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Canadian Conference on Electrical and computer engineering (CCECE)

作者： Lefrancois Haccoun Department of Electrical and Computer Engineering École Polytechnique de Montréal Montreal QUE Canada

The applications of low rate convolutional codes in code division multiple access (CDMA) and high error rate channels is well known. Unfortunately. In searching for optimal long constraint length and very low rate codes the computational effort is prohibitive. In this paper. A method for generating quasi-optimum new very low rate (1/128/spl les/R/spl les/1/3) and moderately long constraint length (K/spl les/14) codes is presented. These codes have the interesting characteristics of being rate compatible and easy to generate. The codes presented in this paper provide superior performances to the known low rate codes of the same rates and constraint lengths.< >

关键词： Convolutional codes Code division multiaccess

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A new adaptive double envelope feedback (ADEF) linearizer for mobile radio power amplifiers

A new adaptive double envelope feedback (ADEF) linearizer fo...

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Microwave, MTT-S International Symposium

作者： J.-S. Cardinal F.M. Ghannouchi Microwave Research Laboratory Electrical & Computer Engineering Department École Polytechnique de Montdréal University of Montreal Montreal Canada

A new Adaptive Double Envelope Feedback (ADEF) linearizer using a voltage controllable phase shifter and a dynamic gate bias on a MESFET is developed and implemented on a class AB, one Watt amplifier. A two tone test at 1.7 GHz shows in-band intermodulation products of 40 dBc over a 10 dB dynamic range with a total two-tone power added efficiency of 32%.< >

关键词： Programmable control Adaptive control Linear feedback control systems Voltage control Phase shifters MESFETs Testing Dynamic range

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A built-in self-test approach for medium to high-resolution digital-to-analog converters

A built-in self-test approach for medium to high-resolution ...

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Asian Test Symposium (ATS)

作者： K. Arabi B. Kaminska J. Rzeszut Department of Electrical and Computer Engineering École Polytechnique de Montréal Montreal QUE Canada Institute of Computer Science Warsaw University of Technology Montreal QUE Canada

A test approach and circuitry suitable for built-in self-test (BIST) of medium to high-resolution digital-to-analog (D/A) converter are described. Offset, gain, linearity and differential linearity errors are tested without using mixed-mode or logic test equipment. The proposed BIST structure presents a compromise between test cost, area overhead and test time. The BIST circuitry has been designed using CMOS 1.2 /spl mu/m technology. The simulations performed show that the BIST is applicable for testing D/A converters up to 16-bits resolution. By a minor modification the test structure would be able to localize the fail situation and to test all D/A converters on the chip.< >

关键词： Built-in self-test Digital-analog conversion Circuit testing Voltage Analog-digital conversion Logic testing Linearity Analog circuits CMOS technology Integrated circuit testing

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An architectural approach for increasing clock frequency and communication speed in monolithic-WSI systems

An architectural approach for increasing clock frequency and...

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International Conference on Wafer Scale Integration

作者： D. Audet Y. Savaria N. Arel Computer Engineering Department Universite du Quebec a Chicoutimi Chicoutimi QUE Canada Electrical Engineering Department Ecole Polytechnique de Montrèal Montreal QUE Canada

Based on special pipelining techniques, a new methodology for increasing the clock frequency and communication speed in monolithic-WSI systems is proposed. Spice simulations show that the clock frequency on wafer scale systems implemented using a 1.2 micron CMOS technology can be operated well above 140 MHz, which is approximatively five times the maximum frequency of current systems. It is also shown that pipelining principles can be applied to communication links. That particular strategy allows to speedup communication transfers on 5 cm interconnection wires, such as those running across a wafer, by a factor between two and ten, as compared to the case in which no pipelining is used.< >

关键词： Clocks Wire Inverters Pipeline processing CMOS technology SPICE Very large scale integration Frequency estimation System performance Delay effects

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High power microwave impedance measurements system suitable for in-situ thermo-dielectric material characterisation

High power microwave impedance measurements system suitable ...

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Microwave, MTT-S International Symposium

作者： M. Caron C. Akyel F.M. Ghannouchi Department of Electrical and Computer Engineering École Polytechnique Montreal QUE Canada Polytechnique Montreal Montreal QC CA Dept. of Electr. & Comput. Eng. Ecole Polytech. Montreal Que. Canada

A novel family of six-port reflectometers, designed in hybrid stripline-waveguide technology, is proposed for high power applications. In principle, there is no limitation in the input power level and the design can be adapted for any waveguide frequency band. A prototype was designed for the operational frequency of 2.45 GHz and measurements were made at power level up to 200 W.< >

关键词： Impedance measurement Stripline Prototypes Power measurement Frequency measurement

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An expert system for steady state voltage stability

An expert system for steady state voltage stability

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Canadian Conference on Electrical and computer engineering (CCECE)

作者： Mohamedi Belhadj Lefebvre Xuan-Dai Do Electrical and Computer Engineering Department Ecole polytechnique de montreal Montreal QUE Canada Institut de recherche d''Hydro Quebec Varennes QUE Canada

This paper discusses the steady state voltage stability control using an artificial intelligence technique. An expert system is designed to act as a decision making support to the power system operator. It suggests reactive control action to alleviate the system specified voltage stability violations. Sensitivities of voltage stability index to the bus voltage and the existing VAr control and compensation tools are used. The results of applying the approach of the knowledge-based rules to the AEP 30-bus test system are presented.< >

关键词： Power system dynamic stability Power system control Voltage control Expert systems Reactive power control

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A de-embedding technique for reflection-based S-parameters measurements of microwave devices

A de-embedding technique for reflection-based S-parameters m...

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Conference on Precision Electromagnetic Measurements (CPEM)

作者： F.M. Ghannouchi A. Brodeur F. Beauregard Polytechnique Montreal Montreal QC CA Dept. of Electr. & Comput. Eng. Ecole Polytech. de Montreal Que. Canada Microwave Research Laboratory Electrical and Computer Engineering Department Ecole Polytechnique de Montrèal Montreal Canada

A generalized calibration and de-embedding technique for reflection-based S-parameter measurements of microwave devices is proposed. This technique allows to perform the two-port calibration of a network analyzer directly from the embedded reflection coefficient measurements. This technique is a general one, in the sense that it can be implemented in network analyzers with or without transmission measurement capabilities.< >

关键词： Scattering parameters Microwave measurements Microwave devices Microwave theory and techniques Testing Fixtures Calibration Reflection Equations Coaxial components

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Laparoscopic surgery assisted by a robotic cameraman: concept and experimental results

Laparoscopic surgery assisted by a robotic cameraman: concep...

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IEEE International Conference on Robotics and Automation (ICRA)

作者： R. Hurteau S. DeSantis E. Begin M. Gagner Department of Electrical and Computer Engineering École Polytechnique de Montréal Montreal Canada Hôtel-Dieu de Montréal Centre de recherche en chirurgie Montreal Canada

Laparoscopic surgery is a new type of approach involving the use of a laparoscopic camera and special instruments which are inserted into the abdominal cavity through the abdominal wall. Over the last five years, a variety of complex abdominal surgical interventions have been developed and are now performed according to the minimally invasive surgery principle. In this article, a surgical procedure for a laparoscopic cholecystectomy (gallbladder removal) is presented that involves a robotic assistant. The robot manipulates the laparoscope and provides the video image as it moves into the abdominal cavity. The robot acts as a cameraman and replaces the surgical assistant. The concept of a robotic assistant is presented and the various modifications made to the robot are described. A motion control strategy permits easy teleoperation of the robot. Surgical interventions have been successfully performed, first on animals and then on 8 patients.< >

关键词： Minimally invasive surgery Robot kinematics Laparoscopes Cameras Abdomen Robot vision systems Surges Manipulators Biomedical optical imaging Arm

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Handwritten sentence recognition: from signal to syntax

Handwritten sentence recognition: from signal to syntax

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International Conference on Pattern Recognition

作者： R. Plamondon S. Clergeau C. Barriere Electrical & Computer Engineering Department Ecole Polytechnique de Montreal Montreal QUE Canada Natural Language Laboratory Computing Science Department Simon Fraser University Canada Centre National d''Etudes Des Telecommunications Lannion France

This paper describes a system dedicated to online handwritten sentence recognition. The prototype is made up of two basic processors. The first controls the data acquisition, pentip trace segmentation, letter identification. The second aims at identifying and correcting the words candidates by integrating syntactic and lexical information. Sentences are parsed to list the grammatical classes of each incorrect candidates then lexical query searches for words in a lexicon according to grammatical classes. A final decision is made using a string comparison algorithm. Tests of the complete system are reported at the end for a typical writer-dependent application.

关键词： Handwriting recognition Prototypes System testing Performance evaluation Natural languages Laboratories Process control Data acquisition Electronic equipment testing Application software

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POWER ADDED EFFICIENCY AND GAIN IMPROVEMENT IN MESFET AMPLIFIERS USING AN ACTIVE HARMONIC LOADING TECHNIQUE

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MICROWAVE AND OPTICAL TECHNOLOGY LETTERS 1994年第13期7卷 625-627页

作者： GHANNOUCHI, FM BEAUREGARD, F KOUKI, AB Microwave Research Laboratory Electrical & Computer Engineering Department Ecole Polytechnique de Montreal P.O. Box 6079 station ‘centre-ville’ Montréal Québec Canada H3C 3A7

A six-port-based multiharmonic load-pull setup is used to characterize a medium-power MESFET transistor for the design of microwave amplifiers. Complete load-pull measurements at the fundamental (1.7 GHz) and the second harmonic (3.4 GHz) are obtained for two bias points in class A and AB operation. It is shown that the power gain and the power added efficiency can vary up 0.6 dB and 6%, respectively, as the phase of the second harmonic load is changed. (C) 1994 John Wiley & Sons, Inc.

关键词： MESFET AMPLIFIERS HARMONIC LOADING TECHNIQUE 6-PORT NETWORK GAIN EFFICIENCY

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