Wednesday, November 4, 2009

About Spreading codes

This is a technique in which user original signal transformed to another form which occupies more bandwidth

Transformed bits are called chips

each user has its own spreading code, which is used to spread and de-spread

*Spreading codes are unique to the cell (for Downlink)

Two types of spreading codes: Orthogonal and Psuedo-Noise codes

Spreading Factor is 4 to 256 in Uplink and 4 to 512 in downlink

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