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Table 24-5: Summary of bands and types of terminals used System type Frequency bands Applications gathering, telephony Direct broadcast satellite Ku Direct-to-home video/audio Voice and lowspeed data to mobile terminals Cellular telephony, data, paging 03 06-meter DirecTV, fixed earth station Echostar, USSB Laptop Inmarsat, computer/antenna- AMSC mounted but mobile Cellular phone Iridium, and pagers; fixed GlobalStar phone booth OrbComm Terminal type/size Examples
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Satellite Characteristics
As already mentioned, satellite communications have three general characteristics that lead to interoperability problems with systems that have not been designed to accommodate them: 1 Delay (or latency) 2 Noise 3 Limited bandwidth It is important to understand each of these in general terms and in more detail Since the invention and installation of fiber optics, communications systems have been treated as ideal with very low latency, no noise, and nearly infinite bandwidth (the capacities are rapidly moving to Terabit bandwidth from current fiber systems) These characteristics still have room for doubt and development, but for satellite communications, the characteristics of fiber can make it very difficult to provide cost-effective interoperability with land-based systems The latency problem is foremost among the three Noise can be handled by the application of error control coding Bandwidth efficiency is an important goal for satellite systems today, but will become increasingly important as the number of users increases as well as the data requirements
Latency
We have seen that there is an inherent delay in the delivery of a message over a satellite link, due to the finite speed of light and the altitude of communications satellites As we stated, there is approximately a 250- millisecond propagation delay in a GEO These delays are for one ground station-to-satellite-to-ground station route (or hop ) The round-trip propagation delay for a message and its reply would be a maximum of 500 milliseconds The delay will be proportionately longer if the link includes multiple hops or if intersatellite links are used As satellites become more complex and include onboard processing of signals, additional delay may be added Other orbits are possible including Low Earth Orbit (LEO) and Medium Earth Orbit (MEO) The advantage of GEO is that the satellite remains stationary over one point of the earth, allowing simple pointing of large antennas The lower orbits require the use of constellations of satellites for constant coverage, and they are more likely to use intersatellite links, which result in variable path delay depending on routing through the network
Noise
The strength of a radio signal falls in proportion to the square of the distance traveled For a satellite link, this distance is very large and so the signal becomes very weak This results in a low, signal-to-noise ratio Typical bit error rates for a satellite link might be on the order of 10 -7 Noise becomes less of a problem as error control coding is used Error performance equal to fiber is possible with proper error control coding
Bandwidth
The radio spectrum is a finite resource, and there is only so much bandwidth available Typical carrier frequencies for current point-to-point (fixed) satellite services 6/4 GHz (C band); 14/12 GHz (Ku band); and 30/20 GHz (Ka band) Traditional C and Ku-band transponder bandwidth is typically 36 MHz to accommodate one color television channel (or 1200 voice channels) One satellite may carry two dozen or more transponders New applications, such as personal communications services, may change this picture Bandwidth is limited by nature, but the allocations for commercial communications are limited by international agreements so that the scarce resource can be used fairly Applications that are not bandwidth efficient waste a valuable resource, especially in the case of satellites Scaleable technologies will be more important in the future
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