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Time diversity repeatedly transmits information at time spacings that exceed ___________

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Time diversity repeatedly transmits information at time spacings that exceed ___________

(a) Coherence bandwidth

(b) Dwell time

(c) Run time

(d) Coherence time

This question was posed to me in unit test.

Enquiry is from Diversity Techniques in division Equalization, Diversity and Channel Coding of Wireless/Mobile

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Right answer is (d) Coherence time

The best I can explain: Time diversity repeatedly transmits information at time spacings that exceed coherence time of the channel. Thus, multiple repetitions of the signal will be received with independent fading conditions, thereby providing for diversity.

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