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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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