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Who was the first to solve the problem of ISI?

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Who was the first to solve the problem of ISI?

(a) Manchester

(b) Faraday

(c) Graham Bell

(d) Nyquist

I got this question by my college director while I was bunking the class.

This intriguing question comes from Pulse Shaping Techniques topic in division Modulation Techniques for Mobile Radio of Wireless/Mobile

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The correct option is (d) Nyquist

The explanation: Nyquist was the first to solve the problem of ISI. He overcome the problem of ISI while keeping the transmission bandwidth low. He observed that ISI can be completely nullified if at every instant, the response due to all symbols except the current symbol is equal to zero.

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