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Question 20273
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Principles of Communication: Modulation MCQ

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ModulationEasyQuestion 20273

Question

Phase modulation (PM) varies the _______ of the carrier in proportion to the message.
  1. A
    Amplitude
  2. B
    Frequency
  3. C
    Phase
    Correct
  4. D
    Power

Correct answer

Phase

Explanation

PM: φ(t) = φ₀ + kpm(t). PM and FM are closely related — differentiating a PM signal gives FM. Most modern cellular systems use phase-based modulation (QPSK, QAM).

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