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Specifications of WCDMA

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Channel Bandwidth 

5 MHz

Duplex Mode 

FDD and TDD

Downlink RF Channel Structure 

Direct Spread (DS)

Chip Rate 

3.84 Mcps

Frame Length 

10 ms

Spreading Modulation 

Balanced QPSK (downlink)

Dual-channel QPSK (uplink)

Complex spreading circuit

Coherent detection 

• User dedicated time multiplexed pilot (downlink and uplink)

• common pilot in downlink

Channel Multiplexing in Downlink 

Data and control channel are multiplexed

Channel Multiplexing in Uplink  

• Control and pilot channel time multiplexed

• I&Q multiplexing for data and control channel

Multirate 

Variable spreading and multicode

Spreading (uplink) 

OVSF sequences. Gold sequence 241 for user separation (different time shifts in I and Q channel, truncated cycle 10 ms)

Spreading (downlink) 

OVSF sequences for channel separation. Gold sequences 218-1 for cell and user separation (truncated cycle 10 ms)

Spreading Factors 

4-256 (uplink), 4-512 (downlink)

Power Control 

Open and fast closed loop (1.6 kHz)

Handover

 Soft handover, Inter-frequency handover, etc.

Data Modulation

QPSK (downlink), BPSK (uplink)

Channel Coding 

Convolutional and turbo codes

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