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GPRS : General Packet Radio System - page 16 / 20

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Networks: L17

16

WCDMA

all users use the same frequency band and transmit at the same time

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orthogonal Walsh codes for spreading

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Gold codes used for synchronisation and scrambling

should provide :

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higher bit rates – up to 2Mbs

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higher spectrum efficiency

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better QoS

developments in DSP and fabrication costs make CDMA feasible for handsets

chip rate of 3.84Mcps

spreading factors variable from 4 to 512

competing CDMA2000 in USA

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same frequency bands not available in USA

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uses 1.25MHz bands and chip rate of 1.22Mcps

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developed by QualComm – the main CDMA patent-holders

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