- In CDMA systems that narrow band message signal is multiplied by a very large bandwidth signal called the spreading signal.
- the spreading signal is a pesudo noise code sequence that has a chip rate which is many times greater than the data rate of the message.
- while this system is very bandwidth efficient for a single user the advantage of spreading spectrum is that many users can simultaneously use the same bandwidth without significantly interfering with one another.
- one technique which CDMA use to combine the digital information stream with the PN
code is using EX-OR gates in CDMA spreading is normally done in three steps.
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