March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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departure from previous practice, adjacent cells are able to use the same frequency, the different
codes used by the adjacent cells enabling them to work alongside each other.
The characteristics of the transmission betwee n the forward and reverse links are slightly different.
Much of this arises from the fact that the two links are on different frequencies, and the path
lengths are different in terms of the number of wavelengths travelled. In the forward link, a form of
modulation known as Quadra ture Phase Shift Keying (QPSK) is used. Thi s allows 2 bits per symbol
to be transmitted, and is therefore an efficient method of transmitting the data. In the reverse
channel, a form of modulation known as Offset Quadrature Phase Shift Keying (OQPSK) ...
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