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presented by:
Souhaibe Barkat
Wideband Code Division and Multiplication AccessWideband Code Division
and Multiplication Access
December 11th , 2006
University of Colorado at Boulder
1. WCDMA Use
• 3rd generation cellular network
• Sprint, AT&T, Nokia, and Ericsson
• More bandwidth means more capabilities
2. Frequency Band Allocation
Uplink Downlink Total
WCDMA 1710-1770 2110-2170 2x60 MHz
Uplink Downlink Total
UMTS-FDD 1920-1980 2110-2170 2x60 MHz
UMTS-TDD 1900-1920 2110-2025 20+15 MHz
In The United StatesIn The United States
In Europe and JapanIn Europe and Japan
3. Standard Body
• Concept formed by FRAMES research project with Panasonic, Fujitsu, and NEC + many other
• (FRAMES) Future Radio Wideband Multiple Access System
• Uplink physical layer adopted by FRAMES
• Downlink was modified by several companies
4. Information Bits and Modulation
Baseband TransmitterBaseband Transmitter
4. Information Bits and Modulation
Baseband ReceiverBaseband Receiver
5. Error Control Coding
• Convolutional encoding for MPEG4 >> BER of 10^-3
• Turbo encoding for data application >> BER of 10^-6
6. Constellations Used
• QPSK for downlink transmission
• 16QAM is used for HS-DSCH to provide higher speed data
HS-DSCH: High Speed Dedicated Physical Control Channel
WCDMA Receiver
RAKE ReceiverRAKE Receiver
7. IQ Modulator
I-Q Uplink ModulatorI-Q Uplink Modulator
7. IQ Modulator
I-Q Downlink ModulatorI-Q Downlink Modulator
8. Pulse Shape Used
• Root Raised Cosine with roll-off = 0.22
-0.05 0 0.05 0.1 0.15 0.2 0.25 0.3 0.35 0.4-1.5
-1
-0.5
0
0.5
1
1.5Root Raised Cosine for WCDMA, FB=100, RRCF with alfa=0.22, k=9
9. Broadcast Technology Used
• WCDMA does both FDD and TDD
• Uplink:Uplink: Multiple users send signals to the base station
• Downlink:Downlink: Base station sends different signals to different users
10. Multi-Antenna Technology
TransmitterTransmitter ReceiverReceiver
11. Major Players
1. Alcatel
2. Ericsson
3. Lucent
4. Motorola
5. Nokia
6. Nortel
7. Siemens/NEC
Questions?Questions?
