160 likes | 264 Views
presented by: Souhaibe Barkat. University of Colorado at Boulder. Wideband Code Division and Multiplication Access. December 11 th , 2006. 1. WCDMA Use. 3 rd generation cellular network Sprint, AT&T, Nokia, and Ericsson More bandwidth means more capabilities. 2. Frequency Band Allocation.
E N D
presented by:Souhaibe Barkat University of Colorado at Boulder Wideband Code Division and Multiplication Access December 11th , 2006
1. WCDMA Use • 3rd generation cellular network • Sprint, AT&T, Nokia, and Ericsson • More bandwidth means more capabilities
2. Frequency Band Allocation In The United States In 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 Transmitter
4. Information Bits and Modulation Baseband 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 Receiver
7. IQ Modulator I-Q Uplink Modulator
7. IQ Modulator I-Q Downlink Modulator
8. Pulse Shape Used • Root Raised Cosine with roll-off = 0.22
9. Broadcast Technology Used • WCDMA does both FDD and TDD • Uplink: Multiple users send signals to the base station • Downlink: Base station sends different signals to different users
10. Multi-Antenna Technology Transmitter Receiver
11. Major Players • Alcatel • Ericsson • Lucent • Motorola • Nokia • Nortel • Siemens/NEC