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What do you call an attenuation that occurs over many different wavelengths of the carrier?

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What do you call an attenuation that occurs over many different wavelengths of the carrier?

(a) Rayleigh fading

(b) Ricean fading

(c) Wavelength fading

(d) Slow fading

The question was posed to me in unit test.

I need to ask this question from Rayleigh and Ricean Distribution topic in section Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

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Correct option is (d) Slow fading

Explanation: Slow fading does not vary quickly with the frequency. It originates due to effect of mobility. Slow fading is the result of signal path change due to shadowing and obstructions such as tree or buildings etc.

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