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

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written 7.8 years ago by

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	Modes of operation	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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