By Topic

Electrical and Computer Engineering, Canadian Journal of

Issue 2 • Date N/A 1989

Filter Results

Displaying Results 1 - 11 of 11
  • Canadian Journal of Electrical and Computer Engineering - Front cover

    Page(s): c1
    Save to Project icon | Request Permissions | PDF file iconPDF (6851 KB)  
    Freely Available from IEEE
  • Inside front cover

    Page(s): c2
    Save to Project icon | Request Permissions | PDF file iconPDF (266 KB)  
    Freely Available from IEEE
  • Table of contents

    Page(s): 1
    Save to Project icon | Request Permissions | PDF file iconPDF (125 KB)  
    Freely Available from IEEE
  • A fast high-performance array processing technique for angle-of-arrival estimation and detection of the number of incident signals

    Page(s): 38 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1556 KB)  

    A new projection-based algorithm is proposed for estimating the angles of arrival of plane waves incident onto arrays of sensors. The method is based on a single QR decomposition of the signal covariance matrix; hence, it is much faster than eigen-based methods, which require many QR decompositions. It is shown that optimum performance is attained only if the columns of the covariance matrix are permuted in a prescribed manner before the QR decomposition proceeds. An adjunct to the angle-of-arrival estimation process is a new eigenvalue-free technique for estimating the number of incident signals. The performance penalty associated with these new methods is insignificant. The real-time performance of this technique is enhanced through the use of systolic arrays. A novel systolic array structure is proposed for extracting both the Q and R matrices generated by the QR decomposition. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Threshold extension of the modified FBLP algorithm

    Page(s): 46 - 54
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2535 KB)  

    Two methods are presented for extending the threshold characteristics of the modified forward-backward linear prediction (MFBLP) algorithm due to Tufts and Kumaresan (1982). This algorithm estimates angles of arrival of plane waves onto linear arrays of sensors. The first technique proposed, referred to as modified-modified FBLP (M2FBLP), offers 4- to 6-dB threshold extensions over MFBLP for a large number of snapshots, for a particular set of simulation parameters. The second technique, called optimized FBLP (opt-FBLP), offers similar threshold extension when the numer of snapshots is low. The opt-FBLP method is most successful when the number of incident signal components K is 2. The method is therefore viewed as being particularly applicable to the low-angle tracking problem in radar, since it has been shown that there is strong justification to fix the value of K at 2 in this situation. The increase in computational complexity required for M2-FBLP over MFBLP is virtually negligible. For opt-FBLP, the increase in computational complexity is minimal for K=2. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Co-ordination of thyristor-controlled VAr compensator and auxiliary controller of excitation system for small signal stability enhancement

    Page(s): 55 - 62
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3999 KB)  

    Technical advantages of co-ordinating thyristor-controlled static VAr compensators (SVC) and power system stabilizers (PSS) for stability enhancement during small signal dynamics are presented. The technical feasibility of the co-ordinated scheme for simultaneous damping of inertial and torsional oscillatory modes in a series-capacitor-compensated system is demonstrated. The investigations show that the co-ordinated scheme not only increases the overall system damping, but also prevents undesirable interactions between oscillatory modes. New control schemes for SVC and PSS, based on multi-input control concepts, are given. The studies are performed on system-1 of the second IEEE benchmark model, using an eigenvalue analysis method. The analytical results are verified by digital computer simulation studies, using the Bonneville Power Administration's Electromagnetic Transients Program (EMTP). View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Fast-decoupled transient stability

    Page(s): 63 - 66
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1323 KB)  

    Presents an improved method for computing transient stability using a fast-decoupled formulation of the transient energy function. The new formulation offers significant savings in computer time as compared to the existing Newton-Raphson formulation. It therefore represents a suitable technique for online transient stability computations in utility control centres. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Minimal multiplexer realization of logic functions

    Page(s): 67 - 71
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (937 KB)  

    It is well known that any n-variable logic function can be realized by a multiplexer (selector) with no additional external logic. Thus multiplexers have come to be known as universal logic modules. This approach to logic function realization requires the use of a 2n-input multiplexer with constant data inputs, or a 2n-1-input multiplexer whose data inputs are constants and single-variable functions; that is, each input is 0, 1, x, or x' for some variable x. The paper deals with conditions and algorithms for realizing some logic functions using smaller multiplexers. More precisely, a computationally simple condition is formulated to determine whether a given n-variable logic function is realizable by a multiplexer having 2n-2 or fewer inputs, and an algorithm is presented for finding the smallest subset of variables, containing n-2 or fewer members, to be used as control inputs in a minimal multiplexer realization. Once the control inputs are known, the data input functions can be readily computed. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • Quantization noise and eigenvalue statistics in the stochastic gradient polarity adjustment of an adaptive equalizer

    Page(s): 72 - 80
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1543 KB)  

    An experimental adaptive decision feedback equalizer (DFE), with jointly adjusted sampling phase, and which employs a decision-directed stochastic gradient polarity (DDSGP) algorithm, is described. Measured performance with respect to odd-order multipath frequency response is found to be significantly worse than the calculated mean square error performance which does not include quantization noise and misadjustment noise. The discrepancy is predicted from a theorem of Gersho (1968), Gersho's theorem predicts the excess noise due to the gradient polarity (GP) algorithm as a function of eigenvalue statistics, which are calculated as a function of multipath distortion. View full abstract»

    Full text access may be available. Click article title to sign in or learn about subscription options.
  • [Back inside cover]

    Page(s): c3
    Save to Project icon | Request Permissions | PDF file iconPDF (278 KB)  
    Freely Available from IEEE
  • [Back cover]

    Page(s): c4
    Save to Project icon | Request Permissions | PDF file iconPDF (72 KB)  
    Freely Available from IEEE

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