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Coherence bandwidth is a statistical measure of range of frequencies over which channel is considered _______

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Coherence bandwidth is a statistical measure of range of frequencies over which channel is considered _______

(a) Time dispersive

(b) Frequency selective

(c) Time variant

(d) Flat

I have been asked this question in a national level competition.

This is a very interesting question from Parameters of Mobile Multipath Channels in portion Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

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The correct option is (d) Flat

The best I can explain: Coherence bandwidth is a statistical measure of range of frequencies over which channel is considered flat. A flat channel is a channel which passes all spectral components with approximately equal gain and linear phase.

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