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spreading codes make all data streams have the same chip rate, (3.84Mcps) and scrambling codes distinguishes between users.

usage differences

spreading - return link = separation of physical data and controls channels.

forward ink = separation of downlink connections to different users in same cell.

scrambling - return link = separation of terminals

forward link = separation of sectors

code family

spreading = OVSF

scrambling = Gold code and extended (S2)

spreading

spreading = yes, increase transmission bandwidth

scrambling = No, does not affect transmission bandwidth.

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Q: What are the difference between scrambling and spreading?
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