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Vehicular Technology Conference, 1988, IEEE 38th

Date 15-17 June 1988

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Displaying Results 1 - 25 of 124
  • 38th IEEE Vehicular Technology Conference: 'Telecommunications Freedom - Technology on the Move' (Cat. No.88CH2622-9)

    Publication Year: 1988
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    Freely Available from IEEE
  • Queueing performance of voice-data frequency hopping networks with backoff

    Publication Year: 1988, Page(s):305 - 311
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (491 KB)

    A cellular FH/MFSK spread-spectrum mobile network with a total bandwidth in each cell of 2*W/sub ss/ is considered. There are two nonoverlapping channels within each cell, uplink and downlink, each with a bandwidth of W/sub ss/. The uplink channel handles information from the mobile units to the cell base station and the downlink channel directs information from the cell base station to the mobile... View full abstract»

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  • Managing cellular networks in the 1990s

    Publication Year: 1988
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    Summary form only given, as follows. The cellular phone business began barely five years ago with first generation systems in the 30 major metropolitan areas. These early systems consisted of a number of cell sites grouped around the local MTSO. They were frequently managed by inexperienced teams that found rudimentary ways to support operations, administration, and maintenance either manually or ... View full abstract»

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  • Operations tools for managing cellular networks

    Publication Year: 1988
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    Summary form only given, as follows. First-generation operation support tools for cellular networks were developed quickly by many different organizations to fill a void. While they fulfilled a need they were usually stand-alone tools, cumbersome, expensive to install and maintain, and had crude user interfaces. They required a skilled operator and produced results that were difficult to interpret... View full abstract»

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  • Networking-a key to the success of cellular

    Publication Year: 1988
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    Summary form only given. as follows, Networking of cellular switches or the ability to build area-wide or country-wide systems have proven to be one of the key factors of success in the penetration of cellular. Experiences of cellular networking, internationally and nationally, are reported. The use of the coming EIA standards and the evolution of cellular into a part of the intelligent telephone ... View full abstract»

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  • A microprocessor based route interlocking system for control of trains in railway yards

    Publication Year: 1988, Page(s):680 - 681
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (58 KB)

    Summary form only given. The design and development of a real-time control system called FIRM (fail safe interlocking system for railways using microprocessors) for control of trains in a station yard are considered. Route interlocking is described as a critical application involving human safety. The design is based on fail-safe principles where a fault in the system causes a safe reaction. An ap... View full abstract»

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  • Dynamic power control for FM channel management (cellular radio)

    Publication Year: 1988
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    Summary form only given, as follows. Dynamic power control is a technique that can be used in cellular radio systems to improve the quality of a call by dynamically managing the signal levels received by the subscriber unit and cell site during the routine progress of the call. An algorithm is described that is both easy to implement and works well in controlling the two major sources of degraded ... View full abstract»

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  • Probability of error analysis of digital partial response continuous phase modulation with discriminator detection in mobile radio channels

    Publication Year: 1988, Page(s):697 - 699
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (73 KB)

    Summary form only given. Future mobile radio systems are expected to provide high-quality voice and high-speed data transmission and to be integrated into the digital communication networks in several countries. The performance of some digital modulation techniques that are relevant for future mobile radio systems is studied. These techniques are characterized by having a constant envelope signal ... View full abstract»

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  • A Gilbert-like model for the mobile radio channel

    Publication Year: 1988
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (31 KB)

    Summary form only given, as follows. A novel approach to coding channel synthesis is proposed for the mobile radio channel, under the assumption that the system performance (i.e. P/sub e/ vs. SNR) in the absence of fading is known in advance. As an example the case of CPM with noncoherent demodulation is considered. On the basis of the P/sub e/-vs.-SNR curve, taking into account the threshold effe... View full abstract»

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  • Error-free high-speed data transmission protocol simultaneously applicable to both wire and mobile radio channels

    Publication Year: 1988, Page(s):489 - 496
    Cited by:  Papers (3)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (324 KB)

    The authors describe an integrated mobile communications traffic analysis of voice, data and image by a cellular mobile telephone system. They report the results of lost-call and simulation analysis under various traffic conditions. A newly developed universal protocol, an ARQ-based protocol adapted for land data transmission, is considered, along with an forward error correction (FEC)-based proto... View full abstract»

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  • Linear transceiver architectures

    Publication Year: 1988, Page(s):478 - 484
    Cited by:  Papers (32)  |  Patents (23)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (476 KB)

    Work in progress associated with developing advanced mobile transceivers is reported. The goal is to produce efficient compact data-compatible systems. Several methods under investigation are described, including the use of digital signal processing View full abstract»

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  • The design of an all digital phase-locked loop

    Publication Year: 1988, Page(s):471 - 477
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    A method for synthesizing an all digital phase-locked loop is proposed. The design is based on the digitization of a continuous system whereby the s-plane poles and zeros of a specified differential equation are mapped to the z-plane poles and zeros of a corresponding difference equation using the matched z-transform method. The critical parameters are specified and their influence on loop perform... View full abstract»

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  • NTT's multi-beam mobile satellite communication system

    Publication Year: 1988, Page(s):689 - 691
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (128 KB)

    Multibeam satellite communications system are being studied as the basis of an economical mobile satellite communication system. Design objectives of the multibeam satellite system, system applications to the mobile communication system, and experiment programs to implement a domestic commercial mobile satellite communications system are reported View full abstract»

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  • Performance of an adaptive multipath diversity receiver in a frequency selective Rayleigh fading channel

    Publication Year: 1988, Page(s):351 - 357
    Cited by:  Papers (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (436 KB)

    The performance of an adaptive multipath diversity receiver, operating in a quasi-static frequency selective Rayleigh fading channel, is considered. Phase coded direct sequence spread spectrum signaling is used. The receiver formulation is presented as an extension of a previously derived result by the authors (1988). Probability-of-error expressions are presented for channels with uniform and non... View full abstract»

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  • Front end filter design for the newly acquired spectrum from the FCC

    Publication Year: 1988, Page(s):469 - 470
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (132 KB)

    The recent release by the US Federal Communications Commission (FCC) of additional spectrum for the use of cellular service has introduced some interference concerns. The frequency allocation is such that blocks of frequencies from each of the service providers will be embedded within the frequency spectrum of the other service provider. This presents a problem to the system designer to provide ad... View full abstract»

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  • A comparison of point-to-point computer aided radio propagation models with field test data

    Publication Year: 1988, Page(s):113 - 118
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (256 KB)

    Computer-aided methods for use in irregular terrain have been developed over the last several years to improve the accuracy of RF predictions. The authors consider point-to-point methods that use the actual terrain profile to compute path loss, considering single- or multi-edged knife diffraction. A comparison was made of field test data acquired at 450 MHz in Los Angeles County, California, with ... View full abstract»

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  • Reduction of cochannel interference in cellular systems by intra-zone channel reassignment and adaptive transmitter power control

    Publication Year: 1988, Page(s):668 - 672
    Cited by:  Papers (26)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (236 KB)

    In cellular radio systems, cochannel interference determines frequency reuse distance. To achieve high-capacity systems, cochannel interference reduction is considered a key item. Intrazone channel reassignment (IZCR) and adaptive transmitter power control (ATPC), are effective techniques to reduce cochannel interference. A novel IZCR algorithm is proposed that maximizes the number of channels tha... View full abstract»

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  • Solar-powered racing vehicle concept

    Publication Year: 1988, Page(s):687 - 688
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (92 KB)

    The first US solar race car to compete in a solar race, Tour de Sol, was Solectria III, which is described as an inexpensive, fairly simple vehicle that has the advantages of small size and light weight. The vehicle finished the race but was not competitive due to poor aerodynamics, low battery capacity and lack of efficient control system. Features of later, improved models are reported View full abstract»

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  • Performance analysis of mobile radio carrier sense multiple access

    Publication Year: 1988, Page(s):344 - 350
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (416 KB)

    A mobile communication system has been proposed in Japan that is based on decentralized base stations with autonomous radio link control (DCM system). In this DCM system, all base stations and mobile stations access a full-duplex control channel independently. Signals for location identification and registration are transmitted cyclically from base stations. A control channel access scheme for the... View full abstract»

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  • 16 channel dielectric transmitter multiplexer for cellular base stations

    Publication Year: 1988, Page(s):461 - 468
    Cited by:  Papers (1)  |  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (384 KB)

    A 16-channel transmitter multiplexer for a 800-MHz band cellular system base station is presented. This multiplexer is small and low cost, with high electrical performance. Dielectric TE01δ mode channel filters and a newly developed dielectric TM110 mode high-power antenna bandpass filter are used. The size of the multiplexer is W260×D225×H1600 mm... View full abstract»

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  • Power delay profiles measured in mountainous terrain [radiowave propagation]

    Publication Year: 1988, Page(s):105 - 112
    Cited by:  Papers (33)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (536 KB)

    Wideband mobile radio channel characteristics were measured in mountainous terrain in Switzerland. Based on more than 76000 impulse responses, measured with two different experimental set-ups, statistical results were evaluated for mean excess delay, delay spread, delay interval, and correlation distance. This data was used to define parameter settings for a frequency-selective fading simulator wi... View full abstract»

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  • Simulation of digital transmission in cellular mobile radio environment

    Publication Year: 1988, Page(s):530 - 536
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (512 KB)

    A simulation package has been developed for predicting the response of a cellular mobile radio channel to the transmission of narrow pulses. Four types of urban areas ranging from dense urban to suburban and three RF frequencies in the 0.5 to 3 GHz range are considered. These areas are geometrically modeled by a cellular pattern of hexagons making the model compatible with existing digital cellula... View full abstract»

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  • Interleaving for differential detection using multiple detectors

    Publication Year: 1988, Page(s):18 - 21
    Cited by:  Papers (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (188 KB)

    Using multiple differential detectors improves the performance of the differentially detected trellis-coded PSK (phase-shift keying). To achieve further improvements without increasing the receiver complexity considerably, the noise correlation must be reduced. For this purpose, a simple interleaver at the transmitter is proposed which permits the use of multiple differential detectors at the rece... View full abstract»

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  • An axle counting system for automatic signalling of trains

    Publication Year: 1988, Page(s):682 - 686
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (224 KB)

    A system of train detection is described which uses axle counting at two detection points, one at each end of the track section, imposing no special requirements on the railway track. These detection points are actuated by the wheels of the train, as many times as the number of axles in the train, and convey this information to a common electronic processing unit. The difference of the two counts ... View full abstract»

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  • Forecasting techniques in call hand-offs for cellular communication

    Publication Year: 1988, Page(s):340 - 343
    Cited by:  Papers (1)  |  Patents (3)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (220 KB)

    Among the most important features of a cellular communication system is its capability for serving each mobile station with appropriate quality regardless of the location of the vehicle. This requires adequate hand-off procedures for transferring in-course calls from one base station to another. The use of forecasting techniques is introduced so that a good hand-over can be expected. Different for... View full abstract»

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