____________ is a modulation technique that combines two different amplitude combinations with eight different phase combinations modulation to send four bits per symbol.
A)quadrature amplitude modulation
B)time division multiplexing
C)synchronous digital line control
D)pulse code modulation
E)baseband signaling

Question

Quizplus · Accepted Answer

The modulation technique described in the question is quadrature amplitude modulation (QAM), which uses both amplitude and phase variations to encode data. QAM can transmit multiple bits per symbol, and in this case, it is stated that four bits are sent per symbol. Time division multiplexing (B) is a different technique used to transmit multiple signals over the same communication channel by dividing the available bandwidth into time slots. Synchronous digital line control (C) is a protocol used in ISDN networks to coordinate communication between devices. Pulse code modulation (D) is used to digitize analog signals, and baseband signaling (E) refers to transmission of a signal without modulation.

____________ Is a Modulation Technique That Combines Two Different Amplitude