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Radio spectrum is the basic resource to carry information for wireless networks and cyberphysical system (CPS) relies on wireless networks for devices control and information backhaul. But, the increasingly CPS wireless applications badly affects spectrum scarce situations. For the existing spectrum allocation schemes, an efficient way against spectrum scarcity is considered to be dynamic spectrum access (DSA). Cognitive femtocells, with spectrum environment observation and parameters adaption abilities, can access and share more valuable spectrum dynamically to support massive wireless service deployment.

Keywords

Cognitive Radio, Femtocells, Duty Cycle.
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