Concepts 3GPP_082307Concepts of W-CDMA(UMTS-FDD)
Andy Yeh
Agenda
CDMA Concepts UMTS Network Architecture W-CDMA Protocol Structure W-CDMA Basic Physical Structure(Physical Channel) Down Link channel Transmit Diversity Up Link channel UMTS-FDD physical layer procedures How will UMTS evolve?
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Multiple Access Approaches
Frequency Division Multiple Access Time Division Multiple Access
1 2
N 3
Spread Spectrum Multiple Access
Code Division Multiple Access
Multiple Transmitters User 2 User 1 User 3 and Multiple Data Channels
Frequency
Frequency
ti m e
Frequency
Each User has a unique frequency (1 voice channel per user) All users transmit at the same time, but on different frequencies AMPS, NMT, TACS
Each User has a unique time slot Each Data Channel has a unique position within the tim……
