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Advances in WCDMA Technology: Enhancements in Cellular Networks

This presentation explores the advancements in Wideband Code Division Multiple Access (WCDMA) technology and its crucial role in 3rd generation cellular networks, utilized by major players like Sprint, AT&T, Nokia, and Ericsson. It covers frequency band allocation, the establishment of standards by the FRAMES project, and key elements like error control coding and modulation techniques essential for high-speed data transmission. Insights into the system's architecture, including uplink and downlink communications and multi-antenna technologies, showcase the evolution of mobile connectivity.

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Advances in WCDMA Technology: Enhancements in Cellular Networks

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  1. presented by:Souhaibe Barkat University of Colorado at Boulder Wideband Code Division and Multiplication Access December 11th , 2006

  2. 1. WCDMA Use • 3rd generation cellular network • Sprint, AT&T, Nokia, and Ericsson • More bandwidth means more capabilities

  3. 2. Frequency Band Allocation In The United States In Europe and Japan

  4. 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

  5. 4. Information Bits and Modulation Baseband Transmitter

  6. 4. Information Bits and Modulation Baseband Receiver

  7. 5. Error Control Coding • Convolutional encoding for MPEG4 >> BER of 10^-3 • Turbo encoding for data application >> BER of 10^-6

  8. 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

  9. WCDMA Receiver RAKE Receiver

  10. 7. IQ Modulator I-Q Uplink Modulator

  11. 7. IQ Modulator I-Q Downlink Modulator

  12. 8. Pulse Shape Used • Root Raised Cosine with roll-off = 0.22

  13. 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

  14. 10. Multi-Antenna Technology Transmitter Receiver

  15. 11. Major Players • Alcatel • Ericsson • Lucent • Motorola • Nokia • Nortel • Siemens/NEC

  16. Questions?

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