Scrambling
The concept of spreading the information in a CDMA system. In
addition to spreading, part of the process in the transmitter is the scrambling operation.
This is needed to separate terminals or base stations from each other. Scrambling is used on top of spreading, so it does not change the signal bandwidth but only makes the signals from different sources separable from each other.
With scrambling, it would not matter if the actual spreading were performed with identical codes for several transmitters. Below shows the relationship of the chip rate in the channel to spreading and scrambling in UTRA.
As the chip rate is already achieved in spreading by the channelisation codes, the symbol rate is not affected by the scrambling.
