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Which determines the error performance in TCM?

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Which determines the error performance in TCM?

(a) Reduced distance

(b) Free distance

(c) Bandwidth

(d) None of the mentioned

This question was addressed to me in a job interview.

I need to ask this question from Trellis Coded Modulation topic in portion Modulation and Coding Trade-off of Digital Communications

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Right choice is (b) Free distance

To explain I would say: Free distance which is the minimum distance between members of set of allowed code sequences determines the error performance.

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