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Compare cdma2000 and WCDMA

written 8.3 years ago by teamques10 ★ 68k

•   modified 7.9 years ago

Mumbai University > Electronics and Telecommunication > Sem8 > Wireless Networks

Marks: 10M

Year: May2012, Dec2012, May2013, May2014, Dec2014,

wireless networks

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written 8.3 years ago by teamques10 ★ 68k

Cdma2000 is a 3G technology evolved from IS-95 CDMA technique. WCDMA is a 3G technology evolved from GSM technology.

	Cdma2000	WCDMA
Core network	ANSI-41 MAP	GSM MAP
Channel bandwidth	1.25 MHz (1X), 3.75 MHz (3X)	5.0 MHz
Channelization codes	4-128 (1X), 4-256 (3X)	4-256
Chip rate	1.2288 Mcps (1X), 3.6864 Mcps (3X)	4.096 Mcps (DOCOMO),3.84 Mcps (UMTS)
Synchronized base station	Yes	No; but synchronized BS is Optional
Frame length	5 ms (signaling), 20, 40, 80 ms physical layer frames	10 ms for physical layer, 10,20, 40, and 80 ms 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 (32,768 chips),512 unique offsets are generated,using PN offsets	512 unique scrambling codes,each identifying a sector,(38,400 chips)
Source identification code for Mobile	One long PN code ($2^{42}$) chips,unique offsets are generated,based on ESN, not assigned,by sector	Unique scrambling codes,assigned by sector
Channel coding	Convolutional and turbo code	Convolutional and turbo code
Power control	Both links (800 Hz)	Both links (1500 Hz)
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	2 Mbps
Multimedia services	Yes	Yes
Overhead	Low (because of shared pilot,code Channel)	High (because of non-shared,pilot code Channel)

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