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centre carrier frequency in UMTS

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chillin4ever

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The bandwidth for UMTS is 5 MHz but i was just wondering if the carrier is always spaced @ centre of 5MHz block?

& what is the importance of channel raster in UMTS (& GSM)
 

In GSM, bandwidth is 200khz and it uses TDMA technology (frequency and timeslot) and In UMTS, bandwidth is 5Mz and it used WCDMA (Scrambling code and Pilot code)
 

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