Simon Haykin
Abstract: Cognitive radio is viewed as a novel approach for improving the utilization of a precious natural resource: the radio electromagnetic spectrum.
The cognitive radio, built on a software-defined radio, is defined as an intelligent wireless communication system that is aware of its environment and uses the methodology of understanding-by-building to learn from the environment and adapt to statistical variations in the input stimuli, with two primary objectives in mind:
highly reliable communication whenever and wherever needed;
efficient utilization of the radio spectrum. Following the discussion of interference temperature as a new metric for the quantification and management of interference, the paper addresses three fundamental cognitive tasks.
Radio-scene analysis.
Channel-state estimation and predictive modeling.
Transmit-power control and dynamic spectrum management. This paper also discusses the emergent behavior of cognitive radio.
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