期刊
IEEE JOURNAL ON SELECTED AREAS IN COMMUNICATIONS
卷 23, 期 2, 页码 201-220出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/JSAC.2004.839380
关键词
awareness; channel-state estimation and predictive modeling; cognition; competition and cooperation; emergent behavior; interference temperature; machine learning; radio-scene analysis; rate feedback; spectrum analysis; spectrum holes; spectrum management; stochastic games; transmit-power control; water filling
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 M 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. 1) Radio-scene analysis. 2) Channel-state estimation and predictive modeling. 3) Transmit-power control and dynamic spectrum management. This paper also discusses the emergent behavior of cognitive radio.
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