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Which of the following is the first moment of the power delay profile?

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Which of the following is the first moment of the power delay profile?

(a) Rms delay spread

(b) Excess delay spread

(c) Mean excess delay

(d) Doppler spread

The question was posed to me in an online quiz.

This intriguing question originated from Parameters of Mobile Multipath Channels topic in chapter Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

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Best answer
Right answer is (c) Mean excess delay

The best explanation: Mean excess delay is the first moment of the power delay profile. It is defined from a single power delay profile which is temporal or spatial average of consecutive impulse response measurements collected and averaged over a local area.

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