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62nd Vehicular Technology Conference, VTC 2005

作者： Herlekar, Sameer R. Wu, Hsiao-Chun Zhang, Chi Srivastava, Ashok Communications and Signal Processing Laboratory Department of Electrical and Computer Engineering Louisiana State University Baton RougeLA70803-5901 United States

ISBN: (纸本)0780391527

Phase noise may be regarded as the most severe cause of performance degradation in OFDM systems. Hot-carriers (HCs), found in the CMOS synchronization circuits, are highmobility charge carriers that degrade the MOSFET devices' performance by increasing the threshold voltage required to operate the MOSFETs. The HC effect manifests itself as the phase noise, which increases with the continued MOSFET operation and results in the performance degradation of the Voltage-Controlled Oscillator (VCO) built on the MOSFET. The HC effect is particularly evident in the short-channel MOSFET devices. The MOSFET instability will impact on the OFDM system performance. The relationship between the OFDM system performance and the hot-carrier effect can be analyzed in terms of a crucial parameter, the threshold voltage. In this paper, we adopt the phase noise model for double-ended ring oscillators, and derive a sensitivity function which can provide insights into the expected OFDM system performance for the system design engineers. The expected OFDM performance degradation due to the hot carrier effect is also provided through our simulations. © 2005 IEEE.

关键词： Phase noise

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Extracting the optic disk endpoints in optical coherence tomography data

Extracting the optic disk endpoints in optical coherence tom...

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7th IEEE Workshop on Applications of computer Vision, WACV 2005

作者： Herzog, Artemas Boyer, Kim L. Roberts, Cynthia Ohio State University Department of Electrical and Computer Engineering Signal Analysis and Machine Perception Laboratory United States Ohio State University Department of Ophthalmology Department of Biomedical Engineering United States

ISBN: (纸本)0769522718

Optical Coherence Tomography (OCT) uses backre-flected light to provide micron-resolution, cross-sectional scans of biological tissues useful in diagnosing, monitoring, and studying glaucoma. The ratio of the area of the central portion of the optic nerve (the cup) to that of the complete nerve (the disk) is an indicator of ocular health. Measuring this cup-to-disk ratio accurately requires precise detection of the cup and disk limits in scans traversing the optic nervehead. A hybrid edge-supported boundary detector first finds the contour separating the retina and optic nervehead (on one side) from the vitreous humor on the other. We then partition this boundary using a model-based technique to identify the optic cup. The lower retinal-choroid boundaries are extracted using Markov models first derived by Koozekanani et al.. The endpoints of these lower boundaries represent the limits of the optic disk. Points along the Markov path are then represented in a feature space comprising two low order unitary transform coefficients and a measure of differential edge strength. By minimizing the trace of the within-class scatter matrices for optic nerve and retina, optimal estimates of the nervehead extent are found. We present thorough experimental results to establish the stability and robustness of the technique, as well as its performance limitations.

关键词： Optical tomography

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A quantitative comparison of different mother wavelets for characterizing transients in power systems

A quantitative comparison of different mother wavelets for c...

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Canadian Conference on electrical and computer engineering 2005

作者： Safavian, L.S. Kinsner, W. Turanli, H. Department of Electrical and Computer Engineering Signal and Data Compression Laboratory University of Manitoba Winnipeg Man. R3T 5V6 Canada Manitoba Hydro Winnipeg Man. R3C 2P4 Canada

This paper presents a study of wavelet analysis of transients in power systems. Short-term and nonstationary nature of transients necessitates the use of advanced signal processing techniques in order to detect, characterize and classify them. The paper examines the fundamental properties of a number of mother wavelets, and provides guidelines for the selection of suitable wavelets for the purpose of characterization and extraction of features of transients in power systems. As an indispensable part of such a study, the paper also presents the results of wavelet analysis of typical types of transients obtained using simulation. © 2005 IEEE.

关键词： Wavelet transforms

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Aquantitative comparison of different mother wavelets for characterizing transients in power systems

Aquantitative comparison of different mother wavelets for ch...

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Canadian Conference on electrical and computer engineering (CCECE)

作者： L.S. Safavian W. Kinsner H. Turanli Department of Electrical and Computer Engineering Signal and Data Compression Laboratory University of Manitoba Winnipeg MAN Canada Manitoba Hydro Winnipeg MAN Canada

This paper presents a study of wavelet analysis of transients in power systems. Short-term and non-stationary nature of transients necessitates the use of advanced signal processing techniques in order to detect, characterize and classify them. The paper examines the fundamental properties of a number of mother wavelets, and provides guidelines for the selection of suitable wavelets for the purpose of characterization and extraction of features of transients in power systems. As an indispensable part of such a study, the paper also presents the results of wavelet analysis of typical types of transients obtained using simulation

关键词： Power system transients Transient analysis Wavelet analysis signal analysis Power system simulation Power system analysis computing Wavelet transforms signal processing Guidelines Feature extraction

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Hardware implementation issues of cascade filters MUD for multirate WCDMA systems

Hardware implementation issues of cascade filters MUD for mu...

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SiPS 2005: IEEE Workshop on signal Processing Systems - Design and Implementation

作者： Ho, Quoc-Thai Massicotte, Daniel Laboratory of Signal and System Integration Department of Electrical and Computer Engineering Université du Québec à Trois-Rivières Trois-Rivières Québec Canada

ISBN: (纸本)0780393341

The hardware implementation issues of multiuser interference cancellation techniques for multirate asynchronous Direct-Sequence Code Division Multi-Access (DS-CDMA) systems based on variable spreading factor (VSF) are investigated. Based on an algorithm for monorate systems based on Cascade Adaptive Filter Multi-User Detector (CF-MUD), an analysis is done to choose the best tradeoffs between hardware implementation and algorithmic performance in the third generation (3G) communication scenarios. We investigate two popular techniques, namely low-rate detector (LRD) and high-rate detector (HRD). The goal aims to extend the CF-MUD algorithm and reuse its FPGA-targeted architectures that we previously developed for multirate systems. The developed architectures can be used as an Intellectual Property (IP) core in a System on a Programmable Chip (SOPC) based on Xilinx© Virtex II Pro and Virtex II processing MUD function for asynchronous multirate systems. © 2005 IEEE.

关键词： Code division multiple access

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Feature selection: We've barely scratched the surface

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IEEE INTELLIGENT SYSTEMS 2005年第6期20卷 74-76页

作者： Forman, G Hewlett-Packard Labs. United States Arizona State University United States Department of Electrical Engineering United States Genomic Signal Processing Laboratory Texas A and M University United States Computational Biology Division Translational Genomics Resesarch Insititute Phoenix United States Department of Electrical and Computer Engineering Northeastern University United States Motorola Labs. Intel Genomics Division Lawrence Berkeley National Laboratory United States Lawrence Berkeley National Laboratory United States Life Science Division Lawrence Berkeley National Laboratory United States Neurogenomics Division Translational Genomics Research Institute United States Department of Computer Science and Engineering Fulton School of Engineering Arizona State University United States Department of Computer Science University of New York Binghamton United States Department of Computer Science and Engineering Arizona State University United States

Various feature selection techniques were studied. The trend toward richer data types is pushing feature selection in both scale and complexity. Natural language text features and image features are becoming commonplace. Several trends will increase the demand for feature selection. Time plays an additional role in some nonstationary domains where the best features have a seasonal dependency.

关键词： Feature extraction

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Comparison of entropy-based characterization of lightning strike maps using planar and spherical coordinates

Comparison of entropy-based characterization of lightning st...

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Canadian Conference on electrical and computer engineering (CCECE)

作者： A. Faghfouri W. Kinsner D. Swatek Department of Electrical and Computer Engineering Signal and Data Compression Laboratory University of Manitoba Winnipeg MAN Canada Insulation Engineering and Testing Department Manitoba Hydro Winnipeg MAN Canada

In this paper, effects of including the curvature of the Earth in the characterization of the lightning strike maps (LSMs) are studied. Lightning strikes can adversely affect the power generation and distribution systems, and behaviour prediction of such LSMs is of interest for protection and planning in the power industry. Characterization is one of the important stages of the behaviour prediction. We have shown that multifractal measures such as the Renyi fractal dimension spectrum (RS) are appropriate for characterization of such LSMs which are self-affine. The computation of the RS is based on estimating the probability density function (pdf) of the lightning strikes distribution. Since the LSMs range from very large to low densities over a large geographical area such as Manitoba, computing this pdf in planar coordinates is subject to a nonlinear error due to the curvature of the Earth. Thus, modelling and calculating the maps in spherical coordinates yields a better estimation of the pdf. The data of the LSMs have been collected by the Canadian Lightning Detection Network (CLDN) during the year 2002. The LSMs of Manitoba are characterized through regular (using planar coordinates) and modified (using spherical coordinates) RS techniques. The results indicate that regular RS technique alters the characteristics of the feature space, especially in latitudinal direction, and causes sparser features in the feature space, while using the modified RS technique alleviates all these problems, and provides a more accurate characterization which is necessary for a reliable classification of the maps

关键词： Lightning Earth Fractals Power generation planning Power system protection Power system planning Power industry Distributed computing Probability density function Yield estimation

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An over-complete independent component analysis (ICA) approach to magnetic resonance image analysis

An over-complete independent component analysis (ICA) approa...

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2005 27th Annual International Conference of the engineering in Medicine and Biology Society, IEEE-EMBS 2005

作者： Wang, Jing Chang, Chein-I. Chen, Hsiang Ming Chen, Clayton Chi-Chang Chai, Jyh Wen Ouyang, Yen-Chieh Remote Sensing Signal and Image Processing Laboratory Department of Computer Science and Electrical Engineering University of Maryland Baltimore County Baltimore MD 21250 Department of Electrical Engineering National Chung Hsing University Taichung Taiwan Department of Radiology Taichung Veterans General Hospital Taichung Taiwan

ISBN: (纸本)0780387406

This paper presents a new application of independent component analysis (ICA) in magnetic resonance (MR) image analysis. One of most successful applications for ICA-based approaches in MR imaging is functional MRI (fMRI) which basically deals with one-dimensional temporal signals. The ICA approach proposed in this paper is rather different and considers a set of MR images acquired by different pulse sequences as a 3-dimensional image cube and performs image analysis rather than signal analysis. One major difference between the fMRI-based ICA approaches and our proposed ICA-based image analysis is that the ICA used in the former is under-complete as opposed to the latter which uses over-complete ICA. Such a fundamental difference results in completely different applications. © 2005 IEEE.

关键词： Magnetic resonance imaging

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Comparison of entropy-based characterization of lightning strike maps using planar and spherical coordinates

Comparison of entropy-based characterization of lightning st...

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Canadian Conference on electrical and computer engineering 2005

作者： Faghfouri, A. Kinsner, W. Swatek, D. Dept. of Electrical and Computer Engineering Signal and Data Compression Laboratory University of Manitoba Winnipeg Man. R3T 5V6 Canada Insulation Engineering and Testing Department Manitoba Hydro 1840 Chervier Blvd. Winnipeg Man. R3C 2P4 Canada

In this paper, effects of including the curvature of the Earth in the characterization of the lightning strike maps (LSMs) are studied. Lightning strikes can adversely affect the power generation and distribution systems, and behaviour prediction of such LSMs is of interest for protection and planning in the power industry. Characterization is one of the important stages of the behaviour prediction. We have shown that multifractal measures such as the Rényi fractal dimension spectrum (RS) are appropriate for characterization of such LSMs which are self-affine. The computation of the RS is based on estimating the probability density function (pdf) of the lightning strikes distribution. Since the LSMs range from very large to low densities over a large geographical area such as Manitoba, computing this pdf in planar coordinates is subject to a nonlinear error due to the curvature of the Earth. Thus, modelling and calculating the maps in spherical coordinates yields a better estimation of the pdf. The data of the LSMs have been collected by the Canadian Lightning Detection Network (CLDN) during the year 2002. The LSMs of Manitoba are characterized through regular (using planar coordinates) and modified (using spherical coordinates) RS techniques. The results indicate that regular RS technique alters the characteristics of the feature space, especially in latitudinal direction, and causes sparser features in the feature space, while using the modified RS technique alleviates all these problems, and provides a more accurate characterization which is necessary for a reliable classification of the maps. © 2005 IEEE.

关键词： Lightning

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Some advances in cognitive informatics

Some advances in cognitive informatics

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IEEE International Conference on Cognitive Informatics

作者： W. Kinsner Signal and Data Compression Laboratory Department of Electrical and Computer Engineering and the Institute of Industrial Mathematical Sciences and Telecommunications Research Laboratories TRLaboratories University of Manitoba Winnipeg MAN Canada

This paper summarizes a few recent developments in cognitive informatics, with special emphasis on signal processing for autonomic computing and its metrics.

关键词： Cognitive informatics signal processing Biomedical measurements Pollution measurement Fractals Acoustic noise Biological materials Biomedical materials Cognition Humans

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