Cognitive radio: brain-empowered wireless communications
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Résumé
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.
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La notice
- Revue
- IEEE Journal on Selected Areas in Communications
- Thématique
- Cognitive Radio Networks and Spectrum Sensing
- Domaine
- Computer Science
- Établissements canadiens
- McMaster University
- Organismes subventionnaires
- —
- Mots-clés
- 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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