technologies







The wireless technologies have had very much summit and development in the latter years. One of that has had a great development has been the cellular telephony.
From his beginnings at the end of the 70 it has revolutionized enormously the activities that we realize every day. The cell phones have turned into a basic tool for the common and business people; it makes them feel surer and makes them more productive.
In spite of the fact that the cellular telephony was concebida strictly for the voice, the cellular technology of today is capable of offering another type of services, as information, audio and video with some limitations. Nevertheless, the wireless telephony of the tomorrow will make possible applications that need a major consumption of bandwidth.

The great idea of the cellular system is the division of the city in small cells or cells. This idea allows the re-utilization of frequencies across the city, with what thousands of persons can use the telephones at the same time. In a typical system of analogous telephony of the United States, the company receives 800 frequencies to use in every city. The company divides the city in cells. Every cell generally has a size of 26 square kilometres. The cells are normally designed as hexagons (figures of six sides), in a great grid of hexagons.
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Every cell has a base station that consists of a tower and a small building that contains the equipment of radio.