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The TCM decoder uses

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The TCM decoder uses

(a) Minimum likelihood detector

(b) Maximum likelihood detector

(c) Does not use redundant bits

(d) None of the mentioned

I had been asked this question in homework.

This intriguing question comes from Trellis Coded Modulation topic in section Modulation and Coding Trade-off of Digital Communications

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Correct choice is (b) Maximum likelihood detector

To elaborate: The task of convolutional decoder is to estimate the path that the message had traversed through the encoding trellis using maximum likelihood detector.

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