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2. FCC, Facilitating opportunities for flexible efficient and reliable spectrum use employing cognitive radio technologies, notice of proposed rule making and order, in FCC03-322 (2003).
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4. Cognitive Radio: brain-empowered wireless communications;Haykin;IEEE J. Sel. Areas Commun.,2005
5. IEEE, 802.22 Wireless RAN, Functional requirements for the 802.22 WRAN standard, IEEE 802.22-05/0007r46 (2005).