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Which of the reception problems below that is not due to multipath?

Which of the reception problems below that is not due to multipath? Correct Answer Slow fading

Slow fading arises when the coherence time of the channel is large relative to the delay requirement of the application. Slow fading is caused by events such as shadowing, where a large obstruction such as a hill or large building obscures the main signal path between the transmitter and the receiver.

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