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Electrical and Computer Engineering, Canadian Journal of

Issue 4 • Date Oct. 1992

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Displaying Results 1 - 14 of 14
  • Canadian Journal of Electrical and Computer Engineering - Front cover

    Publication Year: 1992 , Page(s): c1
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  • Inside front cover

    Publication Year: 1992 , Page(s): c2
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  • Table of contents

    Publication Year: 1992 , Page(s): 1
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  • Guest editor's comments: Mobile communications research in Canada

    Publication Year: 1992 , Page(s): 148
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  • Membership survey results

    Publication Year: 1992 , Page(s): 149 - 151
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  • Future public land mobile telecommunication systems

    Publication Year: 1992 , Page(s): 152 - 155
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    In March 1992, the World Administrative Radio Conference (WARC) of the International Telecommunication Union (ITU), identified global bands 1885-2025 and 2110-2200 MHz for future public land mobile telecommunication systems (FPLMTSs), including 1980-2010 and 2170-2200 MHz for the mobile satellite component. The potential for all FPLMTS radio interfaces to be in the same band provides a strong incentive for trying to maximize the commonality between the satellite and terrestrial component of FPLMTSs. This would simplify multimode mobile equipment and also greatly increase the utility of FPLMTSs for the provision of basic telecommunication needs in underdeveloped regions of the world. Extension of integrated voice, video and data telecommunications to a person rather than a place will have a dramatic effect on everyday life, and on the organizations which currently provide these services. The author outlines some of the international standards work in this area being carried out by the International Radio Consultative Committee/International Telegraph and Telephone Consultative Committee (CCIR/CCITT), in particular that of CCIR TG8/1 (formerly IWP8/13) on FPLMTS. View full abstract»

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  • Aeronautical mobile satellite services: The launching of a new era in mobile communications

    Publication Year: 1992 , Page(s): 156 - 159
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    The author introduces the subject of aeronautical mobile satellite communications, a new communications capability which will change the operation of airlines and air traffic control and offer new services to the flying public. A brief history of technical development is presented, including an overview of the international standard. This is followed by a description of the current status of equipment and service development from a Canadian viewpoint. View full abstract»

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  • Cellular capacity

    Publication Year: 1992 , Page(s): 160 - 166
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    The authors present a comparative analysis of the capacity of cellular systems configured to use orthogonal (time division or frequency division) or nonorthogonal (code division) multiple access methods. The analysis proceeds on the basis of information theory with minimum attention to the practical issues of propagation and reception in the UHF bands. The conclusion is that the maximum Shannon capacities of orthogonal and nonorthogonal cellular systems are within 25% of one another, with TDMA/FDMA having a slight advantage. View full abstract»

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  • Spread spectrum and coding for multiple access communications

    Publication Year: 1992 , Page(s): 167 - 174
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    Discusses the use of spread-spectrum modulation and error correction coding for multiple access communications such as mobile communications. The emphasis is on the connection between, and interdependence of, these two techniques. This connection is illustrated through three examples. The authors consider frequency-hopped (FH) spread-spectrum multiple access communications employing M-ary modulation and error correction coding. A mismatch between, for example, Q-ary Reed-Solomon (RS) codes and M-ary modulation, which is most likely to occur in practice, can drastically reduce network capacity. As a remedy, a matched M-ary BCH code is shown to outperform an RS code with a comparable code rate and decoding complexity when the number of users in the system is large. Frequency hopping is a nonlinear multiple access system. For a linear multiple access system such as a cellular, direct-sequence, code division multiple access (CDMA) system, it is pointed out that the capacity is linearly inversely proportional to the signal-to-noise ratio (Eb/N0) required at the receiver to maintain a given error performance. Therefore the key to increasing the CDMA capacity is to increase the coding gain to reduce the required Eb/N0. The authors demonstrate a connection between spread spectrum and coding by considering the analysis of the multiple access interference in an FH system. View full abstract»

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  • Envelope, phase and data-transmission characterization for mobile radio channels at UHF frequencies

    Publication Year: 1992 , Page(s): 175 - 182
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    Presents results of envelope, phase and data-transmission measurements for mobile radio transmissions in the 900 MHz band as well as statistical characterization of the channel-envelope and phase behaviour, of the effect of space diversity, and modeling of error sequences experienced with 20 kb/s BPSK and 10 kb/s differential phase-shift keying (DPSK) data transmission. All experiments were conducted in medium-sized cities, namely Quebec City and Ottawa, and the results show evidence in most cases of a main or direct component superimposed on the multipath components, as is typical of a Rice channel, rather than the fully random behaviour of Rayleigh channels. Actual recordings of the error sequences indicate that the error-generation process is well characterized by Fritchman's channel model consisting of two to four error-free states and a single error state, and the authors conclude by presenting typical values of Fritchman parameters as a function of different values of the mean error rate. View full abstract»

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  • On the validity of the slow and moderate fading models for matched filter detection of Rayleigh fading signals

    Publication Year: 1992 , Page(s): 183 - 189
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    Published analyses of data transmission on flat fading channels often assume that the pulses arrive without distortion, and that random amplitude and phase are applied on a per-pulse basis. In reality, however, multiplicative distortion in the channel operates over each pulse. If the receiver uses a matched filter, an error floor results even for isolated pulse transmission. The author examines the effect systematically. By obtaining the error floor as a function of fade rate and pulse roll-off, he defines the limits, or `safe zone,' of the distortion-free approximation, which is here termed the moderate fading model. The results should be of interest to those working in modelling and analysis of fast fading channels. View full abstract»

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  • Call for papers

    Publication Year: 1992 , Page(s): 190
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  • [Back inside cover]

    Publication Year: 1992 , Page(s): c3
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  • [Back cover - [advertisement]]

    Publication Year: 1992 , Page(s): c4
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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