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Which among the following is a factor of concern for in-band sensing?

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Which among the following is a factor of concern for in-band sensing?

(a) Identification of stop period for the search process

(b) Identification of the start period for the search process

(c) Selection of spectrum for evaluation

(d) Selection of duration for transmission

I have been asked this question during an online exam.

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

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Correct option is (d) Selection of duration for transmission

Easy explanation: In-band sensing is mainly concerned with interference avoidance. Sensing time and transmission time are the major factors computed by in-band sensing. The duration and the frequency at which sensing should be carried out to achieve satisfying sensing accuracy is determined by in-band sensing.

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