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What capability demand was boosted upon introduction of machine learning in cognitive radio?

(a) RF sensing

(b) Haptic sensing

(c) Knowledge acquisition

(d) Resource acquisition

This question was addressed to me in final exam.

Query is from Architecture in section Cognitive Radio Architecture of Cognitive Radio

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Right option is (c) Knowledge acquisition

Easy explanation: Availability of knowledge of a certain degree is essential in cognitive radio to extract user knowledge pertaining to information services. The repeated occurrences of similar activity are considered as learning opportunities. This is exploited by machine learning for incremental knowledge acquisition.

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