Discussion
Match each pulse scheme with the parameter that carries the message.
List I
A. Pulse amplitude modulation
B. Pulse width modulation
C. Pulse position modulation
List II
P. Pulse height
Q. Pulse duration
R. Pulse displacement in time
Select the correct match.
Answer: B
The pairing is A-P, B-Q, C-R, and it settles the noise behaviour of all three at once: only the first puts information into amplitude, so only the first is vulnerable to amplitude noise. Naming the parameter that carries the message is the single most useful thing to establish about any modulation scheme, pulse or continuous.
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