12-04-2012, 02:54 PM
EVOLUTION FROM 3G TO 4G AND BEYOND 5H
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INTRODUCTION
Almost all of the systems of this generation were
Analog systems where voice was considered to be
the main traffic.
1G wireless networks used analog radio signals.
Through 1G, a voice call gets modulated to a higher
frequency of about 150MHz and up as it is
transmitted between radio towers.
This is done using a technique called Frequency-
Division Multiple Access (FDMA).
Second generation::
2G refers to second generation wireless
telecommunication technology. While its predecessor,
1G, made use of analog radio signals, 2G uses digital
radio signals.
Based on what type of multiplexing (the process of
combining multiple digital data streams into one signal)
is employed, 2G technologies may be categorized by
whether they are based on time division multiple access
(TDMA) or code division multiple access (CDMA).
Third generations::
3G is the third generation of mobile phone standards
and technology superseding 2G, and preceding 4G.
To meet the growing demands in network capacity,
rates required for high speed data transfer and multimedia
applications, 3G standards started evolving.
It is based on the International Telecommunication
Union (ITU) family of standards under the International
Mobile Telecommunications programmer, IMT-2000
ADVANTAGES OF 3G TECHNOLOGY
• You are able to have faster connection, audio entertainment with greater quality and faster Internet access.
• You also receive the advantages of video calling because of the greater speed, enjoying phone calls to family as well as friends all over the world with the video calling feature
Disadvantages of 3G technology
• Expensive input fees for the 3G service licenses.
• Numerous differences in the licensing terms
• Large amount of debt currently sustained by many
telecommunication companies, which makes it a challenge
to build the necessary infrastructure for 3G
• Lack of member state support for financially troubled
operators
CONCLUSION
Wireless systems becoming an important infrastructure
in our society. A virtual global system is a good solution that can efficiently connect many dedicated wireless systems including 2G to 4G cellular systems, wireless
LAN, broadcasting systems, etc.