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Which among the following is a definition of spectrum efficiency?

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Which among the following is a definition of spectrum efficiency?

(a) Number of bits per Hertz of bandwidth

(b) Number of bauds per Hertz of bandwidth

(c) Number of Hertz per bit of symbol sequence

(d) Number of Hertz per bit of symbol sequence

I have been asked this question in examination.

My doubt is from Next Generation Wireless Network topic in portion Next Generation Wireless Network of Cognitive Radio

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Correct choice is (a) Number of bits per Hertz of bandwidth

Explanation: Modulation designers describe spectrum efficiency in terms of the number of bits per Hertz of bandwidth. It is used as a metric for measuring the performance of modulation techniques.

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