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FDMA (Frequency Division Multiple Access) is to be allocated to the wireless cellular telephone communication frequency band is divided into 30 channels, each channel can transmit voice calls, digital services and digital data. Is the analog frequency division multiple access advanced mobile phone service (AMPS) in a basic technology, is North America's most widely used cellular phone system. Frequency-division multiple access, each channel can only be assigned to each user. Frequency division multiple access communication system is also used for all access (TACS).

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