what is the main difference between 1G,2G and 3G?.and also between WCDMA and CDMA2000?

Answer 1

The main difference between two succeeding mobile telephone systems, 1G and 2G, is that the radio signals that 1G networks use are analog, while 2G networks are digital. Although both systems use digital signaling to connect the radio towers (which listen to the handsets) to the rest of the telephone system, the call itself is encoded to digital signals in 2G whereas 1G is only modulated to higher frequency, typically 150MHz and up.

WCDMA is totally different from CDMA2000. WCDMA is based on GSM technology and thus requires a USIM card, which is similar to the GSM SIM card. Basiclaly , WCDMA is the third generation of GSM technology, where as CDMA2000 is the third generation of CDMA.

Technically generations are defined:

1G networks (NMT, C-Nets, AMPS, TACS) are considered to be the first analog cellular systems, which started early 1980s. There were radio telephone systems even before that.

2G networks (GSM, cdmaOne, DAMPS) are the first digital cellular systems launched early 1990s.

2.5G networks (GPRS, cdma2000 1x) are the enhanced versions of 2G networks with data rates up to about 144kbit/s.

3G networks (UMTS FDD and TDD, cdma2000 1x EVDO, cdma2000 3x, TD-SCDMA, Arib WCDMA, EDGE, IMT-2000 DECT) are the latest cellular networks that have data rates 384kbit/s and more.

4G is mainly a marketing buzzword at the moment. Some basic 4G research is being done, but no frequencies have been allocated. The Forth Generation could be ready for implementation around 2012.

3G WCDMA systems have 5MHz bandwidth (one direction). 5MHz is neither wide nor narrow; it is just the bandwidth. New 3G WCDMA systems have wider bandwidth than existing 2G cdma systems (cdmaOne 1.25MHz), that's why the "Wide". There are commercial cdma systems with 20MHz bandwidth.

Answer 2

Concerning WCDMA and CDMA2000, they
are both standards for advanced digital wireless
communications, but by differents standards
bodies. Both use "code division multiple access",
an advanced technology that uses "codes" to
separate communications in the same frequency
band. WCDMA uses 5 megahertz channels,
while CDMA2000 uses 1x1.25 MHz,
2x1.25MHz or 3x1.25Mz.

Qualcomm has a PDF file comparing
CDMA2000 and WCDMA:

http://www.qualcomm.com/about/gcrc/
pdf/Commonalities_CDMA2000_WCDMA.pdf

(all on one line)

Answer 3

WCDMA incorporates all the good points of code division multiple access into GSM, it is a third generation technology.
CDMA2000 is a new iteration of the CDMA standard.
1G - Analog signal based systems
2G - conversion to digital
3G - Beyond voice and text

Answer 4

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Answer 5

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Answer 6

This is puzzling to me too

Answer 7

Thanks to each and every one of you guys for the answers!