In the scrambling process the code sequence is multiplied with a
pseudorandom scrambling code.
• The scrambling code can be a long code (a Gold code with 10 ms
period) or a short code (S(2) code).
• In the downlink scrambling codes are used to reduce the inter-basestation
interference. Typically, each Node B has only one scrambling
code for UEs to separate base stations. Since a code tree under one
scrambling code is used by all users in its cell, proper code
management is needed.
• In the uplink scrambling codes are used to separate the terminals. |
