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What is Frequency diversity?
Answer:
If you are getting fading on particular frequency so not necessary that you will get same result on other frequency ,to simplify the issue you can transmit your signal on two frequencies aprox 100KHz different .calculate signal-to-noise ratio in two receivers and selects which is best at any instant in time .

Frequency diversity: The signal is transmitted using several frequency channels or spread over a wide spectrum that is affected by frequency-selective fading. Middle-late 20th century microwave radio relay lines often used several regular wideband radio channels, and one protection channel for automatic use by any faded channel.

i). OFDM modulation in combination with subcarrier interleaving and forward error correction,
ii). Spread spectrum, for example frequency hopping or DS-CDMA.

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