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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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board of the complete terminal.
The link from LEO to ground via the GEO terminal is known as the return interorbit link (RIOL). The SOUT RIOL data rate is specified as any data rate upto 2 Mbps with bit error ratio (BER) of better than 106. The forward interorbit link (FIOL) from ground to LEO was a nominal data rate of (34 K although some missions may not require data transmissions in this directions. Hence the link is highly asymmetric with respect to data rate.
The LEO technical is mounted on the anti earth face of the LEO satellite and must have a clear line of sight to the GEO termina..................[:=> 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 ..................[:=> 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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ased on connectivity between FSO-based optical wireless units, each consisting of an optical transceiver with a transmitter and a receiver to provide full-duplex (bi-directional) capability. Each optical wireless unit uses an optical source, plus a lens or telescope that transmits light through the atmosphere to another lens receiving the information. At this point, the receiving lens or telescope connects to a high-sensitivity receiver via
optical fiber.

This FSO technology approach has a number of advantages:
Requires no RF spectrum licensing.
Is easily upgradeable, and its open int..................[:=> 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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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 air e.g. fog)
_ Shimmer (due to a combination of factors, including atmospheric turbulence, air density, light refraction, cloud cover, and wind which cause a similar disturbance when a laser beam is transmitted through the atmosphere)
_ Moving building (although we are not aware of the movement, buildings often sway from side to sid..................[:=> 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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ns:
_ 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 air e.g. fog)
_ Shimmer (due to a combination of factors, including atmospheric turbulence, air density, light refraction, cloud cover, and wind which cause a similar disturbance when a laser beam is transmitted through the atmosphere)
_ Moving building (although we are not aware of the movement, buildings often sway from side to side even settle into the ground causing offset to the laser beam and making the receiver l..................[:=> 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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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 significantly smaller than multimode fibers. The core of the fiber is the most crucial part of any fiber. In the core is where the light signals themselves travel through. Because of how easily light r

Fiber optics use light rather than electricity to transmit data. In a fiber optic system, electricity is converted..................[:=> 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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tion 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 of OMC is called the operation and support system (OSS). The OSS is the functional entity from which the network operator monitors and controls the system. The purpose of OSS is to offer the customer cost-effective support for centralized, regional, and local operational and maintenance activities that are required for a GSM network. An important function of OSS is to provide a network overview and support the maintenance activit..................[:=> 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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obile telecommunications technology for both terminals and base stations. We add value to our clients' projects by reducing time-to-market and lowering production costs, and provide lasting benefits through building long-term relationships and working in partnership with our customers.
We have played an active role in cellular communications technology since the 1980's, working initially in GSM and more recently in the definition and development of 3G (UMTS). Roke Manor Research has over 200 engineers with experience in designing hardware and software for 3G terminals and base stations and is..................[:=> Show Contents <=:]



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