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Simplex : Transmission is only in one way. By the other is impossible.
This's used in Telemetry.
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Half_Duplex : Transmission is possible by two directions but not
at the same time.This's used in data transmission.
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Full_Duplex : Transimission is possible by two direction independently.
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Modulation : Modify a signal to make it more easy to transmitt.
Radiaton is better at high frequency .
Spectral division allows Frequency Multiplex.
There are different ways to modulate :
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