When radio meets software -- Radio frequency spectrum and regulation -- Digital communication fundamentals for cognitive radio -- Spectrum sensing and identification -- Spectrum access and sharing -- Agile transmission techniques -- Reconfiguration, adaptation, and optimization -- Fundamentals of communication networks -- Cognitive radio network architectures -- User ciiperative communications -- Information theoretical limits on cognitive radio networks -- Cross-layer optimization for multihop cognitive radio networks -- Defining cognitive radio -- Cognitive fadio for broadband wireless access in TV bands : the IEEE 802.22 standards -- Cognitive radio network security -- Public safety and cognitive radio -- Auction-based spectrum markets in cognitive radio networks -- GNU radio for cognitive radio experimentation -- Cognitive radio platforms and testbeds -- Cognitive radio evolution