By Husni Hammuda
So much radio platforms became so well known that the on hand frequency bands may be able to meet just a fraction of the call for. This booklet provides functional suggestions for optimizing potency of cellular radio cells.
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Extra info for Cellular mobile radio systems : designing systems for capacity optimization
BASIC ANALOGUE MODULATION TECHNIQUES 27 Signal to noise performance of baseband systems The signal quality at the output of an analogue modulation system is usually measured in terms of the average signal power to noise power, defined as: S9=No Efm2o tg Efn2o tg 3:4 where mo t is the output signal message, no t is the noise at the output of the system and Efxg denotes the average of x. The message signal will be taken as a voice signal, band-limited to fm and hence satisfies the condition: Mo f 0 for f !
Nevertheless, this will lead to a waste of transmitted power and to an inferior signal to noise performance. Transmitted signal power and bandwidth of SSB signals The bandwidth BT required to transmit a message signal of bandwidth fm using SSB modulation is: BT f m : 3:44 The average transmitted power PT of a SSB modulated signal can be easily verified to be half that of a SSB-SC signal, provided that the average message signal power is identical in both cases. That is, for a SSB: PT 1 Pm : 4 3:45 Signal to noise performance of SSB systems For coherent demodulation of SSB signals, the average signal to noise performance can be derived in the same way as for DSB-SC signals.
2]. The information to be transmitted is contained in the baseband signal; however, it is not feasible to transmit it in this form and modulation is required for the following reasons (a) To match the signal to the frequency characteristics of the transmission medium, as mentioned before. (b) For the ease of radiation. If the communication channel consists of free space, such as in land mobile radio, then antennas are necessary to radiate and receive the signal. For efficient electromagnetic radiation, antennas need to have physical dimensions of the same order of magnitude as the wavelength of the radiated signal.
Cellular mobile radio systems : designing systems for capacity optimization by Husni Hammuda