1991 Sixth International Conference on Mobile Radio and Personal Communications

9-11 Dec 1991

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Displaying Results 1 - 25 of 51
  • The performance of DECT in the outdoor 1.8 GHZ radio channel

    Publication Year: 1991, Page(s):300 - 307
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (612 KB)

    The authors looks at the application of the DECT standard to outdoor public access systems (e.g. cordless access and telepoint) and the technical issues raised by its deployment in outdoor environments. They aim to fully characterise propagation conditions in a typical telepoint area and then to accurately predict the DECT link performance for such an environment. Conclusions are drawn as to the m... View full abstract»

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  • Facsimile group 3, a GSM PLMN service

    Publication Year: 1991, Page(s):163 - 166
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (196 KB)

    Facsimile is included in the portfolio of GSM services and is supported by ETSI recommendation 03:45 (by transparent data services), and ETSI recommendation 03:46 (by non-transparent data services). The facsimile group 3 communications protocol and its implementation are discussed View full abstract»

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  • Vertical propagation of radio signals in an eleven storey building at 144 MHz

    Publication Year: 1991, Page(s):83 - 86
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (204 KB)

    An experimental study of vertical propagation at 144 MHz in a multi-storey building is presented. The study is relevant both to roof satellite transponding systems and potential interference to the SARSAT system from a densely packed population of personal computers. The polarisation in the case of the first application has been found essentially random at least in the horizontal plane and an empi... View full abstract»

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  • Channel modelling and link simulation studies for the DECT test bed program

    Publication Year: 1991, Page(s):293 - 299
    Cited by:  Papers (23)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (388 KB)

    The DECT (Digital European Cordless Telephone) test bed is a collaborative DTI/SERC LINK project involving eight UK companies and two UK universities. The purpose of the test bed program is to validate the DECT specifications and investigate certain aspects of system performance through hardware trials. Two work packages were carried out at Leeds University for the program. The first was a channel... View full abstract»

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  • Average bit error rate for coherent detection in macro and micro cellular radio

    Publication Year: 1991, Page(s):241 - 247
    Cited by:  Papers (5)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (384 KB)

    The probability of bit error is investigated, taking account of propagation effects in macrocellular and microcellular networks, noise and multiple interferers. Coherent detection of BPSK, QPSK and BFSK is considered with combined log-normal shadowing and Rayleigh fading for macrocellular radio and combined log-normal shadowing and Rician fading for microcellular radio. The effect of interference ... View full abstract»

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  • Service and operation functional architecture for personal communications

    Publication Year: 1991, Page(s):212 - 217
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (328 KB)

    A definition of functions composing a personal communication network and their reference model are proposed. By defining four functions, personal communications services are classified. Alternatives of information flows among these functions are also examined. Then, a practical application of the reference model to a multi-network environment is discussed together with the information flows betwee... View full abstract»

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  • A spectrum efficient cellular base-station antenna architecture

    Publication Year: 1991, Page(s):272 - 279
    Cited by:  Patents (25)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (600 KB)

    A multiple beam adaptive base-station antenna is proposed to complement other solutions, such a spectrum efficient modulation, currently being developed to meet the proliferating demands for enhanced capacity in mobile communications. This novel approach employs an antenna array capable of resolving the angular distribution of the mobile users as seen at the base-station site, and then utilising t... View full abstract»

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  • Analysis of decision-aided DPSK in the presence of multipath fading

    Publication Year: 1991, Page(s):157 - 162
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (272 KB)

    A decision-aided DPSK receiver scheme is proposed, which can achieve channel equalization using data symbols alone (i.e. no additive reference information is required). It makes use of the fact that for a typical irreducible error rate of 1%, 99% of the received symbols are correctly demodulated. Using this information to remove the modulation from the incoming radio signal effectively results in ... View full abstract»

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  • Link control in terrestrial/satellite mobile communication systems

    Publication Year: 1991, Page(s):77 - 81
    Cited by:  Patents (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (484 KB)

    Algorithms and signalling requirements of procedures for link selection and handover are discussed, both for terrestrial and satellite land mobile communications. For terrestrial cellular systems the methods are well known in principle, it is argued that similar procedures could also be employed in satellite multi-beam systems. Choice of terrestrial or satellite links in integrated dual mode syste... View full abstract»

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  • MPSK TCM with imperfect phase reference

    Publication Year: 1991, Page(s):93 - 100
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (300 KB)

    The effect of a noisy carrier reference on MPSK trellis coded modulation (TCM) systems is studied for both the static and Rayleigh fading environments. Upper bounds for the error probability are presented for each case. Software and hardware simulation results are presented to show the tightness of these bounds View full abstract»

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  • Dynamic frequency sharing for radio-local area networks

    Publication Year: 1991, Page(s):286 - 292
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (388 KB)

    The authors first give a description of the graph theoretic multiple access (GTMA) scheme. The way in which resource allocation is made adaptive to demand is explained in detail. Next, an important enhancement to the original scheme, which is then called GTMA/DUS is presented, where DUS means dynamic updating scheme. The delay/throughput performance of an R-LAN utilising GTMA and GTMA/DUS is inves... View full abstract»

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  • A mixed voice and data protocol for digital cellular radio

    Publication Year: 1991, Page(s):108 - 114
    Cited by:  Papers (3)  |  Patents (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (412 KB)

    Examines several multiple access protocols to find a suitable packet transmission scheme for integrated voice and data services. The protocols which are examined are based on a TDMA frame and slot structure. Results are presented showing that PRMA (packet reservation multiple access) is a suitable option for the integrated voice and data services. This protocol provides lower speech packet loss an... View full abstract»

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  • Cellular radio-telephone simulator

    Publication Year: 1991, Page(s):121 - 125
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (256 KB)

    Describes the cellular radio-telephone simulator which is being enveloped at BNR Europe Limited (which incorporates STL) as part of a DTI LINK programme. In order to illustrate some of the features of the simulator, two forms of channel allocation strategy and power control are considered, and results are presented View full abstract»

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  • Improved adaptive Viterbi detectors for fast-varying mobile-radio channels

    Publication Year: 1991, Page(s):21 - 25
    Cited by:  Papers (1)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (312 KB)

    The use of adaptive Viterbi detectors on fast-varying mobile-radio channels is studied. The main objective is to propose two new methods that may significantly improve the performance of the detector. The first method is to use prediction to combat the inherent delay of the channel estimates. The second method is to use so-called leaky algorithms in the channel estimator. This will make the detect... View full abstract»

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  • A joint algorithm for receiver timing recovery and AFC [cellular radio]

    Publication Year: 1991, Page(s):25 - 30
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (316 KB)

    A combined automatic frequency control and timing recovery algorithm is discussed. This novel technique is easily implemented in sampled receivers. The algorithm requires only two samples per symbol for its operation, of the two samples, one is used for symbol decision. This technique is independent of the recovered symbols and can be applied to filtered linear modulated signals View full abstract»

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  • The application of 16APSK to mobile fading channels

    Publication Year: 1991, Page(s):233 - 240
    Cited by:  Papers (8)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (456 KB)

    Data transmission in the mobile environment is particularly susceptible to the distortion introduced by the propagating channel. The authors concentrated on 16APSK, which utilises two concentric 8-PSK rings to greatly simplify the process of differential reception. Both differentially encoded and differentially demodulated 16APSK are examined (16DEAPSK and 16DAPSK respectively) together with metho... View full abstract»

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  • Introducing personal communications in the developing countries: alternatives and issues

    Publication Year: 1991, Page(s):208 - 211
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (212 KB)

    In planning services in developing countries, the major issues that need to be tackled are: rapid technological growth, a large number of standards and regulatory/financial constraints. The authors touch upon the alternatives and various issues involved in introducing personal communication services in developing countries for both mobile communication and rural/remote area communication through f... View full abstract»

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  • Analysis of 1.8 GHz macrocell measurements for personal communications

    Publication Year: 1991, Page(s):191 - 196
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (312 KB)

    A study has been carried out with the following aims: To collect a large database of measured mobile radio field strengths, covering a wide variety of terrain and ground cover types; to compare the propagation characteristics at 1.8 GHz with those at 950 MHz; to investigate the behaviour of the mean field strength with distance from the transmitter; to investigate the statistics of `holes' in the ... View full abstract»

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  • Driver information systems-a new market?

    Publication Year: 1991, Page(s):267 - 271
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (300 KB)

    The author provides an overview of some of the key technological issues and market constraints affecting the growth of driver information and navigation systems in the short to medium term. He covers trends in relevant technologies, generic markets for driver information systems, technical constraints on product development, issues affecting user demand, directions of growth, and identifies some k... View full abstract»

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  • A multi-carrier amplifier for future mobile communications systems

    Publication Year: 1991, Page(s):151 - 156
    Cited by:  Papers (3)  |  Patents (3)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (292 KB)

    The goal of dynamic channel allocation has eluded cellular system designers and operators alike since the concept of cellular mobile communications first became a reality. The idea of virtually instantaneous frequency re-planning of selected parts (or even all) of a cellular network has obvious attractions and alone would justify the considerable efforts being invested by a number of organisations... View full abstract»

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  • Experimental results from the UK test-bed on the DCS1800 radio channel

    Publication Year: 1991, Page(s):9 - 15
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (304 KB)

    A collaborative LINK research project has been in progress since early 1990 to develop the DCS1800 test bed and use this equipment to investigate the radio path performance of a GSM-type TDMA system at 1.8 GHz. Prior to this programme, Orbitel possessed a 900 MHz digital cellular radio test-bed to verify the operation of the GSM system to be implemented throughout Europe. This test-bed was upgrade... View full abstract»

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  • An assessment of the performance of linearisation schemes in the Australian MOBILESAT system by simulation

    Publication Year: 1991, Page(s):74 - 76
    Cited by:  Papers (2)  |  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (204 KB)

    The modulation schemes specified for the Australian satellite to mobile service are QPSK and ABPSK. With necessary firing both of these schemes give non-constant envelope signals and hence if efficient, and consequently nonlinear, HPAs (high power amplifiers) are to be employed in the transceivers some form of linearisation must be used. Considering digital predistortion in particular, simulations... View full abstract»

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  • A DECT testbed for applications and services studies

    Publication Year: 1991, Page(s):308 - 315
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (636 KB)

    A testbed of for the DECT system has been constructed and the basic concepts of the DECT radio specification have been validated. The testbed is proving to be a flexible and valuable tool for developing applications and services View full abstract»

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  • A simulation of a GSM network with frequency hopping

    Publication Year: 1991, Page(s):167 - 174
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (340 KB)

    A simple mathematical model indicated that the potential advantages of hopping were considerable, so it was decided to develop a more sophisticated Monte Carlo simulation. In the process, some interesting results have been obtained which are equally applicable to non-hopping systems. As with any simulation, some simplifications must be made to reduce the complexity of the problem to a level that c... View full abstract»

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  • Aspects of combined coding and linear modulation and its application to future personal communication systems

    Publication Year: 1991, Page(s):87 - 92
    Cited by:  Patents (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract |PDF file iconPDF (272 KB)

    The possibility of applying MECLCs (M-ary error correcting line codes) in conjunction with SSB transmission and linear modulation schemes is examined. Such schemes are considered to be potentially of interest for future personal communication systems. A new class of error correcting codes with defined spectra was introduced; such codes provide error control as well as a null at DC and suppressed l... View full abstract»

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