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What does the term spectrum heterogeneity mean in the context of xG architecture?

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What does the term spectrum heterogeneity mean in the context of xG architecture?

(a) Licensed band and unlicensed band

(b) UHF band and VHF band

(c) Radio band and visible light band

(d) Radio band and infrared band

The question was posed to me in homework.

Question is taken from The xG Network Architecture in chapter Next Generation Wireless Network of Cognitive Radio

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The correct answer is (a) Licensed band and unlicensed band

The explanation is: xG architecture exists in a mixed spectrum environment with licensed and unlicensed bands. Wideband access technology allows xG users to operate on both bands. xG users can communicate by using a base-station or by opting for a multi-hop connection.

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