1. Cognitive radio: making software radios more personal
2. Cognitive radio: brain-empowered wireless communications
3. [3] ITU-R, “Definitions of software defined radio (SDR) and cognitive radio system (CRS),” Report ITU-R SM.2152, Sept. 2009.
4. [4] IEEE P802.11af, “Wireless LAN in the TV white space,” http://www.ieee802.org/11/Reports/tgaf_update.htm
5. [5] IEEE Std 802.16h-2010, “IEEE standard for local and metropolitan area networks Part 16: Air interface for broadband wireless access systems amendment 2: Improved coexistence mechanisms for license-exempt operation,” July 2010.