Some Basic Concepts from wiki:
http://en.wikipedia.org/wiki/Cognitive_radio
Communication effectively, while avoiding interference with licensed and licensed exempt users. This alternation of parameters is based on the active monitoring of several factors in the external and internal radio environment, such as radio frequency spectrum, user behavior and network state.
Virginia Tech guy defines:"a software defined radio with a cognitive engine brain".
A article link talking about more practical and regulatory considerations.
Some reading to keep up with Cognitive Radio\
June 16, 2011
From Spectral Holes (A blog on Cognitive Radio)
http://spectralholes.blogspot.com/
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