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Which of the following do not impact bit error rate in mobile communication systems?

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Which of the following do not impact bit error rate in mobile communication systems?

(a) Mobile velocity

(b) Channel delay spread

(c) Modulation format

(d) Base station

I have been asked this question in a job interview.

Enquiry is from Modulation Performance in Fading and Multipath Channels topic in chapter Modulation Techniques for Mobile Radio of Wireless/Mobile

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Best answer
The correct option is (d) Base station

Best explanation: The mobile velocity, channel delay spread, interference levels and modulation formats all independently impact the raw bit error rate in mobile communication systems. And simulation is a powerful way to design or predict the performance of wireless communication links.

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