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Irreducible BER floor is created in frequency selective channels due to ____________

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Irreducible BER floor is created in frequency selective channels due to ____________

(a) Intersymbol interference

(b) Random spectral spreading

(c) Time varying Doppler spread

(d) Blind speed

I have been asked this question in semester exam.

This interesting question is from Modulation Performance in Fading and Multipath Channels in portion Modulation Techniques for Mobile Radio of Wireless/Mobile

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Right option is (a) Intersymbol interference

To explain I would say: Frequency selective fading is caused due to multipath delay spread which causes intersymbol interference. It results in an irreducible BER floor for mobile systems.

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