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Satellite-based cellular systems

In addition to the terrestrial systems, in recent years satellite-based telephone systems have been under construction. With such a system it is possible to make a connection with a cellular phone all around the world, especially in those regions currently not covered by a terrestrial system. In contrast with other satellite communication systems, satellite-based phone systems operate in the Low Earth Orbit (780 km high), and are therefore called LEO systems. The satellites work differently from those at a much higher orbit (36,000 km) in two major ways. First, the small distance between earth and satellite makes it possible to connect to the system with a handheld device. Second, signals can be moved overhead in between satellites without the use of base stations on the earth. In the near future, operators will supply services in which terrestrial and satellite communication are integrated.

Like in the terrestrial systems, the satellites operate on certain frequencies, that have to be selected in such a way that interference is avoided. Not only frequencies are needed to communicate with handheld devices, but also to establish communication between satellites and ground stations, and between satellites mutually.

cellular telecommunication networks

One of the most recent applications of wireless communication is the establishment of fixed cellular telecommunication networks. In contrast to mobile cellular networks, in non-mobile or fixed systems both the transmitters and receivers are located at fixed points in the area. Fixed cellular networks provide a financially attractive alternative to the construction of conventional wired networks in developing countries, where no

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Q: Comparison between conventional cellular radio system and satellite based cellular radio system?
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