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In TCM the signals are decoded using

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In TCM the signals are decoded using

(a) Soft decision decoders

(b) Hard decision decoders

(c) Soft & Hard decision decoders

(d) None of the mentioned

I have been asked this question by my college professor while I was bunking the class.

This is a very interesting question from Trellis Coded Modulation topic in section Modulation and Coding Trade-off of Digital Communications

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The correct option is (a) Soft decision decoders

For explanation I would say: In trellis coded modulation the noisy received signals are decoded using soft decision decoders.

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