March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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full rate when a person is talking very fast. It uses the 1/8 rate when the person is silent or nearly
silent. In most areas the 13-K vocoder is the standard, but the originator of the call controls which
vocoder is used.
The vocoder algorithm that is used is Coded Excited Linear Prediction (CELP). The actual specific
algorithm used for cdmaOne is QCELP, a Qualcomm variant of CELP that assists in increasing
the available system capacity.
Two rate-fa milies are currently supported, the first based on 9600 bps and the second on
14 400 bps.
Advantages of CDMA
One of the main advanta ges claimed for CDMA is a vast improvement in the efficiency of the use of
the spectrum. However, this parameter is very difficult to calculate in real terms, an d there
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