Discussion
What is frequency diversity used against?
Answer: A
Because a multipath fade is deep only over a narrow band, a second carrier a per cent or so away is usually unaffected, so switching to it maintains the link. It also protects against equipment failure as a side benefit, since two complete radio chains are involved. Rain affects a whole band together and is not helped, and interference is a separate problem. Diversity requires independence, and frequency selective fading provides it while rain attenuation does not.
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