A cognitive radio is
|“||a radio that can change its transmitter parameters based on interaction with the environment in which it operates.||”|
Such radios "can autonomously detect the most appropriate RF communications links and switch to them. . . . Cognitive radios can identify and utilize all transmitting and receiving possibilities within a vicinity. . . . Cognitive radios and the related issue of developing the software stack on top of those radios to enable seamless session handovers is an area of active investigation.
|“||Cognitive radio has the capability to modulate various parameters, including frequency and power, intelligently and in real time. These systems could operate on, for instance, emergency frequencies while they are not being used, or put out power just short of interfering with the next broadcaster a few miles away.||”|