By Husni Hammuda

ISBN-10: 0471956414

ISBN-13: 9780471956419

Such a lot radio structures became so renowned that the on hand frequency bands may be able to meet just a fraction of the call for. This booklet offers functional options for optimizing potency of cellular radio cells.

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Extra info for Cellular Mobile Radio Systems: Designing Systems for Capacity Optimization

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Consequently, the more clusters a cellular system can accommodate in a given service area, the more spectrally efficient it is considered to be. (d) The modulation efficiency  M can be maximized by minimising Bc , Nc or A. The channel spacing Bc is dependant on the modulation technique employed by the cellular system. The theoretical minimum of Nc is one and in this case one cell per cluster will give rise to maximum efficiency, as far as Nc is concerned. Furthermore, minimizing the cell area will depend upon several factors such as the transmitted power, hand-off rate and the availability and tolerance of cell sites.

46) indicates that …S=N†o for SSB systems is identical to that for baseband and DSB-SC systems, in the presence of white noise. 5 Angle (Non-linear) Modulation In contrast to the linear modulation techniques discussed in the preceding sections, angle modulation is a non-linear process where the spectral components of the modulated message signal are not related in any simple fashion to the baseband message signal. 1), and assuming a constant amplitude such that v…t† ˆ Vc X xc …t† ˆ Vc cos ‰wc t ‡ …t†Š: …3:47† Angle modulation is achieved by relating …t† or its derivative to the message signal m…t†, while keeping the amplitude of the carrier Vc constant (for convenience, let Vc ˆ 1).

42 SPECTRAL EFFICIENCY OF ANALOGUE MODULATION TECHNIQUES From the above equations, we note the following: (a) For point-to-point and non-cellular radio systems, the spectral efficiency can be simply presented in terms of the number of channels available to the system and is given by Bt =Bc (channels). In such systems the spectral efficiency is a function of the channel spacing Bc only. (b) In cellular systems, the modulation efficiency measured in Channels/MHz/km2 is inversely proportional to the channel spacing Bc .

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Cellular Mobile Radio Systems: Designing Systems for Capacity Optimization by Husni Hammuda


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