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Which of the following does not hold true for MLSE?

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Which of the following does not hold true for MLSE?

(a) Minimizes probability of sequence error

(b) Require knowledge of channel characteristics

(c) Requires the statistical distribution of noise

(d) Operates on continuous time signal

I got this question during an interview.

My question comes from Equalization Techniques in portion Equalization, Diversity and Channel Coding of Wireless/Mobile

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Correct choice is (d) Operates on continuous time signal

For explanation: Matched filter operates on the continuous time signal, whereas maximum likelihood sequence estimation (MLSE) equalizer and channel estimator rely on discretized samples. MLSE is optimal in the sense that it minimizes the probability of sequence error.

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