Tín hiệu trong các mạng viễn thông P12

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Tín hiệu trong các mạng viễn thông P12

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SIGNALI R MOBILE TELECOMMUNICATIONS Cellular mobile telecommunications is one of the most important telecommunication developments of the last decade. The technical concepts underlying this type of communications were developed by Bell Laboratories [1,2], and implemented in the ~dv~~~ed rn~bi~e telephu~e service intern (AMPS). All current cellular systems in the U.S. are descendants of AMPS. Early mobile stations (MS) were designed as car phones. They were too bulky to be carried around, and had to be powered by the battery of the car. Today, there are compact lightweight MSs with internal rechargeable batteries. ...

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