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Introduction to 2G and 3G Data Communication Standards

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First and Second Generations (1G and
2G)

First generation wireless devices only
voice signals
Second generation (2G) devices
communicate voice as well as data
signals have data rates of up to 14.4
kbps
The 2.5G and 2.5G+ are enhancements
of the second generation and sport data
rates up to 100 kbps

Third generation (3G) mobile devices
communication

Higher data rates than 2G and support
voice, data, and multimedia streams
Facilitates data rates of 2 Mbps
Higher for short distances
384 kbps for long distance
transmissions.

GSM Standard

A global system for mobile (GSM) was
developed by the Groupe Spéciale
Mobile (GSM)
Founded in Europe in 1982
Support cellular networks

GSM 900

GMSK modulation
FDMA for 124 up channels and 124
down channels
890-915 MHz for uplink and 935-960
MHz
Channel of bandwidth 200 kHz
8 radio-carrier analog-signals TDMA for
user access in each deployed channel

EDGE (enhanced data rates for GSM
evolution)

An enhancement GSM Phase 2.5G+]
8PSK communication to achieve higher
rates of up to 48 kbps per 200 kHz
channel
High compares to up to 14.4 kbps in
GSM.
Using coding techniques the rate can be
enhanced to 384 kbps for the same 200
kHz channel

CDMA

Evolution of CDMA from 2.5G in 1991 as
cdmaOne (IS-95)
CDMA supports high data rates
3G.
Voice as well as data and multimedia
streams.
CDMA 2000, IMT-2000, WCDMA and
UMTS
Support cellular networks

Summary

Mobile voice, data and multimedia
communication standards
GSM 900/1800/1900
2.5G+
GPRS
CdmaOne
WCDMA
CDAM 2000