Modelling of radiowave propagation in microcells

Jakoby, Ralf; Liebenow, U.

doi:10.1049/cp:19950454

Cited by 6 publications

(3 citation statements)

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“…One advantage of the utilisation of this cell type is that additional capacity can be provided at 'traffic hot-spots' and it is thus possible to target areas with high capacity requirements directly. Various aspects for planning microcellular systems have been studied, including the feasibility of tool based coverage planning [3] and the benefits obtained from antenna [4] and polarisation diversity [5]. Due to propagation conditions prevailing in these environments and because of the output power of the Base Transceiver Station (BTS) used, the coverage area of microcells is refined to relatively small geographical areas.…”

Section: Introductionmentioning

confidence: 99%

A practical approach to "channel borrowing" for microcells in GSM systems

Wille

Multimaki²,

Irons³

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)

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This paper describes a novel method to determine the least interfered channel for microcells in GSM radio networks. The determination of this optimum channel is based on analysis of signal level measurements from the serving and neighbouring cells. These measurements are provided as part of the standard GSM functionality by mobile stations of ordinary subscribers while being in a call. The method has been applied to different cell types in various networks and proved to be very useful in achieving high capacity networks and good call quality.

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Section: Introductionmentioning

confidence: 99%

A practical approach to "channel borrowing" for microcells in GSM systems

Wille

Multimaki²,

Irons³

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)

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“…lossy dielectric) scatterers. Comparisons between outdoor measurements and predictions show [4] that the most commonly employed diffraction coefficients for lossy dielectric wedges [ 13 and for perfectly conducting wedges [2], predict diffraction losses significantly different to those observed in typical urban environments. Therefore, it is important to derive new improved diffraction coefficients for non-deal objects that correctly model diffraction phenomena.…”

Section: Introductionmentioning

confidence: 99%

Corner and rooftop diffraction in radiowave propagation prediction tools: a review

Demetrescu¹,

Constantinou²,

Mehler³

VTC '98. 48th IEEE Vehicular Technology Conference. Pathway to Global Wireless Revolution (Cat. No.98CH36151)

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Accurate radiowave propagation prediction tools are essential for the optimal design of future mobile telecommunication services. In recent years, raysptical methods have been gaining in popularity, especially for urban radiowave propagation prediction. One of the key propagation mechanisms incorporated in any ray-tracing technique is diffraction. In this paper, we present new diffraction coefficients for both solid and hollow dielectric wedges. The theoretical predictions are validated throughout against controlled laboratory measurements. For the solid wedge diffraction problem, we compare our predictions with those obtained using the widely used Luebbers' solution. It is shown that the latter one is in error as much as 10 dl3 in shadow regions.

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“…Evidence in the literature suggests that the prediction accuracy of ray-optical planning tools is poor in deep shadow regions [8,9]. Careh1 theoretical and laboratorybased investigations of dieaction from brick comers have shown that some of the empirically based diffraction coefficients [lo-121 are grossly inaccurate in their predictions in deep shadow regions.…”

Section: Introductionmentioning

confidence: 99%

Detailed radio imaging of buildings at 2.4 GHz

Mughal

Street²,

Constantinou³

Vehicular Technology Conference Fall 2000. IEEE VTS Fall VTC2000. 52nd Vehicular Technology Conference (Cat. No.00CH37152)

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In this stu& we resolve radio images reflected O I and transmitted through, a building of brick construction to a resolution of 4-5 m, and identify contributions to the channel impulse response with detailed geometrical features of the environment that correspond to individual ray-optical interactions. We discuss briefly the valid@ of the common assumptions made by ray-tracing tools in the light of these results. Recommendations for improving the wideband propagation prediction models at the heart of modern planning tools are then made.

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Modelling of radiowave propagation in microcells

Cited by 6 publications

References 0 publications

A practical approach to "channel borrowing" for microcells in GSM systems

A practical approach to "channel borrowing" for microcells in GSM systems

Corner and rooftop diffraction in radiowave propagation prediction tools: a review

Detailed radio imaging of buildings at 2.4 GHz

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