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Which among the following affects the channel capacity of spectrum holes?

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Which among the following affects the channel capacity of spectrum holes?

(a) Interference at nearby primary users

(b) Interference at nearby xG users

(c) Distance between the xG user and primary base-station

(d) Distance between the xG user and xG base-station

The question was asked in examination.

I want to ask this question from The xG Network Architecture topic in chapter Next Generation Wireless Network of Cognitive Radio

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Correct choice is (a) Interference at nearby primary users

The explanation is: The amount of primary users prone to interference caused by xG users in unused spectrum holes of licensed spectrum band determines the channel capacity of spectrum holes. Interference avoidance with primary users is an important criterion in the design of xG architecture.

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