Question

When ____ of N zero crossings count becomes small, a signal is considered to be present.

a.

mean

b.

correlation

c.

standard deviation

d.

variance

Posted under Cognitive Radio

Answer: (d).variance Explanation:When zero crossings are simply counted, a small variance of N zero crossings indicate a signal to be present. A disadvantage of this technique is the presence of high speed logic and lack of equalization.

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Q. When ____ of N zero crossings count becomes small, a signal is considered to be present.

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