Irreducible BER floor is created in non frequency selective channels due to ____________(a) Intersymbol interference(b) Multipath time delay(c) Time varying Doppler spread(d) Blind speedThis question was posed to me by my school teacher while I was bunking the class.My doubt is from Modulation Performance in Fading and Multipath Channels in section Modulation Techniques for Mobile Radio of Wireless/Mobile

Irreducible BER floor is created in non frequency selective channels d

1.	Irreducible BER floor is created in non frequency selective channels due to ____________(a) Intersymbol interference(b) Multipath time delay(c) Time varying Doppler spread(d) Blind speedThis question was posed to me by my school teacher while I was bunking the class.My doubt is from Modulation Performance in Fading and Multipath Channels in section Modulation Techniques for Mobile Radio of Wireless/Mobile
Answer» Correct choice is (c) TIME varying Doppler spread Easiest EXPLANATION: Even if a mobile channel is not frequency selective, the TIE varying Doppler spread due to motion creates an irreducible BER floor. It is caused due random SPECTRAL spreading.

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