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Which among the following is the most practical method to identify spectrum holes?

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Which among the following is the most practical method to identify spectrum holes?

(a) Detect primary user transmission

(b) Detect primary user receiving information

(c) Detect secondary user transmission

(d) Detect secondary user receiving information

The question was asked in an online quiz.

This key question is from Next Generation Wireless Network topic in section Next Generation Wireless Network of Cognitive Radio

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The correct answer is (a) Detect primary user transmission

The best explanation: The detection of primary users receiving information within the communication range of xG users is considered as the most efficient means for determining spectrum holes. However this is not always feasible as it is laborious to measure the channel between a transmitter and a primary receiver. Hence sensing is predominantly carried out by detecting the transmission operation of primary users.

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