A carrier wave is modulated with 4 amplitudes and 4 phase changes; how many bits can be represented with each signal change?
A)1
B)2
C)3
D)4

Question

Quizplus · Accepted Answer

With 4 amplitude levels and 4 phase changes, we can create 16 unique combinations (4 amplitudes x 4 phases = 16). Since each unique signal can represent a different value, and 2^4 = 16, each signal change can represent 4 bits.

A Carrier Wave Is Modulated with 4 Amplitudes and 4