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Optical Satellite Communication seminar report


Posted by: electronics seminars
Created at: Tuesday 05th of January 2010 03:39:00 AM
Last Edited Or Replied at :Wednesday 15th of February 2012 03:27:03 AM
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g the same path. Once the GEO terminal receives the LEO communication beam it switches from the beacon to the forward link communication beam. The LEO and GEO terminals then track on the received communication beams, thereby foaming. a communication link between the LEO and GEO space craft.
3.3.3 Tracking
After successful acquisition, the LEO and GEO terminals are operating in tracking mode In this mode the on-board disturbances which introduce pointing fitter into the communication beam are alternated by means f a fine pointing control loop (FPL) to enable acceptable communications to be o..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: audithya
Created at: Friday 23rd of October 2009 12:19:03 AM
Last Edited Or Replied at :Friday 23rd of October 2009 10:01:33 AM
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seminars on above..................[:=> Show Contents <=:]



optical space communication or Free-space optical communicationFSO


Posted by: computer science crazy
Created at: Sunday 13th of September 2009 07:43:26 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:53 AM
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ive scattering. In scattering ” unlike absorption ” there is no loss of energy, only a directional redistribution of energy that may have significant reduction in beam intensity for longer distances.

Physical obstructions: Flying birds or construction cranes can temporarily block a single-beam FSO system, but this tends to cause only short interruptions, and transmissions are easily and automatically resumed. LightPointe's optical wireless products use multi-beam systems (spatial diversity) to address temporary obstructions, as well as other atmospheric conditions, to provide f..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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se used with fibers.

The advantages of such a system are the following:
_ No need for digging up the roads
_ No radio frequency licenses are required
_ Bandwidth is equal or superior to fibre systems and much better than RF
_ Doesn't cause interference with existing electromagnetic equipment because interference on narrow band point-to-point connections is rather unlikely.

But there are as well some limitations:
_ Absorption (caused primarily by the water vapor and carbon dioxide)
_ Scattering (depends of the used wavelength and the number and size of scattering elements in the a..................[:=> Show Contents <=:]



Optical Free Space Communication


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 11:34:59 PM
Last Edited Or Replied at :Wednesday 15th of February 2012 01:17:57 AM
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ements in semiconductors optical free space communication has become n attractive alternative to existing signal conducts as fibre or wireless (RF). It offers high data rates and is much less expensive than underground fibre. But there are a few restrictions, which may mean it remains an alternative. Many engineers are familiar with one of two successful existing technologies for data communication: (1) Guided wave (e.g. fibre optics) and (2) wireless free space communication (e.g. RF). Fibre optics offers extremely high bandwidths for high data rate, while RF communications offers the advanta..................[:=> Show Contents <=:]



FIBRE OPTIC COMMUNICATION


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 01:27:41 PM
Last Edited Or Replied at :Saturday 16th of July 2011 05:51:40 AM
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liable light wave technology. The telecommunications industry receives the most benefits from fiber optics. It allows for the transmission of audio, video, and data information in high quality.

Fiber optics uses light pulses directed down a tiny glass fiber in order to relay information. Two different types of fibers are in use today, single mode, and multimode. Each of these types of fibers are made of three different parts, the core, the cladding, and the buffer. While singlemode and multimode fibers are composed of the same components, they do still differ.

Singlemode fibers are signi..................[:=> Show Contents <=:]



Global System for Mobile Communication GSM


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:49:27 AM
Last Edited Or Replied at :Tuesday 02nd of November 2010 07:23:59 AM
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recommendations, not requirements. The GSM specifications define the functions and interface requirements in detail but do not address the hardware. The reason for this is to limit the designers as little as possible but still to make it possible for the operators to buy equipment from different suppliers. The GSM network is divided into three major systems: the switching system (SS), the base station system (BSS), and the operation and support system (OSS).

The operations and maintenance center (OMC) is connected to all equipment in the switching system and to the BSC. The implementation o..................[:=> Show Contents <=:]



Cellular Communications


Posted by: computer science crazy
Created at: Sunday 21st of September 2008 12:38:42 AM
Last Edited Or Replied at :Sunday 21st of September 2008 12:38:42 AM
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rovide up-to-the-minute implementation advice to customers...................[:=> Show Contents <=:]



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