IEEE 39th Vehicular Technology Conference

1-3 May 1989

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  • 39th IEEE Vehicular Technology Conference (IEEE Cat. No.89CH2739-1)

    Publication Year: 1989
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    Freely Available from IEEE
  • The performance of GTFM in a frequency-selective Rayleigh fading channel

    Publication Year: 1989, Page(s):878 - 883 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (513 KB)

    Generalized tamed frequency modulation (GTFM) is a bandwidth-efficient digital modulation technique suitable for use in land mobile radio systems. The authors examine the influence of both frequency-flat and frequency-selective Rayleigh fading on GTFM with discriminator detection. In addition, the effects of cochannel and adjacent channel interference are considered in the frequency-flat fading ch... View full abstract»

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  • Projecting the technological evolution of the private land mobile radio services

    Publication Year: 1989, Page(s):38 - 43 vol.1
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    The author briefly summarizes the difficulty of administering the rapidly evolving technology of private land mobile radio services, draws a distinction between the cellular and private land mobile regulatory and evolutionary environments, and identifies more efficient spectrum utilization as a major challenge for the private land mobile sector. A three-stage approach is described which would allo... View full abstract»

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  • On frequency radio (OFR) repeater as fade filler

    Publication Year: 1989, Page(s):528 - 531 vol.2
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (284 KB)

    The on-frequency radio repeater is proposed as a solution to the problem of filling in coverage holes in mobile (particularly portable) communications. The basic conceptual design of the OFR repeater is described; its limitations are discussed; and some of its typical applications (building coverage and outside fade filler) are noted View full abstract»

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  • DATAMOVIL: a practical implementation of TRADAMO mobile data transmission protocol

    Publication Year: 1989, Page(s):31 - 37 vol.1
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The DATAMOVIL system has been developed for use by security forces, computer-aided dispatchers, and wherever an application requires highly reliable voice and data communications for a mobile fleet. A protocol called TRADAMO has been implemented as a key part of this system. This mobile data transmission protocol is presented along with the ASIC (application-specific integrated circuit) that imple... View full abstract»

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  • Propagation considerations of low power cellular boosters and case histories

    Publication Year: 1989, Page(s):523 - 527 vol.2
    Cited by:  Papers (3)  |  Patents (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (528 KB)

    Booster site selection often has tighter constraints placed upon it than cell site selection. Low-power 800-MHz cellular boosters usually provide a 250 mW ERP (effective radiated power) and are located several miles from the donor cell site. Two propagation problems must be analyzed, the donor-to-booster path loss and the booster coverage contour. In either case, the typical propagation model (e.g... View full abstract»

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  • Data communications over private land mobile radio systems

    Publication Year: 1989, Page(s):26 - 30 vol.1
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    The CEPT (European Conference of Post and Telecommunications Administrations) has published a number of recommendations used for the type approval of land mobile radio equipment. One of these is Rec. T/R 24-01. The author presents recent work in this field, and more particularly work addressing the implementation of data communications on PMR (private mobile radio) frequencies. He presents some of... View full abstract»

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  • Performance of frame synchronization in automatic train control communications systems

    Publication Year: 1989, Page(s):517 - 522 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (444 KB)

    The performance of the 40 bit frame synchronization sequence adopted for ATCS (automatic train-control systems) is examined in detail. A general expression is derived for the probability of synchronization as a function of the bit error and erasure probability, the overlap n, and the number of bit errors/erasures which are tolerated in the frame sync word. The probability PD... View full abstract»

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  • MDT-new designs, architecture and latest advances

    Publication Year: 1989, Page(s):22 - 25 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (332 KB)

    The next generation of mobile data terminals (MDT) can incorporate a combination of modern packaging techniques, microcomputer hardware and software environments, and system architecture technologies. The authors explore a practical mixture of these advances as applied in MDT products and systems based on land-mobile radio. Emphasis is on advances in display technology, removable mass storage medi... View full abstract»

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  • Cummins electronic controls for heavy duty diesel engines

    Publication Year: 1989, Page(s):595 - 612 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1304 KB)

    Heavy-duty diesel engines with the PACE limited-authority electronic control are on the road in some quantity, while Cummins is also introducing the Electronically Controlled Injection full-authority system on its engines. The authors describe these engine controls and show how a family of products concept is resulting in a smooth introduction of this technology into the heavy-duty diesel-powered ... View full abstract»

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  • Advanced train control systems-a project management perspective

    Publication Year: 1989, Page(s):508 - 516 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (696 KB)

    A project management perspective of advanced computer systems is considered. The author covers the technological aspects of management applicable to advanced train-control project engineering processes, i.e., the knowledge and skills required by railroads to organize, plan, and manage advanced train-control-system projects. A practical approach and procedures that work within the existing organiza... View full abstract»

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  • Emergency and quick operational radio communications in Utah Power and Light Company's Deer Creek Coal Mine

    Publication Year: 1989, Page(s):383 - 397 vol.1
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1000 KB)

    An underground radio communications system has been developed and installed in the Deer Creek Coal Mine near Huntington, Utah. The minewide radio communications system provides emergency communications to mine personnel working along the face, belt lines, man and material entries, returns and designated escapeways. The system also provides quick communications between the surface monitoring center... View full abstract»

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  • On optimal detection of non-coherent trellis coded continuous phase modulation signals: discriminator detection

    Publication Year: 1989, Page(s):78 - 81 vol.1
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    A novel sequential decoder for trellis-coded signals, using discriminator detection, is proposed. The decoder is based on optimal detection principles and is able to eliminate the presence of click noise. Evaluation when applied on a simple trellis-coded scheme indicated improvements up to 5.4 dB. To accommodate various requirements of complexity, two different approaches to implement the decoder ... View full abstract»

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  • The effect of fading in mobile ALOHA radio communications

    Publication Year: 1989, Page(s):19 - 21 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (204 KB)

    The application of unslotted ALOHA to mobile communication systems is studied. In such systems, the terminal-to-base channel can undergo various types of fade such as shadowing (log-normal fading) or unshadowed multipath reflections with a direct component (Rician fading), or the near/far effect. It is shown that fading may give rise to a capture effect that improves the ALOHA throughput View full abstract»

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  • Effect of correlation on a mobile radio maximal ratio diversity combiner for CPM with multiple interfering signals

    Publication Year: 1989, Page(s):452 - 457 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    The authors introduce an algorithm to evaluate the error probability over Gaussian and Rayleigh fading channels for continuous phase modulation (CPM) with multiple interfering signals using MSK (minimum-shift keying)-type receivers. The error performance associated with space diversity for the ideal MRC (maximal ratio combining) technique is examined. The diversity combining technique, even with o... View full abstract»

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  • Powertrain sensors and actuators: driving toward optimized vehicle performance

    Publication Year: 1989, Page(s):574 - 594 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (1276 KB)

    The past background, present status, and future prospects are examined for powertrain sensors and actuators. It is noted that success in automotive electronics, especially powertrain electronics, will be predicated upon meeting stringent measures of quality, cost effectiveness, and size, while increasing the number of functions processed. As sensors and actuators become more sophisticated, additio... View full abstract»

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  • Computer investigation of telephone-traffic capacity for cellular mobile radio systems

    Publication Year: 1989, Page(s):504 - 507 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    The authors provide tools for the investigation of the telephone-traffic capacity of cellular mobile systems with fixed, dynamic, and hybrid channel assignment schemes. The basic objectives considered in developing the tools are simplicity and ease of use, so that they can be of help to a wide audience of mobile radio engineers. For this purpose, a simple model of a cellular system is defined, and... View full abstract»

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  • Radio in the London Underground

    Publication Year: 1989, Page(s):375 - 382 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (500 KB)

    The London Underground has had a single-channel radio system in service for over a decade. This is now being upgraded by the addition of further channels to serve police, fire and ancillary services. The stations, some of them very deep, also have to be fully covered. Those channels requiring universal cover must be in complete synchronism throughout, while the cover of others must be restricted t... View full abstract»

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  • Phase locked transparent tone-in-band: an analysis [mobile radio]

    Publication Year: 1989, Page(s):73 - 77 vol.1
    Cited by:  Papers (3)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The locking mechanism for transparent tone-in-band (TTIB) was analyzed. The major issue addressed was the phase error in recombining the subbands, especially when phase-lock is applied to data. The effect on BER (bit error rate) performance was evaluated, and it was demonstrated that the phase error φ should be held to 0.1 radians or less if degradation is not to exceed 1 db. The most signific... View full abstract»

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  • A high efficiency 835 MHz linear power amplifier for digital cellular telephony

    Publication Year: 1989, Page(s):17 - 18 vol.1
    Cited by:  Papers (18)  |  Patents (16)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (120 KB)

    The authors describe an approach to linear power amplification for digital cellular telephony which exploits the high efficiency of a class-C amplifier. An average efficiency exceeding 50%, with third-order intermodulation products 30 dB down, has been demonstrated. Low cost, moderate complexity, conventional RF technology was used in the amplifier circuitry. A block diagram of the 835 MHz linear ... View full abstract»

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  • Correlation properties of antenna diversity in indoor mobile communication environments

    Publication Year: 1989, Page(s):446 - 451 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The correlation properties of polarization diversity in indoor environments are investigated theoretically and experimentally. A statistical distribution model of incident waves which is uniform in azimuth and Gaussian in elevation is assumed and typical correlation characteristics of cross dipole antennas are described theoretically. The values for the propagation parameters which provide for low... View full abstract»

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  • Multichannel VHF, UHF and 800 MHz subway radio communications tests in Toronto

    Publication Year: 1989, Page(s):839 - 845 vol.2
    Cited by:  Papers (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (692 KB)

    The Toronto Transit Commission (TTC) conducted a world-wide study of subway radio communications suitable for accommodating numerous VHF, UHF, and 800-MHz channels used by the transit system, police, fire and other public safety entities. No operating systems were found that met all of the requirements, but technology and products were available that appeared to be suitable. A 3060 ft section of t... View full abstract»

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  • Performance evaluation of a fading estimation/cancellation receiver for trellis coded CPM signals

    Publication Year: 1989, Page(s):101 - 105 vol.1
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (308 KB)

    The authors study the application of a fading estimation/cancellation method to trellis-coded continuous phase modulation (TC-CPM) schemes. Based on the maximum likelihood ratio test (MLRT), they derive two algorithms that cancel the effects of nonselective, multiplicative fading from MSK-type (minimum-shift-keying) signals. The first one is an extension of an algorithm presented previously by the... View full abstract»

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  • The next step in automotive electronic control

    Publication Year: 1989, Page(s):567 - 573 vol.2
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (504 KB)

    A man-machine integrated control system is presented as the next step in automotive electronic control. In this connection, it is necessary to study ways of managing vehicle dynamics and human factors. To improve the relationship between the driver's perceptions and vehicle motion, a subjective control system with a humanlike processor is expected to play a large role instead of the conventional o... View full abstract»

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  • Quality antenna site management [land mobile radio]

    Publication Year: 1989, Page(s):195 - 200 vol.1
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    The author provides a fairly nontechnical portrayal of his experience in managing an antenna site in Jacksonville. The company's strategy to achieve business success through quality is outlined. The following elements of the strategy are described in detail: (1) premium site, (2) master antenna system, (3) quality installation, (4) resident site manager, and (5) control of interference View full abstract»

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