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____ proposes the presence of secondary users for improved spectral efficiency.

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____ proposes the presence of secondary users for improved spectral efficiency.

(a) Cognitive radio

(b) Software defined radio

(c) Software capable radio

(d) Programmable digital radio
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The correct answer is (a) Cognitive radio

Explanation: Cognitive radio technologies support the presence of lower priority secondary users. This involves sensing the environment to find unused available spaces in the licensed spectrum for communication. It aims at effective usage of frequency, time and energy.
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