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What is the terminology used when xG base-station is involved in gathering sensing information?

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What is the terminology used when xG base-station is involved in gathering sensing information?

(a) Cumulative

(b) Centralized

(c) Distributed

(d) Aggregated

I have been asked this question during an online interview.

Question is from Next Generation Wireless Network topic in section Next Generation Wireless Network of Cognitive Radio

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Right option is (b) Centralized

The explanation: Cooperation detection can be carried out with a centralized structure or with a distributed structure. Centralized cooperation detection involves the collection of sensing information by the xG base station to determine spectrum holes. Distributed cooperation detection detects spectrum holes by using information exchanged by xG users.

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