What are the basic modulations in digital communications?
Answer:
ASK, FSK, and PSK are three basic modulations in digital communications.
ASK: Different levels of carrier amplitude are used to represent digital data.
FSK: Different carrier frequencies are used to represent digital data.
PSK: The phases of a carrier, not the change of the phase, are used to represent digital data.
QAM: A combination of ASK and PSK changes the levels of carrier amplitude and phase to form waveforms of different signal elements.
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