Discussion
Which family does phase modulation belong to?
Answer: C
PM belongs to angle modulation, alongside FM, because it varies an argument of the carrier's cosine rather than its multiplier. Amplitude modulation varies the multiplier. Pulse modulation encodes samples in the properties of pulses. And spread spectrum deliberately widens a signal far beyond its information bandwidth. The family classification predicts the constant envelope, the Bessel spectrum and the limiter's usefulness all at once.
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