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Choosing a closely packed signal subset from any regular lattice or array of candidate points is called as

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Choosing a closely packed signal subset from any regular lattice or array of candidate points is called as

(a) Optimum signal constellation boundaries

(b) Higher density lattice structures

(c) Trellis coded modulation

(d) None of the mentioned

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Question is from Trellis Coded Modulation topic in portion Modulation and Coding Trade-off of Digital Communications

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Correct answer is (a) Optimum signal constellation boundaries

Easy explanation: Optimum signal constellation boundaries are obtained by choosing closely packed signal subset from any regular lattice or array of candidate points.

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