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IEEE International Conference on Communications (ICC)

作者： A.R. Calderbank S.N. Diggavi N. Al-Dhahir Program in Applied and Computational Mathematics Princeton University Princeton NJ USA School of Computer and Communication Sciences Swiss Federal Institute of Technology Lausanne Switzerland Department of Electrical Engineering University of Technology Dallas TX USA

This paper designs space-time codes for standard PSK and QAM signal constellations that have flexible rate, diversity and require no constellation expansion. Central to this construction are binary partitions of the PSK and QAM constellations that appear in codes designed for the Gaussian channel. The space-time codes presented here are designed by separately specifying the different levels of the binary partition in the space-time array. The individual levels are addressed by either the binary symmetric matrices associated with codewords in a Kerdock code or other families of binary matrices. Binary properties of these sets are sufficient to verify the diversity property of the codewords in the complex domain. Larger sets of binary symmetric matrices (such as the set used in Delsarte-Goethals codes) are used to trade diversity protection for increased rate.

关键词： Space time codes Phase shift keying Quadrature amplitude modulation Constellation diagram Symmetric matrices Binary phase shift keying Quadrature phase shift keying Transmitting antennas Fading Mathematics

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Picosecond response of metal-semiconductor-metal ultraviolet photodiodes

Picosecond response of metal-semiconductor-metal ultraviolet...

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Conference on Lasers and Electro-Optics (CLEO)

作者： Jianliang Li W.R. Donaldson T.Y. Hsiang Material Science Program a d olboratory for Laser Energetics University of Rochester Rochester NY USA Laboratory for Laser Energetics University of Rochester Rochester NY USA Department of Electrical and Computer Engineering University of Rochester Rochester NY USA

We studied the ultrafast response in metal-semiconductor-metal ultraviolet photodiodes fabricated on GaN. The best performance of a device with 1-/spl mu/m finger width and spacing showed a 3.5-ps response. The pulse ... 详细信息

ISBN: (纸本)1557527776

关键词： Photodiodes Optical pulse shaping Fingers Energy measurement Gallium nitride Optical devices Ultrafast optics Time measurement Laser theory Rivers

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Voice transmission over all-IP tandem links

Voice transmission over all-IP tandem links

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Conference Record of the Thirty-Seventh Asilomar Conference on Signals, Systems and computers

作者： Wei, Bo Gibson, Jerry D. Department of Electrical Engineering Southern Methodist University Dallas TX 75275 Media Arts Technology Program Electrical and Computer Engineering Univ. of California Santa Barbara Santa Barbara CA 93106-6065

We investigate the issues in voice communications using IP over tandem connections of wireline and wireless links with the goal of determining end-to-end system performance. We study the particular example of using G.711 speech coding in the backbone wireline network and Adaptive Multi-rate (AMR) speech coding in a wireless LAN tandem network and study the impact of specific methods of adaptive re-encoding, error concealment, error control coding, and network protocol design to deliver the desired end-to-end quality of service. In addition to simulation results and objective speech quality measures, we present estimation-theoretic and information-theoretic analyses for the tandem packet loss link connections.

关键词： Telecommunication links

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Virtual PQ troubleshooter

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IEEE Power and Energy Magazine 2003年第3期1卷 24-31页

作者： Li, Chun Xu, Wilsun Hughes, Brent Gurney, James Neilson, Bruce Electrical and Computer Engineering Department University of Alberta Canada University of Alberta Canada Revenue Metering and Distribution Standards BC Hydro Canada IEEE Cigré Study Committee 36 BC Hydro's Strategic Research and Development Program IEEE Canada

An overview is given of the development of a PQ instrument that is specifically geared to power quality troubleshooting applications. The development has benefited from recent advancement in PC-based instrumentation technology and PQ disturbance source detection methods. The resultant instrument is a virtual tool, a laptop equipped with a PCMCIA card that performs all the instrumentation functions. This strategy has enhanced the reliability and flexibility of the device and also reduced the development efforts.

关键词： Electric power systems

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RJSSim: A reconfigurable job scheduling simulator for parallel processing learning 33

RJSSim: A reconfigurable job scheduling simulator for parall...

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33rd Annual Frontiers in Education, FIE 2003

作者： Góes, Luís F.W. Martins, Carlos A.P.S. Pontifical Catholic University of Minas Gerais Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil Pontifical Catholic University of Minas Gerais Computer Science Department Post-Graduation Program in Electrical Engineering Computational and Digital Systems Laboratory Belo HorizonteMG Brazil

ISBN: (纸本)0780379616

In this work, we present and analyze the use of a reconfigurable job scheduling simulator called RJSSim as an aid tool for parallel processing learning. This software is a functional and performance Java-based simulator of job scheduling policies. Our objectives are: to present RJSSim;to show the use of RJSSim and reconfigurability concepts for parallel processing learning. First, we present a prototype of RJSSim and the reconfigurability concept. Then we describe two case studies remarking the main parallel processing concepts and skills students can learn. In the first case study, we analyze two parallel algorithm models. In the second, we do some performance tests among parallel (reconfigurable) scheduling policies and architectures. Then, we analyze the performance through some metrics like response time, idle time etc. Finally we discuss and analyze the use of RJSSim for parallel processing learning. Our main contribution is: an implementation of RJSSim for parallel processing learning. © 2003 IEEE.

关键词： Parallel algorithms

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Controller Design via Adaptive Critic and Model Reference Methods

Controller Design via Adaptive Critic and Model Reference Me...

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International Joint Conference on Neural Networks 2003

作者： Lendaris, G.George Santiago, Roberta McCarthy, Jay Carroll, Michael Systems Science Ph.D. Program Electrical and Computer Engineering Portland State University Portland OR 97201 United States Systems Science Ph.D. Program Portland State University Portland OR 97201 United States Electrical Engineering Department Portland State University Portland OR 97201 United States Computational Neuroscience University of Chicago Chicago IL United States

Dynamic program.ing (DP) is a principled way to design optimal controllers for certain classes of nonlinear systems;unfortunately, DP is computationally very expensive. The Reinforcement Learning methods known as Adaptive Critics (AC) provide computationally feasible means for performing approximate Dynamic program.ing (ADP). The term 'adaptive ' in A C refers to the critic 's improved estimations of the Value Function used by DP. To apply DP, the user must craft a Utility function that embodies all the problem-specific design specifications/criteria. Model Reference Adaptive Control methods have been successfully used in the control community to effect on-line redesign of a controller in response to variations in plant parameters, with the idea that the resulting closed loop system dynamics will mimic those of a Reference Model. The work reported here 1) uses a reference model in ADP as the key information input to the Utility function, and 2) uses ADP off-line to design the desired controller. Future work will extend this to on-line application. This method is demonstrated for a hypersonic shaped airplane called LoFL YTE®;its handling characteristics are natively a little "hotter" than a pilot would desire. A control augmentation subsystem is designed using ADP to make the plane "feel like " a better behaved one, as specified by a Reference Model. The number of inputs to the successfully designed controller are among the largest seen in the literature to date.

关键词： Adaptive control systems

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Realization adaptive strategies and a comparison of Fourier bandwidth, Shannon bandwidth, and Campbell bandwidth

Realization adaptive strategies and a comparison of Fourier ...

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Data Compression Conference, DCC 2003

作者： Tang, Wenye He, Tao Gibson, Jerry D. Globespan Virata Inc. 100 SchulzDrive Red BankNJ07701 United States Electrical Engineering Department Southern Methodist University DallasTX75275 United States Media Arts and Technology Program and Electrical and Computer Engineering University of California at Santa Barbara Santa BarbaraCA93106 United States

ISBN: (纸本)0769518966

In 1960, Campbell derived a quantity that he defined as the coefficient rate of a random process that involves the process spectral entropy. However, no potential applications of the coefficient rate were identified. Two new derivations of Campbell's rate coefficient rate are presented. One derivation solidifies the interpretation of this quantity as a coefficient rate and allows definition of an effective bandwidth for the process. The second derivation implies a new approach for realization adaptive source compression. The coefficient rate can be used for realization adaptive coefficient selection in a sequence of source representations. Furthermore, the effective bandwidth is designated as Campbell bandwidth and contrasted with Fourier bandwidth and Shannon bandwidth. Several specific examples are presented that illustrate the differences among the three quantities. © 2003 IEEE.

关键词： Entropy

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A university-based web resource supporting the Xilinx University program

A university-based web resource supporting the Xilinx Univer...

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2003 IEEE International Conference on Microelectronic Systems Education, MSE 2003

作者： Shanblatt, Michael A. Foulds, Brian Kane, Patrick Acevedo, Anna Department of Electrical and Computer Engineering Michigan State University East LansingMI48824 United States Xilinx University Program Xilinx Corporation 2100 Logic Drive San JoseCA95124 United States

ISBN: (纸本)0769519733

The Xilinx University program.is supported by a comprehensive web resource developed and maintained by students at the department of electrical and computer engineering at Michigan State University. The site is designed specifically to support Xilinx University program.partners using Xilinx products for teaching and research. Materials on laboratories, hardware, and other support resources that can help improve classroom preparation and interaction are provided for faculty. For students, hardware and software tutorials that shorten the learning curve, as well as a number of student projects are available. To tie everything together, a strong on-line support system, with an email question submission facility and FAQ's is in place to help find answers to questions or problems encountered in using Xilinx tools. © 2003 IEEE.

关键词： Students

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Analysis of the trade-offs between manual and computer-based stereology/classification

Analysis of the trade-offs between manual and computer-based...

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Annual Northeast Bioengineering Conference

作者： Z. Markowitz M.H. Loew Biomedical Engineering Program Department of Electrical and Computer Engineering George Washington University Washington D.C. DC USA

Estimation of volume, surface area, area, length and number in stereology is based on a manual count of the number of intersections between the feature of interest and a specific low-resolution geometrical test probe. It is usually a tedious and imprecise process, hut benefits from the user's ability to identify the feature of interest. In computer-based stereology, by contrast, a high-resolution test probe is used, generally yielding greater precision but suffering from imperfection of the automated classification. The trade-offs between manual and computer-based stereology are introduced and the conditions under which each is advantageous are defined.

关键词： Labeling Probes Testing Image processing Biology computing Pixel computer errors Humans Concurrent computing Biomedical computing

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The trade-offs between manual and computer-based stereology/classification: application to estimates of volume fraction

The trade-offs between manual and computer-based stereology/...

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Annual International Conference of the IEEE engineering in Medicine and Biology Society (EMBC)

作者： Z. Markowitz M.H. Loew Biomedical Engineering Program Department of Electrical and Computer Engineering George Washington University Washington D.C. DC USA

Estimation of volume or the ratio of volumes in an image requires both mensuration and classification. The former is achieved through stereology - a set of techniques that estimate such parameters as area, volume, surface area, length, and number. Classification is achieved by extracting features that capture discriminating information (e.g., about tissue type). Both stereology and classification can be performed either manually or by computer. Manual techniques for the combination are based on coarse point counting (low resolution), but assumed perfect pixel classification. computer-based methods, on the other hand, rely on very fine point counting but in general suffer from imperfect pixel classification. This paper examines the interaction between manual and image processing-based approaches; in particular, we present a measure that combines the classification and measurement errors. Estimation of the variance is used to define the conditions under which each method is and is not advantageous despite its underlying error. This allows the user to choose a method that optimizes overall performance, given the human and machine capabilities available. Illustrations are given of cases in which each method can be preferable, as measured by the variance of the estimate of the performance that was inferred from the measurement.

关键词： Application software Parameter estimation Data mining Feature extraction Manuals Particle measurements Measurement errors Estimation error Optimization methods Humans

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