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DPDCH in the uplink for UMTS

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chillin4ever

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in UMTS, the higher the data bit rate, the smaller the SF and higher the trasmit power.

in the case of uplink, we can have a maximum of 6 DPDCH channels and one DPCCH.

can these 6 DPDCH have different SF or they need to have same SF?

Second regarding the spreading code numbers , eg. spreading code number 2 = SF 8 but for SF 4 we have speading code number as 1 , {1,2} , {1,2,3} why is it so?
 

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