Discussion
What follows if the signal bandwidth exceeds the coherence bandwidth?
Answer: D
A wide signal sees different attenuation and phase across its own spectrum, producing intersymbol interference that must be corrected by an equaliser or avoided by using many narrow subcarriers. That is precisely why orthogonal frequency division multiplexing was adopted for broadband wireless. Flat fading is the opposite case, the channel remains usable with the right modulation, and the depth of fading is not reduced. Matching the modulation to the channel's dispersion is the central design decision in a wireless system.
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