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Which among the following is not an advantage of avoiding contiguous spectrum bands for transmission?

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Which among the following is not an advantage of avoiding contiguous spectrum bands for transmission?

(a) Low delay

(b) Low power consumption

(c) Low interference

(d) Mitigation of quality of service degradation

This question was addressed to me in final exam.

My question is from Next Generation Wireless Network topic in division Next Generation Wireless Network of Cognitive Radio

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Right choice is (d) Mitigation of quality of service degradation

Easiest explanation: The primary advantage of using a contiguous spectrum band is the mitigation of the quality of service degradation. This is because when a user has to vacate a spectrum band on the arrival of the primary user, the other bands continue to transmit maintaining communication. Low power is consumed in each band and less interference with the primary user is achieved.

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