March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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Mobile equipment
By today’s standards, the mobile phones used for analogue systems were large and offered
a lower level of performance. Battery life was much shorter. This was a result of the fact that
semiconductor technology was less advanced, and frequency modulation was used. This
requires that the full power be transmitted all the time that a call is in process (one of
the advantages of the TDMA technology used for the second-generation GSM and
NA-TDMA technologies is that the duty cycle during a call is only 12.5 per cent).
Furthermore, both transmit and receive functions are required during a call and this means
that the two frequency synthesizers used as the local oscillators are required – one for the
transmit side of the phone and the other ...
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