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Which is the primary cost for degradation of error performance?

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Which is the primary cost for degradation of error performance?

(a) Loss in signal to noise ratio

(b) Signal distortion

(c) Signal distortion & Loss in signal to noise ratio

(d) None of the mentioned

I had been asked this question in final exam.

My question is based upon Link Budget Analysis topic in portion Communication Link Analysis of Digital Communications

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Correct answer is (c) Signal distortion & Loss in signal to noise ratio

For explanation I would say: There are two primary causes for the degradation of error performance. They are loss in signal to noise ratio and the second is signal distortion caused by intersymbol interference.

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