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The coherent interaction of signals in UWB arriving by many paths causes ____________

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The coherent interaction of signals in UWB arriving by many paths causes ____________

(a) Ricean fading

(b) Nakagami fading

(c) Rayleigh fading

(d) Multicast fading

The question was posed to me during an interview.

This intriguing question originated from Ultra-Wideband Technologies topic in division Satellite Systems & Recent Advances of Wireless/Mobile

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Right choice is (c) Rayleigh fading

The best I can explain: The coherent interaction of signals arriving by many paths causes the Rayleigh or multipath fading in RF communications. Inside buildings, when continuous sine waves are transmitted wherein the channels exhibit multipath differential delays in the nanosecond range, the multipath fading occurs naturally.

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