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What is the purpose of in-band sensing?

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What is the purpose of in-band sensing?

(a) Interference avoidance

(b) Sharing spectrum information

(c) Sharing spectrum resources

(d) Spectrum handoff

I had been asked this question by my college professor while I was bunking the class.

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

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Right answer is (a) Interference avoidance

The explanation is: Spectrum sensing identifies unused spectrum holes that are available for transmission for cognitive radio users. During transmission, the cognitive radio users continue to monitor the spectrum band. They also sense other users of the primary network in order to avoid interference. Spectrum sensing carried out during transmission is called in-band sensing.

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