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Which among the following techniques requires prior knowledge of the primary signal?

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Which among the following techniques requires prior knowledge of the primary signal?

(a) Matched filter detection

(b) Energy detection

(c) Cooperation detection

(d) Cyclostationary detection

This question was addressed to me in semester exam.

My question comes from Next Generation Wireless Network topic in chapter Next Generation Wireless Network of Cognitive Radio

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The correct option is (a) Matched filter detection

For explanation I would say: The matched filter detection method requires prior knowledge of the signal to be transmitted by the primary user such as the pulse shape, the packet format, and the order and modulation type. If the information is available, then the matched filter is the most compatible detection method. Matched filter can maximize the signal to noise ratio.

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