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Abstract
LEO is Low Earth Orbit satellite.It circulates on a lower orbit in a shorter period . Additionally LEO systems try to ensure a high elevation for every spot of the earth to provide a highquality communication page link . The networks will play an important role in the evolving information infrastructure . It provides communication with shorter endto- end delays and e_ciency frequency usages . Some problems need to be solved before LEO satellite system can be successfully deployed . One of these problems is handover management . Even ....etc

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STUDY ON 4G COMMUNICATION ARCHITECTURE COMPONENTS FOR SOCIAL NETWORKS


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 . 4G is a
Mobile multimedia, anytime anywhere, Global
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Satellite Communication Systems


TRANSMITTER CHAIN
Information to be transmitted is delivered
to the earth station via coaxial cable, fiber,
terrestrial microwave, or satellite. The
devices in the transmitter chain typically
consist of the multiplexer, the modulator,
the upconvertor, a high power amplifier,
and the antenna. The multiplexer
combines the individual channels onto a
single data stream. The information can
be encrypted and encoded with a f ....etc

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communications satellite

communications is an artificial satellite stationed in space for the purpose of telecommunications. Modern communications satellites use a variety of orbits including geostationary orbits, Molniya orbits, otherelliptical orbits and low (polar and non-polar) Earth orbits.For fixed (point-to-point) services, communications satellites provide a microwave radio relay technology complementary to that of submarine communication cables. They are also used for mobile applications such as communications to ships, ve ....etc

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RECENT TRENDS IN IP/NGEO SATELLITE COMMUNICATION SYSTEMS: TRANSPORT, ROUTING, AND MOBILITY MANAGEMENT CONCERNS
ABSTRACT
Non-geostationary (NGEO) satellite communication systems are seen as an attractive solution to realize the vision of anywhere, anytime pervasive access to the Internet. Their design and development have thus gained tremendous interest in the last few years. Commencing with a brief overview of general NGEO satellite configurations, this article next addresses the key technical difficulties in the development ....etc

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its advantages and disadvantages.
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