Mobile Phone Technology

The mobile or cellular telephone is a means of communication by wireless telephone. This means of communication has become widespread in the late 1990s. The technology benefits from improvements associated electronic components, including their miniaturization, which allows phones to acquire functions once reserved to computers. The telephone itself may be named "mobile" "mobile phone", "portable", "cell phone" (North America), 'cell' (in Quebec in the vernacular), "Natel" (Switzerland), "GSM" (Belgium), "vini" (French Polynesia). When it is equipped with advanced features is a smart phone or smart phone. Mobile telephony is based on the radio, that is to say the voice using radio waves (frequencies in the 900 and 1800 MHz) between a base relay which covers an area several tens of kilometers in radius and the mobile phone user with a unique area code. The first mobile systems operating in analog mode. The terminals were large, only usable in cars where they occupied a portion of the trunk and took advantage of the power of the vehicle. The current mobile systems operate in digital mode: the voice is sampled, digitized and transmitted as bits, then re-synthesized at the reception. Advances in microelectronics have reduced the size of mobile phones in a pocket format. In order to find with number , each subscriber is given a number. The advantages of digital systems is the falling price of the terminals, increasing services, increasing the number of subscribers and a better quality of reception of voice. The base transmission is spread over the territory in a pattern of cells. Each database uses a different frequency group of her neighbors. The same frequencies are reused at a sufficient distance so as not to create interference.