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Which of the following is a drawback of zero forcing algorithm?

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Which of the following is a drawback of zero forcing algorithm?

(a) Long training sequence

(b) Amplification of noise

(c) Not suitable for static channels

(d) Non zero ISI

I had been asked this question in final exam.

Enquiry is from Algorithms for Adaptive Equalization in division Equalization, Diversity and Channel Coding of Wireless/Mobile

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Correct choice is (b) Amplification of noise

The best explanation: The zero forcing algorithm has the disadvantage that the inverse filter may excessively amplify noise at frequencies where the folded channel spectrum has high attenuation.

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