By Husni Hammuda
So much 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 supplies sensible options for optimizing potency of cellular radio cells.
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Extra resources for Cellular Mobile Radio Systems: Designing Systems for Capacity Optimization
3]. 2(b), it can be seen that the bandwidth BT required to transmit a message signal of bandwidth fm using DSB-SC is: BT 2 fm : 3:15 It is obvious that this is a waste of spectrum since both sidebands of the signal are transmitted, yet they carry identical information. The average transmitted power PT of the DSB modulated signal x t is given by: PT Efx2 tg 2 Assuming 1 load 2 PT Efm t cos wc tg ; PT 1 Pm 2 where Pm is the average message signal power. 4, with ideal channel and ideal subsystems.
In SSB modulation, only one of the two sidebands which result in multiplying the message signal m t with the carrier is transmitted. Conceptually, the simplest way of generating a SSB signal is to first generate a DSB signal and then suppress one of the sidebands using a bandpass filter. Coherent demodulation of a SSB signal is possible using a synchronous carrier, in the same way as for a DSB signal. Modulation and demodulation of SSB signals as described above seem to be simple and straightforward, however, practical implementation of the SSB technique is not trivial for two reasons.
3 Amplitude Modulation (AM) This is another type of linear modulation which can be generated by adding a large carrier component to a DSB signal. The amplitude modulated signal has the following form: x t 1 m t cos wc t 3:31 x t cos wc t m t cos wc t 3:32 ; AM carrier DSB-SC: 3:33 It can be seen that the envelope of the AM signal resembles the message signal provided that the following conditions are met: fc ) fm and 1 m t > 0: An important parameter of an amplitude modulated signal is the modulation index mx defined as: mx peak DSB-SC amplitude : peak carrier amplitude 3:34 Hence, a more general form of an amplitude modulated signal is: x t 1 mx m t cos wc t: 3:35 The message signal can be completely recovered from the AM signal by simply using an envelope detector provided that mx does not exceed one.
Cellular Mobile Radio Systems: Designing Systems for Capacity Optimization by Husni Hammuda