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_______ is the square root of the second central moment of the power delay profile.

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_______ is the square root of the second central moment of the power delay profile.

(a) Mean excess delay

(b) Rms delay spread

(c) Excess delay spread

(d) Coherence time

I got this question during an online exam.

The doubt is from Parameters of Mobile Multipath Channels in portion Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

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Correct answer is (b) Rms delay spread

For explanation: The rms delay spread is the square root of the second central moment of the power delay profile. Many measurements are made at many local areas in order to determine a statistical range of multipath channel parameters for a mobile communication system over a large scale area.

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