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# 1991 Sixth International Conference on Mobile Radio and Personal Communications

## Filter Results

Displaying Results 1 - 25 of 51
• ### A simulation of a GSM network with frequency hopping

Publication Year: 1991, Page(s):167 - 174
Cited by:  Patents (1)
| | PDF (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»

• ### Facsimile group 3, a GSM PLMN service

Publication Year: 1991, Page(s):163 - 166
| | PDF (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»

• ### Effect of dispersive fading channels on block coded modulation [mobile radio]

Publication Year: 1991, Page(s):39 - 44
| | PDF (284 KB)

Considers the effect of the mobile radio propagation environment on the distance structure of a block coded modulation scheme and discusses the implications on bit error rate performance. It is assumed that ideal equalisation is implemented, so that the combination of equaliser and decoder forms a maximum likelihood decoder for the code as transformed by the channel. Simulation results are present... View full abstract»

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

Publication Year: 1991, Page(s):157 - 162
Cited by:  Papers (2)
| | PDF (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»

Publication Year: 1991, Page(s):31 - 38
| | PDF (380 KB)

Quadrature amplitude modulation (QAM) for digital data transmission at 32 Mbits/s over mobile radio channels is considered. At this transmission rate intersymbol interference (ISI) will generally occur, causing problems in accurately recovering the received signal. The authors consider a novel QAM equalizer which gives the wideband system superior performance to the narrowband system by virtue of ... View full abstract»

• ### Simulation of man-made noise in 100 MHz to 3 GHz band

Publication Year: 1991, Page(s):255 - 260
| | PDF (336 KB)

The authors describe the physical nature of impulsive noise and its simulation. The RF part and digital part of the simulator are described. Man-made impulsive noise environments were simulated and output impulsive noise was measured using noise amplitude distribution (NAD) measuring equipment. The results were in excellent agreement with measured results. The simulator was used to assess the perf... View full abstract»

• ### A 1.8 GHz synthesiser for use in mobile radio

Publication Year: 1991, Page(s):136 - 142
Cited by:  Papers (1)
| | PDF (400 KB)

Presents the design of a synthesiser based on a single phase locked loop, and capable of output frequencies of over 2 GHz, aimed at the portable radio market. Experimental results are presented for a prototype unit demonstrating the success of techniques to reduce the levels of phase noise and sidebands. These techniques are outlined and the results are analysed in detail. A new circuit configurat... View full abstract»

Publication Year: 1991, Page(s):182 - 190
Cited by:  Papers (3)
| | PDF (320 KB)

First generation cellular radio systems are now failing to support the increased demand from all sectors of the public. The problem of congestion is at its most severe in dense urban areas such as city centres, and on some motorways. A promising idea that has the potential to provide a solution is the microcellular approach. The authors describe the development of a microcellular propagation model... View full abstract»

• ### A protocol for combining voice and data traffic on a trunked multichannel PMR system

Publication Year: 1991, Page(s):49 - 56
Cited by:  Papers (1)  |  Patents (1)
| | PDF (420 KB)

Discusses the design of a protocol in the family of idle-casting multiple access protocols for use in a multichannel private mobile radio environment. Network traffic is defined in terms of call and packet type traffic. The protocol uses packet reservation to integrate both call and packet traffic onto multiple narrowband channels. No special hardware is required and packet data can still be trans... View full abstract»

• ### Driver information systems-a new market?

Publication Year: 1991, Page(s):267 - 271
Cited by:  Papers (1)
| | PDF (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»

• ### A multi-carrier amplifier for future mobile communications systems

Publication Year: 1991, Page(s):151 - 156
Cited by:  Papers (3)  |  Patents (3)
| | PDF (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»

• ### Study into the use of search, vote and lock for Metropolitan Police personal radio systems

Publication Year: 1991, Page(s):197 - 202
| | PDF (296 KB)

The Metropolitan Police Service intends to replace its current VHF network of divisional and specialist personal radio systems with a network operating on UHF assignments. The re-engineering program involves over 10000 handheld radios and fixed equipment at over 400 sites. The authors reports on recent work carried out to assess the operational and engineering aspects concerned with achieving wide... View full abstract»

• ### Capacity improvement of CDMA systems using M-ary code shift keying

Publication Year: 1991, Page(s):63 - 67
Cited by:  Papers (8)  |  Patents (1)
| | PDF (236 KB)

A number of companies in the United States, such as QualComm, Millicom, and others, have proposed CDMA as a means of increasing the capacity of cellular systems, and have claimed that significant increases are possible. CDMA is not normally particularly bandwidth efficient. The author proposes the use of a technique called mCSK-not in itself novel-whereby its throughput may be increased significan... View full abstract»

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

Publication Year: 1991, Page(s):208 - 211
| | PDF (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»

• ### Performance evaluation of a UMTS in a urban environment

Publication Year: 1991, Page(s):218 - 224
Cited by:  Papers (1)
| | PDF (472 KB)

By means of a simulation programme comparisons were made between different channel allocation schemes and handover criteria in case of uniformly and nonuniformly distributed traffic. These comparisons were, performed in a typical macrocellular environment. Output parameters included statistical C/I distribution, handover rates and carried traffic. The authors present the main functional and archit... View full abstract»

• ### Dynamic frequency sharing for radio-local area networks

Publication Year: 1991, Page(s):286 - 292
Cited by:  Papers (2)
| | PDF (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»

Publication Year: 1991, Page(s):21 - 25
Cited by:  Papers (1)  |  Patents (1)
| | PDF (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»

• ### A study of the error mechanism in wideband mobile radio

Publication Year: 1991, Page(s):248 - 254
Cited by:  Papers (1)
| | PDF (304 KB)

Frequency-selective fading caused by multipath time dispersion degrades the performance of digital communication systems by causing intersymbol interference, resulting in an irreducible BER, and imposing an upper limit on the data symbol rate. The authors present the results of a software investigation of the performance of a GSM-based system, over a mobile radio channel, which has been modelled b... View full abstract»

• ### The regulation of mobile communications

Publication Year: 1991, Page(s):131 - 135
| | PDF (352 KB)

Mobile communications are at the forefront of changes in the telecommunications regulatory environment, and are also affected in more ways than any other service. The following topics are discussed: use of the spectrum; regulation for competition; personal communications; regulation in practice; and the regulator's role View full abstract»

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

Publication Year: 1991, Page(s):25 - 30
| | PDF (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»

• ### A mixed voice and data protocol for digital cellular radio

Publication Year: 1991, Page(s):108 - 114
Cited by:  Papers (3)  |  Patents (2)
| | PDF (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»

• ### DCS1800-the standard for PCN

Publication Year: 1991, Page(s):175 - 181
Cited by:  Papers (3)
| | PDF (400 KB)

The new standard known as Digital Cellular System at 1800 MHz (DCS 1800) was developed within ETSI GSM and Phase I was approved in February 1991. Subsequently work has continued on a combined DCS/GSM work programme in order to provide improved features and techniques based on a merged set of recommendations. The authors describe enhancements incorporated into the new standard to support PCN (perso... View full abstract»

• ### Delivering cordless telephony in the access network using fibre-radio'

Publication Year: 1991, Page(s):45 - 48
| | PDF (184 KB)

A method of delivering cordless access is described, in which a radio distribution point (DP) is fed by an analogue optical link. Using sub-carrier multiplexing the radio path between the handset and the cordless fixed part is extended over single-mode optical fibre, in a system known as fibre-radio'. The call processing and other functions such as frequency conversion may therefore be located at... View full abstract»

• ### An analytical model for indoor multipath propagation in the picocellular environment

Publication Year: 1991, Page(s):1 - 8
Cited by:  Papers (5)
| | PDF (416 KB)

Presents a deterministic algorithm for the prediction of channel characteristics for small cell radio systems. This is achieved through the application of ray tracing techniques on a simplified 3-D description of a given environment. The model has been shown to agree well with wideband measurements made at the University of Bristol. The model has been used to generate narrowband data, Doppler scat... View full abstract»

• ### Characterisation of short-range microwave radio transponding channels for road-use debiting schemes

Publication Year: 1991, Page(s):261 - 266
Cited by:  Papers (1)
| | PDF (492 KB)

The authors present the results of the efforts of the PAMELA consortium to characterise microwave radio propagation channels likely to be encountered in any short-range digital data transponding link. They describe the geometry of the multipath problem for both directions of the link. The effects of antenna patterns on the transmission are implemented in the modelling by incorporating measurement ... View full abstract»