Discussion
Assertion (A): Assertion: Pulse position modulation is more efficient in power than pulse width modulation.
Reason (R): Reason: All its pulses are of the same short duration.
Select the correct answer from the options below.
Answer: A
Both are true and the second is the reason: identical short pulses mean the average transmitted power is low and independent of the modulation, whereas a width-modulated train's power rises with its average duty cycle. The efficiency is bought with a stricter timing requirement, which is the standard shape of these trades. Where a scheme's average power does not depend on the message, the transmitter can be sized for the average rather than the worst case.
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