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Vehicular Technology Conference, 1989, IEEE 39th

Date 1-3 May 1989

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Displaying Results 1 - 25 of 141
  • 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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  • International standards for personal communications

    Publication Year: 1989, Page(s):722 - 728 vol.2
    Cited by:  Papers (14)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (568 KB)

    Personal communications is defined as a service concept which will evolve from existing radio-based services such as cellular, cordless, paging, etc., and will use existing and planned fixed and mobile infrastructures to the greatest extent practicable. The author outlines some of the international standards work in this area currently being carried out by CCIR/CCITT, in particular, that of CCIR I... View full abstract»

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  • Signaling protocol architecture for digital mobile system

    Publication Year: 1989, Page(s):729 - 734 vol.2
    Cited by:  Papers (6)  |  Patents (5)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    The authors consider a signaling protocol architecture for future digital mobile user-network interfaces which can support a wide range of services similar to the ones defined in ISDN (integrated services digital network). This architecture is based on the Open Systems Interconnection (OSI) Reference Model. The interfaces proposed support ISDN functions and public land mobile network (PLMN) functi... View full abstract»

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  • Electronic beam squint tracking for land mobile satellite terminals

    Publication Year: 1989, Page(s):735 - 741 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (452 KB)

    Preliminary results from an investigation of the applicability of the electronic beam squint (EBS) tracking technique to land mobile satellite terminals. Two systems are described, based on the EBS technique, which use both conventional waveguide and phased-array technology. Results are presented covering the error-detection capabilities of the systems, along with some operational analysis to illu... View full abstract»

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  • A radio communications system for the English Channel Tunnel

    Publication Year: 1989, Page(s):368 - 374 vol.1
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (468 KB)

    The authors describe the 2-way, 42-channel VHF radio communications system supporting the construction activities of the English Channel Tunnel. The system was designed to use radiating coaxial cable and bidirectional repeater line amplifiers as the principal signal distribution scheme. Attention is given to signal distribution, channelization, frequency reuse methods, signaling schemes, and the a... View full abstract»

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  • Tracking receiver design for the electronic beam squint tracking system in the mobile environment

    Publication Year: 1989, Page(s):742 - 748 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The authors investigate the beam squint technique from the viewpoint of the tracking receiver in a mobile satellite environment, together with the more general problems experienced by tracking receivers in this situation. This technique is detailed with particular reference to the design and characterization of an optimum tracking receiver, and the new problems which the system poses in this area.... View full abstract»

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  • Channel assignment in cellular radio

    Publication Year: 1989, Page(s):846 - 850 vol.2
    Cited by:  Papers (98)  |  Patents (19)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (312 KB)

    Some heuristic channel-assignment algorithms for cellular systems are described. These algorithms have yielded optimal, or near-optimal assignments, in many cases. The channel-assignment problem can be viewed as a generalized graph-coloring problem, and these algorithms have been developed, in part, by suitably adapting some of the ideas previously introduced in heuristic graph-coloring algorithms... View full abstract»

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  • A high capacity assignment method for cellular mobile telephone systems

    Publication Year: 1989, Page(s):359 - 367 vol.1
    Cited by:  Papers (58)  |  Patents (6)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (596 KB)

    The authors describe a channel assignment scheme for cellular mobile telephone systems in which assignment is based on actual field strength measurements performed dynamically on the functioning system. The scheme involves no rigid partitioning of the channel set into geographic patterns, as in conventional systems. A mutual interference criterion is applied to ensure that satisfactory service is ... View full abstract»

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  • Transmitter diversity effect with dispersal oscillators for digital mobile radio

    Publication Year: 1989, Page(s):474 - 481 vol.2
    Cited by:  Papers (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (572 KB)

    The dispersed-carrier-wave format is proposed for the execution of simultaneous multistation transmission for mobile communications. Signals are transmitted by modulating the carrier wave, which is frequency-modulated by sinusoidal waves. The diversity effects of this format were calculated, and the results were confirmed for the case of simultaneous two-station transmission. In cellular zone syst... View full abstract»

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  • Experimental investigation of 1.5 GHz, 2.3 GHz and 2.6 GHz band land mobile radio propagation in urban and rural areas

    Publication Year: 1989, Page(s):311 - 315 vol.1
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (328 KB)

    Urban measurements were carried out in the Tokyo metropolitan area and rural measurements in the Hiraiso region. Radio propagation loss was measured at 2 cm intervals along the measuring routes, and median propagation losses in the three frequency bands was compared. In the urban experiment, the influence of obstacles on median values of radio propagation loss is almost the same in the three frequ... View full abstract»

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  • Design aspects and performance evaluation of ATCS mobile data link

    Publication Year: 1989, Page(s):860 - 867 vol.2
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (432 KB)

    The Mobile Data Link (MDL) System for the North American Advanced Train Control System (ATCS) is proposed and analyzed with respect to the ATCS preliminary requirements. Design aspects of mobile data radios are discussed to point out the hardware limitations due to DOC (US Department of Communications) and FCC (US Federal Communications Commission) regulations and technologies. The propagation cha... View full abstract»

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  • Optimum pre-emphasis for FM transmission with frequency-domain voice scrambling

    Publication Year: 1989, Page(s):206 - 211 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (376 KB)

    Optimum pre- and de-emphasis are theoretically investigated for FM and PM transmission, including frequency-domain scrambling for voice security. Using a linear system model, the optimum frequency characteristics for pre- and de-emphasis filters are given as functions of the voice signal spectrum, demodulator output noise spectrum, and the scrambling method. Comparisons of the maximum attainable S... View full abstract»

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  • Frequency common use between indoor and urban cellular radio-research on frequency channel doubly reused cellular system

    Publication Year: 1989, Page(s):329 - 335 vol.1
    Cited by:  Papers (4)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (372 KB)

    To enhance the utility of portable telephone sets, a novel approach is proposed whereby an indoor radio PBX (private branch exchange) reuses frequency channels of an urban cellular radio without using additional frequency resources. The relation between microcell radius and antenna power of the indoor system in the presence of cochannel mutual interferences is shown. Calculations demonstrate that ... View full abstract»

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  • Propagation characteristics in land mobile satellite systems

    Publication Year: 1989, Page(s):550 - 556 vol.2
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (392 KB)

    A description is given of experiments on land mobile satellite systems carried out with the Engineering Test Satellite-V (ETS-V) at 1.6 and 1.5 GHz. Typical propagation characteristics observed, a received power distribution measured in a local area, and estimation methods for received signal variations caused by a building and a single tree are described. It is shown that the shadowing effects of... View full abstract»

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  • The systems design approach (better late than not at all) [automotive electronics]

    Publication Year: 1989, Page(s):401 - 412 vol.1
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    The systems design approach (SDA), an emerging concept for the automotive industry, considers the total vehicle as one system vs. the result of a grouping of optimized components. The systems process begins with a complete definition of the system requirements, is followed by the examination of technologies, generation of alternatives, and selection of a design to satisfy those requirements, and c... View full abstract»

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  • Supervision and control in cellular systems

    Publication Year: 1989, Page(s):819 - 822 vol.2
    Cited by:  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (268 KB)

    The necessity for a novel cellular supervision and control system is described from two points of view. The first view is that increasing service complexity and customer demands are forcing the creation of a supervision and control system that will apply a common database and a unified approach to network management. The other point of view is that a supervision and control system should have impr... View full abstract»

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  • Data communications over private land mobile radio systems

    Publication Year: 1989, Page(s):26 - 30 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (356 KB)

    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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  • Design and implementation of a channel simulator for wideband mobile radio transmission

    Publication Year: 1989, Page(s):652 - 655 vol.2
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (316 KB)

    The authors present the practical design and implementation of a channel simulator for wideband (up to 10 MHz) mobile radio transmissions. The simulator is intended to be used for laboratory tests on high-bit-rate and spread-spectrum transmissions. Rician and Rayleigh frequency-selective fading is simulated by feeding four flat Rayleigh-fading simulator branches through the different taps of a SAW... View full abstract»

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  • Considerations on the mobile radio system architecture

    Publication Year: 1989, Page(s):708 - 712 vol.2
    Cited by:  Papers (8)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (388 KB)

    A basic architecture for a mobile radio network providing novel services and accommodating increasing subscribers is given. Three kinds of functional modules (mobility management, RF-transmission management, and call control) are introduced to facilitate system expansion, and examples of network architecture are shown. Functions and structures of information, control, and housekeeping channels are... View full abstract»

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  • Signaling and data transmission in a digital cellular system

    Publication Year: 1989, Page(s):893 - 896 vol.2
    Cited by:  Papers (1)  |  Patents (1)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (288 KB)

    The authors present block-error rates for the transmission of data in a single time slot of a 30 kHz TDMA (time-division multiple-access) channel. As expected, the transmission of 4800 b/s data is more robust than that of 9600 b/s data, due to the increased number of available coding bits. For both cases, the use of proper interleaving will provide a significant increase in performance. At higher ... View full abstract»

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  • Narrow-band FM transmission in land mobile radio

    Publication Year: 1989, Page(s):336 - 340 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (264 KB)

    The authors describe the narrow-band mobile radio transmission technologies used in NTT's High-Capacity Land Mobile Communications System. These include 12.5 kHz-band analog FM transmission for voice; 2400 b/s data transmission for access and paging control; 100 b/s data transmission for channel associated control; and enhanced cellular technologies such as diversity reception, adaptive transmitte... View full abstract»

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  • MSAT: mobile communications throughout North America

    Publication Year: 1989, Page(s):557 - 562 vol.2
    Cited by:  Papers (7)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (492 KB)

    The first regional Mobile Satellite Service (MSS) system, MSAT, is intended to provide diverse mobile communications services (including voice, data, and position location), to mobiles on land, waterways, and in the air. The author outlines the institutional relationships between organizations participating in MSAT, including private corporations and government agencies. He also reviews the regula... View full abstract»

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  • A comparison of CDMA and NPCSMA for an indoor data network

    Publication Year: 1989, Page(s):767 - 773 vol.2
    Cited by:  Patents (2)
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (420 KB)

    An indoor communication system using direct-sequence spread-spectrum signaling is considered. CDMA (code-division multiple-access) and NPCSMA (nonpersistent carrier-sense multiple-access) are considered as multiple-access alternatives and are compared based on their throughput and delay characteristics. The advantage of multipath diversity is illustrated. For NPCSMA and CDMA, delay and code length... View full abstract»

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  • BER improvement of PRCPM in mobile radio channels with discriminator detection using decision feedback equalization

    Publication Year: 1989, Page(s):237 - 242 vol.1
    Request permission for commercial reuse | Click to expandAbstract | PDF file iconPDF (304 KB)

    The improvement of the bit-error rate (BER) performance of partial response continuous phase modulation (PRCPM) in mobile radio channels by using decision feedback equalization to cancel the ISI (intersymbol interference) of one adjacent bit is theoretically investigated. Closed form expressions for the average probability of error in fast fading are derived for discriminator detection with decisi... View full abstract»

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