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: /spl middot/ highly reliable communication whenever and wherever needed; /spl middot/ 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 work also discusses the emergent behavior of cognitive radio.
Keywords
Cognitive radioComputer scienceRadio resource managementWirelessSoftware-defined radioInterference (communication)Transmitter power outputRadio spectrumTransmitterChannel (broadcasting)Spectrum managementTelecommunicationsWireless networkCognitive networkMetric (unit)Electromagnetic interferenceControl channelComputer networkTransmission (telecommunications)Engineering
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Publication Info
- Year
- 2005
- Type
- article
- Volume
- 23
- Issue
- 2
- Pages
- 201-220
- Citations
- 11873
- Access
- Closed
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Cite This
S. Haykin
(2005).
Cognitive radio: brain-empowered wireless communications.
IEEE Journal on Selected Areas in Communications
, 23
(2)
, 201-220.
https://doi.org/10.1109/jsac.2004.839380
Identifiers
- DOI
- 10.1109/jsac.2004.839380