07-04-2011, 12:16 PM
Presented by:
Rodger E. Ziemer
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3G CDMA - WCDMA and cdma2000
Rules for Efficient Multiple Access
Three laws
Know the channel
Minimize interference to others
Mitigate interference received from others
Requirements of wireless multiple access
Channel measurement
Channel control and modification
Multiple user channel isolation
Why CDMA?
Higher capacity
Improved performance in multipath by diversity
Lower mobile transmit power = longer battery life
Power control
Variable transmission rate with voice activity detection
Allows soft handoff
Sectorization gain
High peak data rates can be accommodated
Combats other-user interference = lower reuse factors
What is Third Generation? [1]
Flexible support of multiple services
Voice
Messaging – email, fax, etc.
Medium-rate multimedia – Internet access, educational
High-rate multimedia – file transfer, video
High-rate interactive multimedia – video telecon-ferencing, telemedicine, etc.
Mobility: quasi-stationary to high-speed platforms
Global roaming: ubiquitous, seamless coverage
Evolution from second generation systems
W-CDMA Versus cdma2000 [2]
WCDMA Uplink Frame Structure [1]
WCDMA Uplink Modulator Structure [1]
Orthogonal Variable Spreading Factor Codes
WCDMA Downlink Frame Structure [1]
WCDMA Downlink Modulator Structure [1]
Transmit Diversity Strategy for Downlink
cdma2000 Uplink Frame Structure
cdma2000 Uplink Modulator
cdma2000 Downlink Frame Structure
cdma2000 1X DL Modulation Processing
cdma2000 1X Downlink Modulation
cdma2000 3X DL Modulation Processing
cdma2000 3X Downlink Modulation
cdma2000 vs WCDMA
Chip rate
Coherent Pilot Channels
Transmit Diversity
Underlying Network
Single Carrier versus Multicarrier Spreading
Cell Site Synchronization
WCDMA: More Information?
21.101 à guide to all other documents
25.XXX series à radio access network (RAN)
25.211 à frame structure etc.
25.212 à channel coding etc.
25.213 à spreading and modulation
25.214 à physical layer procedures (tx diversity, etc.)
25.321 à medium access control (MAC)
25.322 à radio page link control (RLC)
26.XXX series à voice coding
GSM/GPRS/EDGE: More Information?
cdma2000: More Information?
Technical Specification Group C à cdma2000
C.S0002-A-1 à Physical Layer Standard
C.S0003-A-1 à Medium Access Control (MAC)
C.S0004-A-1 à Signaling Link Access Control
C.S00024 à 1XEV-DO (high speed packet)
C.S0005 à Upper Layer Signaling (L3)