March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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The final scheme employs one of the aspects associated with the use of direct sequence spread
spectrum. In Chapter 3, it was seen that when extracting the required data from a DSSS signal
it was necessary to have the correct spreading or chip code, and all other data from sources using
different orthogonal chip codes would be rejected. It is therefore possible to allocate different codes
to different users, and to use this as the means by which different users are given access
to the system.
The scheme has been likened to being in a room filled with people all speaking different languages.
Even though the noise level is very high, it is still possible to understand someone speaking in your
own language. With CDMA, different spreading or chip codes ...
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