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Which among the following is done to establish communication?

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Which among the following is done to establish communication?

(a) Legacy radio reconfigures for communication

(b) Cognitive radio uses different waveform for communication

(c) Cognitive radio adapts legacy radio waveform

(d) Legacy radio adapts cognitive radio waveform

I have been asked this question in a job interview.

My question is based upon Location Awareness topic in section Location and Environment Awareness in Cognitive Radio of Cognitive Radio

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Right option is (c) Cognitive radio adapts legacy radio waveform

The best I can explain: Communication between cognitive and legacy radio may be achieved only if the former uses the waveform supported by legacy radio. Legacy radio does not have re-configurability features.

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