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Finally, I would expect the price wars to continue as wireless access seeks its natural and acceptable price level in the face of growing competition among the players.
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In October 1945, Arthur C. Clarke published a paper in Wireless World entitled, Extra-Terrestrial-Relays: Can Rocket Stations Give WorldWide Radio Coverage In his paper, Clarke proposed the concept of an orbiting platform that would serve as a relay facility for radio signals sent to it that could be turned around and retransmitted back to Earth with far greater coverage than was achievable through terrestrial transmission techniques. His platform would orbit at an altitude of 42,000 kilometers (25,200 miles) above the equator, where it would orbit at a speed identical to the rotation speed of the Earth. As a consequence, the satellite would appear to be stationary to Earth-bound users. Satellite technology may prove to be the primary communications gateway for regions of the world that do not yet have a terrestrial wired infrastructure, particularly given the fact that they are now capable of delivering broadband services. In addition to the United States, the largest markets for satellite coverage are Latin America and Asia, and particularly Brazil and China.
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Clarke s concept of a stationary platform in space forms the basis for today s geostationary or geosynchronous satellites. Ringing the equator like a string of pearls, these devices provide a variety of services including 64 Kbps voice, broadcast television, video-on-demand services, broadcast and interactive data, and point-of-sale applications, to name a few. And while satellites are viewed as technological marvels, the real magic lies more with what it takes to harden them for the environment in which they must operate and what it takes to get them there than it does their actual operational responsibilities. Satellites, in effect, are nothing more than a sophisticated collection of assignable, on-demand repeaters in a sense, the world s longest local loop. From a broadcast perspective, satellite technology has a number of advantages. First, its one-to-many capabilities are unequaled. Information from a central point can be transmitted to a satellite in geostationary
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orbit; the satellite can then rebroadcast the signal back to Earth, covering an enormous service footprint. Because the satellites appear to be stationary, the Earth stations actually can be. One of the most common implementations of geosynchronous technology is seen in the very small aperture terminal (VSAT) dishes that have sprung up like mushrooms on a summer lawn. These dishes are used to provide both broadcast and interactive applications; the small DBS dishes used to receive TV signals are examples of broadcast applications, while the dishes seen on the roofs of large retail establishments, automobile dealerships, and convenience stores are typically (although not always) used for interactive applications such as credit card verification, inventory queries, e-mail, and other corporate communications. Some of these applications use a satellite downlink but rely on a telco return for the upstream traffic; that is, they must make a telephone call over a land line to offer two-way service. One disadvantage of geosynchronous satellites has to do with their orbital altitude. On the one hand, because they are so high, their service footprint is extremely large. On the other hand, because of the distance from the Earth to the satellite, the typical transit time for the signal to propagate from the ground to the satellite (or back) is about half a second, which is a significant propagation delay for many services. Should an error occur in the transmission stream during transmission, the need to detect the error, ask for a retransmission, and wait for the second copy to arrive could be catastrophic for delay-sensitive services like voice and video. Consequently, many of these systems rely on forward error correction transmission techniques that allow the receiver to not only detect the error but correct it as well. An interesting observation is that because the satellites orbit above the equator, dishes in the northern hemisphere always face south. The farther north a user s receiver dish is located, the lower it has to be oriented. Where I live in Vermont, the satellite dishes are practically lying on the ground they almost look as of they are receiving signals from the depths of the mountains instead of a satellite orbiting 23,000 miles above the Earth.
Low/Medium Earth Orbit Satellites (LEO/MEO)
In addition to the geosynchronous satellite arrays, there are a variety of lower orbit constellations deployed known as low and medium Earth
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