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What is the minimum number of radios required for cooperative location awareness?

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What is the minimum number of radios required for cooperative location awareness?

(a) One

(b) Two

(c) Three

(d) Four

I have been asked this question by my college director while I was bunking the class.

The query is from Environment Awareness in section Location and Environment Awareness in Cognitive Radio of Cognitive Radio

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Best answer
Correct answer is (b) Two

To elaborate: In cooperative location awareness, at least two radios are required for operation. Before ranging, the two radios bargain or offer feedback to each other during the ranging parameter setup stage. The next step is to carry out two way ranging.

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