March 2006
Beginner
216 pages
6h 56m
English
Content preview from Cellular Communications Explained
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Spreading codes
As a CDMA system is based on direct sequence spread spectrum techniques, the core of the system
revolves around the use of the orthogonal chip or spreading codes. The codes used in cdmaOne
are called Walsh codes, and the system combines these with two pseudo-random noise (PN) codes
for each communication channel. By using a number of different codes, it is possible to create
different channels. These can either be used for control applications or for carrying the data
payload. The different channels can then be separated by the receiver, as the receiver is only able
to correlate those for which it has been provided with the required Walsh codes. All other signals
using other Walsh codes just appear as noise.
The Walsh codes used for ...
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