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Digital Signal Processing 101 by Michael Parker

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CHAPTER 13Analog and TDMA Wireless Communications

The first mobile phone systems were based on analog technology. Developed in the 1970s, this system in the United States was known as the American mobile phone system (AMPS). Similar systems were developed in Europe and Japan. These are known as first generation, or “1G,” systems. What differentiated these systems from previous wireless systems (police or public service radio, citizens’ band radio, military systems) was the concept of frequency reuse. Because these systems reused frequency channels, enough frequency was available that each pair of users could be assigned their own, private, communication link. Once the call was finished, this frequency channel could be assigned to other users. ...

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