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Doppler spread is a range of frequencies over which received Doppler spread is _______

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Doppler spread is a range of frequencies over which received Doppler spread is _______

(a) Zero

(b) Non zero

(c) Infinite

(d) One

I had been asked this question by my college professor while I was bunking the class.

This interesting question is from Parameters of Mobile Multipath Channels in portion Mobile Radio Propagation: Small – Scale Fading and Multipath of Wireless/Mobile

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Right answer is (b) Non zero

The explanation is: Doppler spread is a range of frequencies over which received Doppler spectrum is essentially non-zero. It is a measure of spectral broadening caused by time rate of change of mobile radio channel.

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