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In orthogonal signalling as k increase there is

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In orthogonal signalling as k increase there is

(a) Improved error performance

(b) Degraded error performance

(c) Improved bandwidth

(d) None of the mentioned

This question was addressed to me in an online quiz.

This interesting question is from Waveform Coding in portion Channel Coding of Digital Communications

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The correct choice is (a) Improved error performance

To explain I would say: In orthogonal signalling as k increases there is improved error performance or a reduction in required Eb/N0 at the expense of bandwidth.

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