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What is a measure of the maximum frequency difference for which signals are strongly correlated in amplitude?

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What is a measure of the maximum frequency difference for which signals are strongly correlated in amplitude?

(a) Coherence bandwidth

(b) Narrow bandwidth

(c) Incoherent bandwidth

(d) Wide bandwidth

I had been asked this question during an interview.

This question is from Small- Scale Multipath Propagation in chapter Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

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Correct choice is (a) Coherence bandwidth

To explain I would say: The bandwidth of the channel can be quantified by the coherence bandwidth. It is related to the specific multipath structure of channel. It is a measure of maximum frequency difference for which signals are strongly correlated in amplitude.

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