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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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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Power electronics remains an emerging technology. Two important factors in power electronics system are the switching speed of the devices and the total power loss in the system. If the switching speed can be increased ,improvements may be possible i.e. current ripples in an electrical machine or physical size of passive components may be reduced. Increased switching speed may cause additional losses in a power electronics system and increase the system cooling requirement. A common problem is that high-frequency phenomena like proximity eff ....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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EXPERT SYSTEMS AND SOLUTIONS



Abstract
The phenomenon of violet glow, hissing noise and the production of ozone gas in the overhead transmission line known as corona is used in our project for the production of ozone gas. The gas produce out of the device can be used for the treatments of drinking water disinfections and air purification.
The device has a discharge tube in which high electric field is applied so as to breakdown the oz ....etc

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Power electronics remains an emerging technology. Two important factors in power electronics system are the switching speed of the devices and the total power loss in the system. If the switching speed can be increased ,improvements may be possible i.e. current ripples in an electrical machine or physical size of passive components may be reduced. Increased switching speed may cause additional losses in a power electronics system and increase the system cooling requirement. A common problem is that high-frequency phenomena like proximity eff ....etc

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