STUDY ON 4G COMMUNICATION ARCHITECTURE COMPONENTS FOR SOCIAL NETWORKS

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INTRODUCTION
Mobile systems focus on seamlessly
integrating the existing wireless technologies
including GSM, wireless LAN, and Bluetooth.
4G systems supports comprehensive and
personalized services, providing stable system
performance and quality service [1] . 4G is a
Mobile multimedia, anytime anywhere, Global
mobility support, integrated wireless solution,
and customized personal service network system
[2]. 4G is used broadly to include several types
of broadband wireless access communication
systems along with cellular telephone systems.



TECHNOLOGY USED IN 4G
COMMUNICATION SYSTEM
The infrastructure and the terminals of 4G
will have almost all the standards from 2G to 4G
implemented. The infrastructure for 4G will be
only packet-based (all-IP). But there is
suggestion to have an open Internet platform[2].
The 4G technology en suite with 802.16e
mobile version of WiMax (also known as
WiBro), and HC-SDMA, Adoptive Modulation
and coding (AMC),Adaptive Hybrid ARQ ,
MIMO AND OFDM and Open distributed Ad-
Hoc Wireless Network


ADAPTIVE MODULATION AND
CODING (AMC)
The principle of AMC is to change the
modulation and coding format (transport format)
in accordance with instantaneous variations in
channel conditions, subject to system
restrictions. AMC extends the system’s ability to
adapt to good channel conditions. Channel
conditions should be estimated based on
feedback from the receiver.


SOCIAL NETWORK SYSTEM
A social network site is a web site that Acts
as a destination hub for individuals to establish
relationships with co-workers and by doing so,
enable them to jointly build, or expand, their
professional and social networks.