March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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twelve-cell arrangement to provide adequate channel re-use, while still maintaining sufficient
levels of separation to ensure that interference levels are reduced to satisfactory figures. In
some urban areas where system usage is very high the cell coverage areas are reduced, and
the cells may be arranged in a fo ur-cell repeat pattern with six sectors to a cell. Each of the
sectors is then allocated its own set of voice channels, although a single signalling channel is
retained for the whole base station.
The voice channels and signalling channel outputs are combined using a high Q cavity resonator.
As the system operates in full duplex and the transmission mode is FM for the voice channels and
FSK for the paging or control channel, this is on
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