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When a user’s moving, the user’s velocity causes shift in frequency. This is called as

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When a user’s moving, the user’s velocity causes shift in frequency. This is called as

(a) Doppler shift

(b) Frequency shift

(c) Velocity shift

(d) None of the mentioned

I got this question during an interview for a job.

I'm obligated to ask this question of Signal Time Spreading topic in division Fading Channels of Digital Communications

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Right option is (a) Doppler shift

The best explanation: When a user’s moving, the user’s velocity causes shift in frequency of the transmitted signal along each signal path. This is called as Doppler shift.

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