By D.I. Dalgleish

ISBN-10: 0863411320

ISBN-13: 9780863411328

The purpose of this e-book is to provide a transparent and concise exposition of the foundations and perform of satellite tv for pc communications by means of describing the advance of communications-satellite prone. it will likely be priceless either to engineers who've labored in different fields of telecommunication and to scholars.

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Modern satellites have much greater power and bandwidth than the early generations so that it is no longer necesary for even those earth stations with the largest traffic loads to use antennas with diameters of 30 m and the biggest earth-station antennas made today have diameters of about 18 m. At the other end of the scale are the antennas used with microterminals or very-small-aperture terminals (VSATs) which have diameters of the order of 1 m; VSATs make inefficient use of satellite power and bandwidth but are very cheap and this makes it economic to use them in systems where a large number of terminals (say 100 or more) are needed.

5); typically, the use of companding halves both the satellite power and the bandwidth required to transmit a given number of channels. 5 SCPC FDM multiplexes comprise groups of twelve channels. Thus earth stations operating in FDM-FM-FDMA systems must provide equipment for the transmission and reception of packages of 12 channels. This can be wasteful, particularly for small stations which operate to several routes (each carrying only two or three circuits). The use of multi-destination carriers also means that a station may have to provide a large amount of demultiplexing equipment to separate out the channels intended for it from those intended for other stations, and this demultiplexing equipment may have to be reconfigured (and possibly supplemented) when it becomes necessary to make changes in the pattern of traffic flow through the satellite.

Thus earth stations operating in FDM-FM-FDMA systems must provide equipment for the transmission and reception of packages of 12 channels. This can be wasteful, particularly for small stations which operate to several routes (each carrying only two or three circuits). The use of multi-destination carriers also means that a station may have to provide a large amount of demultiplexing equipment to separate out the channels intended for it from those intended for other stations, and this demultiplexing equipment may have to be reconfigured (and possibly supplemented) when it becomes necessary to make changes in the pattern of traffic flow through the satellite.

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An Introduction to Satellite Communications by D.I. Dalgleish


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