconHTML

    We present a 2-D extension of a timing error detector (TED) originally developed by Mueller and Muller for timing recovery on multilevel pulse amplitude modulation (PAM) over 1-D channels. We provide accurate theoretical expressions of the performance of the proposed scheme, and we verify its applicability by studying a particular case. The 2-D TED thus obtained is used as the engine of a 2-D phas... View full abstract»

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  • Phase Distortion Estimation by DIRECT and Spline Interpolation Algorithms

    Publication Year: 2007, Page(s):461 - 464
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (197 KB) | HTML iconHTML

    An important cause of performance loss in source localization in underwater acoustics is that towed flexible antennas deviate from the assumed rectilinear shape. In this work, the localization of sources in presence of phase errors is studied. Cancellation of phase errors is necessary to solve the source-localization problem. A previous work led to interesting results for antennas composed of a fe... View full abstract»

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  • A Bayesian Robust Adaptive Beamforming Based on Phase-Invariant MMSE Criterion

    Publication Year: 2007, Page(s):465 - 468
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB) | HTML iconHTML

    The Bayesian beamformer under minimum mean square error (MMSE) criterion has been reported to perform well against uncertainty in source direction of arrival (DOA), but its performance depends on the location of phase reference. This letter proposes a phase-invariant MMSE criterion under which the Bayesian beamformer is independent of the location of phase reference. An iterative algorithm is deve... View full abstract»

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  • An Optimal Filtering Algorithm for Systems With Multiplicative/Additive Noises

    Publication Year: 2007, Page(s):469 - 472
    Cited by:  Papers (13)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (116 KB) | HTML iconHTML

    In this letter, we propose a new optimal filtering algorithm for systems with multiplicative noise process under correlated additive noises. Different from the traditional derivation method of constructing innovation process, we derive the new algorithm based on the well-known projection theorem, which is simple in principle, convenient for recursive estimation and flexible for application. The ne... View full abstract»

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  • A Shift Invariance-Based Order-Selection Technique for Exponential Data Modelling

    Publication Year: 2007, Page(s):473 - 476
    Cited by:  Papers (21)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (190 KB) | HTML iconHTML

    This paper presents a new subspace-based technique for automatic detection of the number of exponentially damped sinusoids. It consists in studying the shift-invariance of the dominant subspace of the Hankel data matrix. No threshold setting and no penalization terms are necessary. This model-based method, easy to implement, can be plugged into most subspace-based harmonic retrieval algorithms. View full abstract»

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  • Cramér-Rao Bound Conditioned by the Energy Detector

    Publication Year: 2007, Page(s):477 - 480
    Cited by:  Papers (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (147 KB) | HTML iconHTML

    A wide variety of processing incorporates a binary detection test that restricts the set of observations available for parameter estimation and requires to take this statistical conditioning into account to compute the Cramer-Rao bound (CRB). Therefore, we propose a derivation of the CRB for the deterministic signal model conditioned by the energy detector widely used in signal processing applicat... View full abstract»

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  • Determining Number of Speakers From Multispeaker Speech Signals Using Excitation Source Information

    Publication Year: 2007, Page(s):481 - 484
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (486 KB) | HTML iconHTML

    In this letter, we address the issue of determining the number of speakers from multispeaker speech signals collected simultaneously using a pair of spatially separated microphones. The spatial separation of the microphones results in time delay of arrival of speech signals from a given speaker. The differences in the time delays for different speakers are exploited to determine the number of spea... View full abstract»

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  • Convolutional Bias Removal Based on Normalizing the Filterbank Spectral Magnitude

    Publication Year: 2007, Page(s):485 - 488
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (134 KB) | HTML iconHTML

    In this letter, a novel convolutional bias removal technique is proposed. The proposed method is based on scaling the filterbank magnitude by the average of filterbank magnitude over time. The relation between the cepstral mean normalization (CMN) and proposed algorithm is derived. The experimental results show that the proposed algorithm is more robust than the CMN for both convolutional bias and... View full abstract»

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  • Noise-Robust Speech Recognition Using Top-Down Selective Attention With an HMM Classifier

    Publication Year: 2007, Page(s):489 - 491
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (115 KB) | HTML iconHTML

    For noise-robust speech recognition, we incorporated a top-down attention mechanism into a hidden Markov model classifier with Mel-frequency cepstral coefficient features. The attention filter was introduced at the outputs of the Mel-scale filterbank and adjusted to maximize the log-likelihood of the attended features with the attended class. A low-complexity constraint was proposed to prevent the... View full abstract»

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  • Feature Compensation Incorporating Modeling Error Statistics

    Publication Year: 2007, Page(s):492 - 495
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (136 KB) | HTML iconHTML

    In this letter, we propose a novel approach to feature compensation for robust speech recognition in noisy environments. We analyze the error distribution of speech corruption model in the log spectral domain and represent the statistics as functions with respect to the signal-to-noise ratio. The proposed algorithm incorporates modeling error statistics into the interacting multiple model techniqu... View full abstract»

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  • Linear Spectral Transformation for Robust Speech Recognition Using Maximum Mutual Information

    Publication Year: 2007, Page(s):496 - 499
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (111 KB) | HTML iconHTML

    This paper presents a transformation-based rapid adaptation technique for robust speech recognition using a linear spectral transformation (LST) and a maximum mutual information (MMI) criterion. Previously, a maximum likelihood linear spectral transformation (ML-LST) algorithm was proposed for fast adaptation in unknown environments. Since the MMI estimation method does not require evenly distribu... View full abstract»

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  • Temporal Structure Normalization of Speech Feature for Robust Speech Recognition

    Publication Year: 2007, Page(s):500 - 503
    Cited by:  Papers (22)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (218 KB) | HTML iconHTML

    This letter presents a new feature normalization technique to normalize the temporal structure of speech features. The temporal structure of the features is partially represented by its power spectral density (PSD). We observed that the PSD of the features varies with the corrupting noise and signal-to-noise ratio. To reduce the PSD variation due to noise, we propose to normalize the PSD of featur... View full abstract»

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  • IEEE Signal Processing Letters Information for authors

    Publication Year: 2007, Page(s):504 - 505
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  • 2008 IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP)

    Publication Year: 2007, Page(s): 506
    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): 507
    Request permission for commercial reuse | PDF file iconPDF (773 KB)
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  • Special issue on Statistical Methods for Network Security and Forensics

    Publication Year: 2007, Page(s): 508
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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.

Full Aims & Scope

Meet Our Editors

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