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What are the technical Differences in W-CDMA and CDMA2000.

Mumbai university > Comp > SEM 8 > Mobile Communication

Marks: 10M

Year: Revised 2012

1 Answer
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Point of comparisons Cdma 2000 WCDMA
Core network ANSI 41MAP GSM MAP
Channel bandwidth 1.25MHz[1X],3.75MHz[3X] 5.0MHz
Channelisation code 4-128[1X],4-256MHz[3X] 4-256
Chip rate 1.2288 Mcps[1X],3.6864 Mcps[3X] 4.096Mcps[DOCOMO],3.84Mcps[UMTS]
Synchronisation base station yes No;But synchronised BS is optional
Frame Length 5ms[signalling],20,40,80ms physical layer frames 10 msfor physical layer,10, 20 , 40 & 80ms for transport layer
Multi carrier spreading option Yes but in cdma2000 1X,[Direct spread] No[Direct spread]
Modulation QPSK[Forward link],BPSK[Reverse Link] QPSK[both links]
Modes of operation FDD FDD and TDD
Source identification code,For sector One PN code [32768 chips], 512,unique offset are generated using PN offset 512 unique scrambling codes each identifying a sector [38400 chips
Source identification code for mobile One long Pn code[242,chips]unique offset are generated based on ESN,not assigned by sector Unique scrambling codes assigned by sector
Channel coding Convolutional and turbo code Convolution and turbo code
Power control Both links[800Hz] Both links[1500Hz]
Circuit switched core network IS-41 MSC/HLR/AC GSM MAP,MSC/HLR/AuC
Packet switched core network IETF based,,PDSN/AAA/HA/FA GPRS based,SGSN/GGSN
Voice coder EVRC AMR
Peak data rate 614 kbps 2Mbps
Multimedia services yes Yes
overhead Low[because of sdhared pilot,code channel] High [because of non shared pilot code channel]
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