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Which among the following is the impact of primary user interference in the physical layer?

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Which among the following is the impact of primary user interference in the physical layer?

(a) High bit error rate

(b) High delay

(c) High collision

(d) High energy demand

I have been asked this question in examination.

I would like to ask this question from Next Generation Wireless Network topic in section Next Generation Wireless Network of Cognitive Radio

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The correct answer is (a) High bit error rate

Explanation: The effect of primary user interference in the physical layer is a high bit error rate. It can be mitigated by adjusting the coding dynamically. It also can be resolved by allowing higher layers to tackle interference for a period of time.

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