From Wikipedia (Cognitive Radio)
Cognitive radio is a paradigm for wireless communication in which either a network or a wireless node changes its transmission or reception parameters to communicate efficiently avoiding interference with licensed or unlicensed users. This alteration of parameters is based on the active monitoring of several factors in the external and internal radio environment, such as radio frequency spectrum, user behaviour and network state.
Distinctions are made between Full Cognitive Radio, Spectrum Sensing Cognitive Radio, Licensed Band Cognitive Radio, and Unlicensed Band Cognitive Radio. Not to be confused with Intelligent Antennas.
