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Which of the following is an advantage of AM systems in comparison to FM sysytems?

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Which of the following is an advantage of AM systems in comparison to FM sysytems?

(a) Occupy less bandwidth

(b) Superior performance in fading

(c) Better noise immunity

(d) Not susceptible to impulse noise

I had been asked this question by my college director while I was bunking the class.

The above asked question is from Frequency Modulation Vs. Amplitude Modulation in section Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct answer is (a) Occupy less bandwidth

To explain: AM signals are able to occupy less bandwidth as compared to FM signals, since the transmission system is linear. Small scale fading causes rapid fluctuations in the received signal. Thus, FM offers superior qualitative performance in fading when compared to AM.

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