March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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including poor radio signal conditions, where errors are high and when the network is heavily
loaded. It is particularly useful at cell bounda ries, where signal levels are lower and interference
levels may be higher.
There are eight full-rate modes within AMR, and these operate at: 12.2, 10.2, 7.95, 7.4, 6.7, 5.9,
5.15 and 4.75 kbps. The highest rate of 12.2 kbps is actually the same as the GSM EFR vocoder
and the 7.4 rate is the same as that used in ANSI-136 TDMA. The bit rate for each burst is
22.8 kbps. This includes both the voice data and the error correction information. By decreasing
the voice data, the error correction can be increased to allow for increased errors and the system can
therefore operate under poorer conditions by increasing ...
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