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1989 Fifth International Conference on Mobile Radio and Personal Communications

11-14 Dec 1989

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Displaying Results 1 - 25 of 44
  • Novel antenna tracking mechanism for land mobile satellite terminals

    Publication Year: 1989, Page(s):182 - 186
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (296 KB)

    The current interest in land-mobile satellite terminals, using small tracking antennas, has prompted researchers at the University of Bristol, to investigate the applicability of the electronic beam squint (EBS) tracking technique to this environment. The preliminary findings of this investigation are presented. Two systems, are described, based on the EBS technique, which use both conventional wa... View full abstract»

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  • Cellular radio transmitter combiners for narrow co-channel spacing

    Publication Year: 1989, Page(s):57 - 59
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (156 KB)

    The use of selective cellular radio transmitter combiners in 900 MHz systems with 600 MHz spacing between channels is well established. The development of compact resonators is likely to overcome the problems that have been found in combining channels covering a total bandwidth greater than 8 MHz, since interconnecting cables between the resonators and throughlines can be significantly shorter. Th... View full abstract»

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  • A diversity combining adaptive antenna array for a land mobile satellite terminal

    Publication Year: 1989, Page(s):177 - 181
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (328 KB)

    The proposal for a diversity combining antenna array for a land mobile satellite (LMS) terminal is further examined by the authors. This novel approach employs established diversity combining techniques previously developed for mobile terrestrial radio. Here it is suggested that a diversity based receiver architecture would allow the coherent recombination of the multipath signal energy present at... View full abstract»

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  • Direct conversion linear transceiver design

    Publication Year: 1989, Page(s):53 - 56
    Cited by:  Papers (7)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (228 KB)

    Describes the implementation and performance of a prototype linear direct conversion transceiver unit, developed by the Centre for Communications Research at the University of Bristol. The transmitter and receiver system are based on the Weaver (1956) frequency translation technique. This method was chosen for the property that the image products fall in the user's own channel, thus greatly reduci... View full abstract»

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  • Path loss and signal variability analysis for microcells

    Publication Year: 1989, Page(s):38 - 42
    Cited by:  Papers (11)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (272 KB)

    For the successful implementation of microcellular systems it is essential that planning tools are available which can accurately predict the service coverage provided from a potential base site. This obviously relies on a fundamental understanding of the signal propagation mechanism and the resulting channel characteristics. Some measurements and initial theory which help to provide an insight in... View full abstract»

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  • The provision of GSM cellular radio environments within passenger aircraft operating over Europe

    Publication Year: 1989, Page(s):172 - 176
    Cited by:  Patents (38)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    The author describes the findings of a feasibility study into the means of provision of a GSM cellular radio environment inside passenger aircraft. The background and capacity estimates for such a system are discussed prior to the presentation of a description of proposed system architecture. This description includes topics such as network organisation, handover, transmission delay compensation, ... View full abstract»

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  • The effect of delay spread on the BER performance of indoor personal communications systems

    Publication Year: 1989, Page(s):107 - 111
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (216 KB)

    There is increasing interest in providing local access to the public network by radio methods. A major problem is designing digital mobile personal radio systems arises from radio propagation effects, which may significantly impair the overall transmission quality through intersymbol interference (ISI), and restrict the data transmission rate. The characteristics of the mobile multipath channel va... View full abstract»

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  • Spectral considerations for time division duplex CPM with application to future personal communications

    Publication Year: 1989, Page(s):137 - 141
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (212 KB)

    There is now very considerable emphasis on mobility in telecommunications with interest ranging from mobile radio through cordless telephony and aimed ultimately at the realisation of a flexible personal communicator providing a range of voice and data services. The need is clearly for a digital system, with anticipated high take up and utilisation bringing spectral and power efficiency to the for... View full abstract»

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  • On this use of Band I, 47-68 MHz for mobile radio

    Publication Year: 1989, Page(s):24 - 28
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (312 KB)

    Considers the way in which Band I may be used. The expected interference environment is characterised, and estimates of the likely interference levels due to the different existing mechanisms are obtained. This leads to examination of the impact on the performance of possible radio systems. Strategies are presented which may render the systems insensitive to the fluctuations in interference. Atten... View full abstract»

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  • Evaluation of paging by satellite

    Publication Year: 1989, Page(s):193 - 198
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (300 KB)

    Satellite based mobile services are in the early stages of their development and initial services will provide only low speed data, with medium grade voice communications to follow later. The authors describe a technical evaluation which was performed on an experimental satellite paging system. This system was configured for ease of implementation rather than for ultimate performance for the limit... View full abstract»

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  • Estimating service reliability in multiple interferer mobile radio systems

    Publication Year: 1989, Page(s):48 - 52
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (316 KB)

    Outage probability calculations are discussed as a method for estimating the reliability of reception in multiple interferer mobile radio systems in which the received signals suffer both `Rayleigh fading' and `lognormal shadowing'. Such calculations are particularly relevant to the design of cellular mobile radio systems. The use of selection diversity to improve the service reliability is also c... View full abstract»

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  • Applications of minimum-phase signals in mobile radio services

    Publication Year: 1989, Page(s):147 - 151
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (196 KB)

    A reduced bandwidth minimum-phase modulation scheme has been described which can be used for mobile radio services. The proposed scheme offers bandwidth economy equivalent to that of conventional SSB. Also, during periods of low modulation depths, simple envelope detectors can be used with negligibly small demodulation distortion. It has been shown that envelope distortion increases gradually with... View full abstract»

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  • 900 MHz attenuation and bit error ratio measurements inside a modern office building

    Publication Year: 1989, Page(s):33 - 37
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (268 KB)

    Results for signal level and bit error ratio (BER) measurements at 905.15 MHz for a modern two storey office building with externally located base station are presented. The main thrust for these experiments was to establish the radiowave propagation characteristics in order to specify handover criteria for outdoor to indoor environments. The authors noted that there were large variations in signa... View full abstract»

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  • UK telepoint common air interface

    Publication Year: 1989, Page(s):157 - 161
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (208 KB)

    MPT1375, the UK common air interface (CAI) specification for the second generation of cordless telephones (CT2), represents a synthesis of ideas from a number of UK companies and some from continental Europe. Although triggered by the needs of the telepoint service, the CAI is fully featured for two-way communication. The present telepoint service offers only outgoing calls, but the CAI also allow... View full abstract»

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  • Some factors which affect the traffic capacity of a small telepoint network

    Publication Year: 1989, Page(s):167 - 171
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    A computer model is used to study the affect of several interference related factors, on the traffic capacity of a small telepoint network based on UK CT2. For small service areas, it is found that the traffic capacity may be limited by receiver intermodulation performance. Handset power control can be beneficial in such cases. Dual antenna diversity was found to give an increased capacity for all... View full abstract»

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  • Electronically reconfigurable cellular radio multicouplers

    Publication Year: 1989, Page(s):103 - 106
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (136 KB)

    The use of frequency agile transmitters is considered advantageous in two different contexts, namely frequency hopping to combat fading in digital cellular systems, and dynamic frequency assignment to increase efficiency in analogue systems. It is believed that the transmitter combiners remain the only section of the hardware system requiring attention in practical realization of such schemes, if ... View full abstract»

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  • The potential for new technology in mobile portable radio

    Publication Year: 1989, Page(s):99 - 102
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (196 KB)

    Briefly describes some of the advantages to be gained by including new silicon, GaAs and interconnection technology in radio communication systems. The emphasis on the `radio' rather than signal processing aspects, but some indications of possibilities in the latter field are included View full abstract»

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  • Digital European Telecommunications system simulation performance results

    Publication Year: 1989, Page(s):132 - 136
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (240 KB)

    Within Europe, the Digital European Cordless Telecommunications system, DECT, is currently being defined as a standard for cordless telephony and higher bit rate cordless nonvoice services. Working assumptions for the radio air interface have been refined over this past year, but many aspects of the specification, particularly relating to network and protocol issues remain to be defined. As part o... View full abstract»

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  • Queueing delay in a microcellular mobile radio base station interconnecting network

    Publication Year: 1989, Page(s):89 - 93
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (256 KB)

    An essential part of any cellular mobile radio, but one which does not receive a great deal of attention, is the cable network linking the base stations (BS) to the mobile switching centres (MSC). In the case of digital microcellular systems the design of this network is likely to become a crucial element in determining the viability of such systems, because of the greater number of BSs which woul... View full abstract»

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  • Performance study of the transmission of image data to mobile terminals

    Publication Year: 1989, Page(s):122 - 126
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (444 KB)

    Reports the performance evaluation of transmitted basic line diagram graphic images, such as street maps and building plans, over a digital mobile radio channel at data rates of 2400 bits/s and 4800 bits/s. A low bit-rate source code is used to represent line diagram images. The characteristics and error analysis of the fading channel have been evaluated by computer simulation. Subjective tests ha... View full abstract»

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  • A local area position location system

    Publication Year: 1989, Page(s):79 - 83
    Cited by:  Papers (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (248 KB)

    An automatic position and control (APAC) system is being developed using hyperbolic radio position location methods. The system provides near real time three dimensional position information within a local area for navigation and control use. The system has applications in construction automation, autonomous guided vehicle control, industrial safety, automatic vehicle location in metropolitan area... View full abstract»

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  • Performance analysis of time-frequency coded spread spectrum systems (TFCSS) and multi-level frequency shift keyed frequency hopped (MFSK/FH) multiple access systems

    Publication Year: 1989, Page(s):20 - 23
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (176 KB)

    During the late seventies, as a result of the increased interest in applying new techniques to mobile radio systems, two different spread spectrum multiple-access systems were proposed, which apparently rivaled contemporary FDM/TDM techniques in performance. The first, more conventional system, was proposed by Cooper and Nettledon (1978), and used binary differential phase shift keying and Hadamar... View full abstract»

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  • Service provision to land mobile radio units in northern latitudes by a satellite in a non-geostationary orbit-propagation studies

    Publication Year: 1989, Page(s):187 - 192
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (332 KB)

    To date, systems design engineers have been hindered by a lack of information about the nature of the radio channel offered to a mobile unit at L-band by a highly inclined orbit (HIO) satellite. A research project was initiated by the radiocommunications division of the Department of Trade and Industry (DTI) and placed with the University of Bradford as a means of obtaining the required data. The ... View full abstract»

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  • Assessment of UHF power amplifier linearisation by measurement and simulation

    Publication Year: 1989, Page(s):60 - 64
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (284 KB)

    Most communication system simulator programs use complex envelope signal representation. The particular program considered and used in the work is SIGNALS. This general system simulator program works in the time domain. A nonlinear model for inclusion in such a program must operate on time samples of the complex envelope waveforms of the signals. Volterra series is a general nonlinear model. A Vol... View full abstract»

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  • Direction of arrival and frequency response measurements at UHF

    Publication Year: 1989, Page(s):43 - 47
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (260 KB)

    In land mobile radio systems the signal at a mobile receiver is usually the sum of a number of multipath components. The time delay spread of the multipath signal has been measured in many situations. These measurements show that the multipath time delay spread profile often contains significant discrete components. The paper compares the direction of arrival measurements (at 870 Mhz) with the fre... View full abstract»

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