1. FCC, Spectrum Policy Task Force, FCC Document ET Docket No. 02-135, 2002
2. FCC, Facilitating opportunities for flexible, efficient and reliable spectrum use employing cognitive radio technologies: Notice of proposed rulemaking and order, FCC Document ET Docket No. 03-108, 2003
3. Mitola J, Maquire J, Gerald Q. Cognitive radio: Making software radios more personal. IEEE Pers Commun, 1999, 6: 13–18
4. Feng Z, Zhang Q, Tian F, et al. Novel research on cognitive pilot channel in cognitive wireless network. Wireless Pers Commun, 2012, 62: 455–478
5. FCC and states jointly develop a Nationwide Database of broadband deployment activities,
http:transition.fcc.gov/Bureaus/CommonCarrier/NewsReleases/2000/nrcc0030.html