University of Colorado at Boulder
Wideband Code Division
and Multiplication Access
December 11th , 2006
presented by:
Souhaibe Barkat
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
WCDMA
Uplink
Downlink
Total
1710-1770
2110-2170
2x60 MHz
In Europe and Japan
Uplink
Downlink
Total
UMTS-FDD 1920-1980
2110-2170
2x60 MHz
UMTS-TDD 1900-1920
2110-2025
20+15 MHz
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
Root Raised Cosine for WCDMA, FB=100, RRCF with alfa=0.22, k=9
1.5
1
0.5
0
-0.5
-1
-1.5
-0.05
0
0.05
0.1
0.15
0.2
0.25
0.3
0.35
0.4
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
1.
2.
3.
4.
5.
6.
7.
Alcatel
Ericsson
Lucent
Motorola
Nokia
Nortel
Siemens/NEC
Questions?