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The radio has been a large-scale development in recent years, with the advent of GSM (Global System for Mobile Communications) mobile phone. This growth is primarily due to the emergence of internationally accepted standards which facilitated the large-scale deployment, and also control technologies involving telecommunications, electronics and computers. Deploy these networks has been a great challenge for operators who have to master radio waves to completely new applications in relation to what was done since the beginning of the century. The authors went from broadcasting, personalized information and requirements for quality of service.
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