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______ controls the adaptive algorithm in an equalizer.

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______ controls the adaptive algorithm in an equalizer.

(a) Error signal

(b) Transmitted signal

(c) Received signal

(d) Channel impulse response

This question was addressed to me during a job interview.

I'm obligated to ask this question of Fundamentals of Equalization in chapter Equalization, Diversity and Channel Coding of Wireless/Mobile

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Correct choice is (a) Error signal

Easy explanation: The adaptive algorithm is controlled by the error signal. The error signal is derived by comparing the output of the equalizer and some signal which is either an exact scaled replica of the transmitted signal or represents a property of transmitted signal.

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