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Electrical and Computer Engineering, Canadian Journal of

Issue 3 • Date July 2004

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Displaying Results 1 - 10 of 10
  • Canadian Journal of Electrical and Computer Engineering

    Page(s): 1 - 4
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    Freely Available from IEEE
  • Table of contents

    Page(s): 5
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    Freely Available from IEEE
  • Message from the editors

    Page(s): 158
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    Freely Available from IEEE
  • Interleaved FEC/ARQ coding for QoS multicast over the internet

    Page(s): 159 - 166
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    The technology of real-time reliable multicast over a best-effort service network has become more popular recently. In this paper, a new technique is introduced that integrates word interleaving, forward error correction (FEC) and automatic repeat request (ARQ) to mitigate the error and loss effects encountered in wired and wireless Internet applications. For multicast video sessions spanning tens of routers, the integration of interleaving, FEC and ARQ as well as fine tuning of the various parameters of each mechanism will play a major role in the move towards successful deployment. In this work, the basic algorithms for integrated error control are first derived. Then the corresponding real-time implementations for an experimental testbed to achieve the practical performance of these techniques are completed. The performance of the scheme is analyzed, and laboratory results are compared with analytical results. View full abstract»

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  • Efficient frequency-domain modelling and simulation of nonuniform coupled transmission lines: application in transient analysis of VLSI circuits

    Page(s): 167 - 177
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    A new method of analysis of the transients in nonuniform lossy multiconductor transmission lines with frequency-dependent parameters is presented. The terminations may be nonlinear, and the interconnections networks are arbitrary. The method of the solution is based on steplines approximation of the nonuniform transmission lines and quasitransverse electromagnetic mode (quasi-TEM) assumptions. Using steplines approximation, the system of coupled nonuniform transmission lines is subdivided into an arbitrarily large number of coupled uniform lines (steplines) with different characteristics. Then, using the modal decomposition method, the system of coupled partial differential equations for each step is decomposed into a number of uncoupled ordinary telegraph equations, which are then solved in the frequency domain. Thereafter each step of the system is modelled as a linear filter with frequency-dependent coefficients. The terminations for linear and nonlinear cases are then modelled as linear or nonlinear systems. Finally, the transfer matrix of the system is obtained. Some examples from the literature are then solved to demonstrate the validity of the method. The method proposed here is very fast and can easily be implemented using general-purpose software packages like MATLAB. View full abstract»

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  • A novel transform-domain image watermark

    Page(s): 179 - 182
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    A novel transform-domain image watermark based on cepstrum analysis is proposed in this paper. A complex cepstrum-based scheme is developed to embed a gray-level image in the one-dimensional cepstrum components of the original image signal. Computer simulation results show that the proposed algorithm is imperceptible and is robust to most watermarking attacks, especially to image cropping, JPEG compression and multipliable noise. View full abstract»

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  • A survey of software testing practices in alberta

    Page(s): 183 - 191
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    Software organizations have typically de-emphasized the importance of software testing. In this paper, the results of a regional survey of software testing and software quality assurance techniques are described. Researchers conducted the study during the summer and fall of 2002 by surveying software organizations in the Province of Alberta. Results indicate that Alberta-based organizations tend to test less than their counterparts in the United States. The results also indicate that Alberta software organizations tend to train fewer personnel on testing-related topics. This practice has the potential for a two-fold impact: first, the ability to detect trends that lead to reduced quality and to identify the root causes of reductions in product quality may suffer from the lack of testing. This consequence is serious enough to warrant consideration, since overall quality may suffer from the reduced ability to detect and eliminate process or product defects. Second, the organization may have a more difficult time adopting methodologies such as extreme programming. This is significant because other industry studies have concluded that many software organizations have tried or will in the next few years try some form of agile method. Newer approaches to software development like extreme programming increase the extent to which teams rely on testing skills. Organizations should consider their testing skill level as a key indication of their readiness for adopting software development techniques such as test-driven development, extreme programming, agile modelling, or other agile methods. View full abstract»

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  • Modelling surface-micromachined electrothermal actuators

    Page(s): 193 - 202
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    A method for the accurate simulation of electrothermal actuators is presented. The model accounts for variations in material parameters that occur over the temperature range at which polysilicon electrothermal actuators are operated. The paper then presents the steps necessary to perform a sequential electrothermal-mechanical analysis using ANSYS modelling software. The model is compared against actuators fabricated using a surface-micromachining process called MUMPs. The literature concerning thematerial parameters associated with this process that are necessary for the simulation is reviewed. View full abstract»

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  • An experimental performance evaluation of a novel radio-transmitter identification system under diverse environmental conditions

    Page(s): 203 - 209
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    In this paper, the effects of environmental conditions on a radio-transmitter identification system are investigated. Transmissions from 10 commercial VHF FM transmitters operating under varying environmental conditions are analyzed using an experimental setup. It is observed that a change in environmental conditions such as battery voltage or ambient temperature causes the feature vectors to spread over the feature space, resulting in classification performance degradation. It is experimentally shown that performance degradation resulting from changing environmental conditions can be compensated for by training the system with data collected in a range of battery-voltage and ambient temperature levels. The signal-to-noise ratio versus probability of correct classification is also determined for systems operating in noisy channels in order to obtain a confidence measure for the classification decision to be made. The transient features are extracted using a technique based on the amplitudes and phase changes of the received signals. This technique is well suited to radio-transmitter turn-on transient signals, and classification with these features, as shown, outperforms current techniques. View full abstract»

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Aims & Scope

The role of the Canadian Journal of Electrical and Computer Engineering is to provide scientific and professional activity for its members in Canada, the CJECE complements international journals and will be of particular interest to anyone involved in research and development activities in the field of electrical and computer engineering.

Full Aims & Scope

Meet Our Editors

Editor-in-Chief
Dr. Shahram Yousefi
Dept. of Electrical and Computer
     Engineering
Queen's University