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Scarcity of frequencies means that TDMA (time-division multiple access) is being used to an increasing extent. The GSM standard for mobile phones is a classic example. User information for eight subscribers is alternately transmitted in bursts (timeslots C0 to C7) with a duration of 577 µs in a frequency channel 200 kHz wide (FIG 1). TDMA is also due to be introduced for the VHF digital link (VDL) in air-traffic control (118 to 137 MHz), starting up ...
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