2FCC,"Spectrum policy task force report," in Proceedings of the Federal Communications Commission (FCC' 02),Washington,DC,USA,Nov.2002.
3M.H.Islam,C.L.Koh,S.W.Oh,et al.,"Spectrum survey in Singapore:occupancy measurements and analysis," in Proceedings of the 3rd International Conference on Cognitive Radio Oriented Wireless Networks and Communications (CROWNCOM ' 08),Singapore,May 2008.
4Mitola J.and Maguire G.Q.,"Cognitive radio:making software radios more personal," IEEE Personal Communications,1999,6(4):13-18.
5Haykin S.,"Cognitive radio:brain-empowered wireless communications," IEEE Transactions on Communications,2005,23(2):201-220.
6Devroye N.,Mitran P.,and Tarokh V.,"Achievable rates in cognitive radio channels," IEEE Transactions on Information Theory,2006,52(5):1813-1827.
7802.22 Working Group,"IEEE802.22.1 Standard for the Enhanced Interference Protection of the Licensed Devices,"[Online].Available:http:// grouper.ieee.org/groups/802/22/,Nov.2010.
8Stevenson C.,Chouinard G.,Lei Z.D.,Hu W.D.,Shell H.S.,and Caldwell W.,"IEEE 802.22:the first cognitive radio wireless regional area network standard," IEEE Communications Magazine,2009,47 (1):130-138.
10Sonnenschein A.and Fishman P.M.,"Radiometric detection of spread spectrum signals in noise of uncertainty power," IEEE Transactions on Aerospace and Electronic Systems,1992,28 (3):654-660.
