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Microwave, MTT-S International Symposium

作者： R. Hajji F.M. Ghannouchi A.B. Kouki Dept. of Electr. & Comput. Eng. Ecole Polytech. de Montreal Que. Canada Microwave Research Laboratory Department of Electrical and Computer Engineering Ecole Polytechnique de Montreal Canada

A systematic scaling approach for the modeling of high-power/large-size HBTs is presented. The measured S-parameters of a three elementary-cell HBT are compared to those obtained with the scaled model and the commonly used lumped equivalent circuit model. It is shown that a better fit to the measured S parameters is obtained when the scaled model is used. The interconnections and parasitics between elementary cells are accounted for based on the actual footprint of the device.< >

关键词： Power system modeling Scattering parameters Heterojunction bipolar transistors Equivalent circuits Integrated circuit interconnections

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On the nature and application of the space spectral-domain approach (SSDA)

On the nature and application of the space spectral-domain a...

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Microwave, MTT-S International Symposium

作者： Ming Yu R. Vahldieck Ke Wu COM DEV International Limited Cambridge ONT Canada Department of Electrical and Computer Engineering University of Victoria Victoria BC Canada Dept de genie Electrique Ecole Polytechnique Montreal QUE Canada

This paper describes the equivalence between the spectral domain method (SDM) and the method of lines (MoL). On the basis of this equivalence the Space-Spectral Domain Approach (SSDA) can be explained as either a two ... 详细信息

关键词： Discrete Fourier transforms Planar transmission lines Coplanar waveguides Transmission line theory Fourier transforms Eigenvalues and eigenfunctions Tellurium Application software Drives Resonant frequency

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WINDOWED FOURIER PHASE - COMPLETENESS AND SIGNAL RECONSTRUCTION

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IEEE TRANSACTIONS ON SIGNAL PROCESSING 1993年第2期41卷 657-666页

作者： WENG, JY Department of Electrical Engineering and Computer Engineering Ecole Polytechnique University of Montreal Montreal QUE Canada Centre de Recherche informatique de Montreal Inc. Montreal QUE Canada Department of Computer Science Michigan State University East Lansing MI USA

Recently, an image matching theory has been developed in which the windowed Fourier phase (WFP) is introduced as the primary primitive for stereo matching as well as motion matching. Although the WFP has several desirable properties, its use raises a fundamental question about its completeness in representing signals: to what degree are signals determined by their WFP? In this paper, it is established that a signal, either continuous or discrete, is determined tip to a multiplicative constant by its WFP at any frequency. This result indicates that the WFP contains richer information than zero crossings and peaks. It also provides insight into why WFP-based image matching may achieve highly accurate and stable results. To experimentally demonstrate the completeness of the WFP, an algorithm is developed to reconstruct signals from the WFP.

关键词： Signal reconstruction Frequency Image matching Image reconstruction

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A CALIBRATION AND MEASUREMENT METHOD OF A TRI-6-PORT NETWORK ANALYZER SUITABLE FOR ON-WAFER CHARACTERIZATION OF 3-PORT DEVICES

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IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT 1993年第4期42卷 864-866页

作者： GHANNOUCHI, FM Microwave Research Laboratory Electrical and Computer Engineering Department Ecole Polytechnique de Montrèal Montreal QUE Canada

A calibration and measurement method of a wideband tri-six-port network analyzer (TSPNA) is proposed. The scattering parameters of a three-port device under test are found to be the unknowns of a set of nine simultaneous complex linear equations. These equations are established via a group of three calibrated linearly independent excitations. No isolators are required for calibration and measurement procedures, Three unknown reciprocal two-port standards are needed for the calibration of the TSPNA. The proposed method is rigorous, explicit, and suitable for wideband on-wafer three-port device S-parameter measurements. It can easily be adapted for heterodyne automated network analyzers equipped with three reflection test-set units.

关键词： Calibration Equations Scattering parameters Wideband Isolators Automatic testing Rotation measurement Bandwidth Reflection Microwave devices

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An expert system guide for load flow planning

An expert system guide for load flow planning

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1993 Canadian Conference on Electrical and computer engineering, CCECE 1993

作者： Belhadj, C. Chouchane, T. Do, Xuan-Dai Lefebvre, S. Electrical and Computer Engineering Department Ecole Polytechnique de Montreal MontrealQC Canada Institut de Reherche d'Hydro-Quebec VarennesQC Canada

ISBN: (纸本)0780314433

This paper presents an expert system composed of two knowledge-based programs designed to help power system planners and to assist system operators. The first is designed to guide to the solution of system voltage violations. The second knowledge-base is developed to perform power rerouting to alleviate line overloads. Both systems use the sensitivity factor concept to converge to a decision. Voltage sensitivities to various control tools such as shunt compensation, transformer tap changes and generator voltage controls are used. Power rerouting is achieved through distributions-factors directives for generation re-scheduling. The production rules are applied to two power system models to demonstrate of the effectiveness of the developed engines. The obtained results are consistent with the load flow run. © 1993 IEEE.

关键词： Expert systems

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Novel transformer connection to improve current sharing in high current DC rectifiers

Novel transformer connection to improve current sharing in h...

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Conference Record of the IEEE Industry Applications Society Annual Meeting (IAS)

作者： G. Olivier G.-E. April E. Ngandui C. Guimaraes Department of Electrical and Computer Engineering Ecole Polytechnique de Montrèal Montreal QUE Canada

A novel, nonconventional family of power converters for low-voltage high-current applications based on a peculiar series connection of the primary windings is presented. On the secondary side, all the semiconductors are directly connected in parallel without resorting to the use of interphase transformers or any other current sharing means. The series connection of the primaries ensures current sharing while the zigzag arrangement provides the desired pulse number. Several prototypes were assembled to verify the validity of the theoretical analysis. All the results confirmed the analysis.< >

关键词： Rectifiers Oil insulation Semiconductor diodes Thyristors Bridge circuits Pulse transformers Application software Low voltage Semiconductor device reliability Conductors

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Near-field characterization of PCBs for radiated emissions prediction

Near-field characterization of PCBs for radiated emissions p...

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IEEE International Symposium on Electromagnetic Compatibility (EMC)

作者： J.-J. Laurin Department of Electrical and Computer Engineering École Polytechnique de Montréal Montreal QUE Canada

A method for characterizing printed circuit boards as sources of radiated emissions is proposed. The method uses probe measurements made in the very close vicinity of the device under test (DUT). These measurements can be processed to determine the emission level at any distance from the DUT. Due to its near-field nature, this technique does not require anechoic electromagnetic-compatibility (EMC) rooms or open area test sites, which makes it very attractive from an economical point of view. The key point of the characterization is the expansion of the current distribution on the circuit board into a set of filamentary current basis functions. The interaction between the basis functions and the near-field probe is calculated with the method of moments. Accurate field predictions were obtained for planar structures having a 1.25-mm wire spacing.< >

关键词： Printed circuits Probes Electromagnetic measurements Circuit testing Electromagnetic compatibility Open area test sites Economic forecasting Current distribution Moment methods Wire

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A Markovian Evaluation of the Frame Error Probability for the M Algorithm

A Markovian Evaluation of the Frame Error Probability for th...

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IEEE International Symposium on Information Theory

作者： J. Belzile D. Haccoun Department of Electrical and Computer Engineering Ecole Polytechnique de Montrèal Montreal QUE Canada

A new Markov chain approach to the evaluation of the frame error probability for the M-Algorithm is presented. Using this model results for values of M=1 to 64 and frame length of L=64 to 512 bits have been evaluated for a convolutional code of memory length v=19 and rate R=1/2. Simulation results are compared to the Markovian model showing that the technique is attractive for the performance evaluation of suboptimal decoding algorithms for convolutional codes.

关键词： Error probability Decoding Convolutional codes Upper bound Error correction Performance analysis Algorithm design and analysis Additive white noise Hamming weight Propagation losses

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Bidirectional Decoding of Convolutional Codes Over Rayleigh Fading Channels

Bidirectional Decoding of Convolutional Codes Over Rayleigh ...

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IEEE International Symposium on Information Theory

作者： J. Belzile D. Haccoun S. Forest Department of Electrical and Computer Engineering Ecole Polytechnique de Montrèal Montreal QUE Canada

A suboptimal breadth-first multiple-path bidirectional decoding algorithm for convolutional codes has been shown to provide very attractive error performances over the binary symmetric channel. In this paper, new computer simulation results for bidirectional decoding of convolutional codes over soft-decision Rayleigh fading channels are presented. Using a memory length v = 19 and rate R = 1/2 code, these results show that a gain near 5 dB can be achieved for a low frame error probability (P/sub f/ < 10/sup -3/) over the Viterbi algorithm of equivalent decoding complexity (v = 6, R = 1/2). The results also indicate that, depending on the length of the frames, a significant gain can also be achieved for low bit error probability (P/sub b/ < 10/sup -5/).

关键词： Decoding Convolutional codes Fading Viterbi algorithm Error probability Error correction computer simulation Bit error rate Performance gain computer errors

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A high speed parallel structure for the basic wavelet transform algorithm

A high speed parallel structure for the basic wavelet transf...

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IEEE International Symposium on Circuits and Systems (ISCAS)

作者： H. Khali J.L. Houle Y. Savaria Electrical and Computer Engineering Department Ecole Polytechnique de Montrèal Montreal QUE Canada

A new architecture that can support wavelet analysis in both compression and dilation is discussed. Its efficiency allows processing at speeds of up to one input sample per clock cycle without buffering. Therefore, it can generate several wavelet coefficients at the same time. This architecture is fully parallel, and it can easily be adapted to user requirements by specifying some constraints at compile time during a synthesis process.< >

关键词： Wavelet transforms Continuous wavelet transforms Discrete wavelet transforms Frequency computer architecture Wavelet analysis Signal resolution Concurrent computing Wavelet coefficients Time factors

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