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Which of the following is not an effect caused by multipath in radio channel?

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Which of the following is not an effect caused by multipath in radio channel?

(a) Rapid changes in signal strength

(b) Random frequency modulation

(c) Power of base station

(d) Time dispersion

This question was addressed to me in an online quiz.

The origin of the question is Small- Scale Multipath Propagation topic in portion Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

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The correct option is (c) Power of base station

Easiest explanation: Rapid changes in signal strength over a small travel distance are caused due to multipath. It causes random frequency modulation due to varying Doppler shifts on different multipath signals. Time dispersion is also caused by multipath propagation delays.

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