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If coherence bandwidth is smaller than the bandwidth of the signal, _____ fading occurs.

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If coherence bandwidth is smaller than the bandwidth of the signal, _____ fading occurs.

(a) Flat

(b) Frequency selective

(c) Fast fading

(d) Time selective

I have been asked this question during an interview.

This key question is from Signal Time Spreading in portion Fading Channels of Digital Communications

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Correct answer is (b) Frequency selective

To elaborate: Frequency selective fading occurs when coherence bandwidth is smaller than the bandwidth of the transmitted signal.

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