Cooperative communications for cognitive radio networks

Khaled Letaief, Wei Zhang

Research output: Contribution to journalArticle

868 Citations (Scopus)

Abstract

Cognitive radio is an exciting emerging technology that has the potential of dealing with the stringent requirement and scarcity of the radio spectrum. Such revolutionary and transforming technology represents a paradigm shift in the design of wireless systems, as it will allow the agile and efficient utilization of the radio spectrum by offering distributed terminals or radio cells the ability of radio sensing, self-adaptation, and dynamic spectrum sharing. Cooperative communications and networking is another new communication technology paradigm that allows distributed terminals in a wireless network to collaborate through some distributed transmission or signal processing so as to realize a new form of space diversity to combat the detrimental effects of fading channels. In this paper, we consider the application of these technologies to spectrum sensing and spectrum sharing. One of the most important challenges for cognitive radio systems is to identify the presence of primary (licensed) users over a wide range of spectrum at a particular time and specific geographic location. We consider the use of cooperative spectrum sensing in cognitive radio systems to enhance the reliability of detecting primary users. We shall describe spectrum sensing for cognitive radios and propose robust cooperative spectrum sensing techniques for a practical framework employing cognitive radios. We also investigate cooperative communications for spectrum sharing in a cognitive wireless relay network. To exploit the maximum spectrum opportunities, we present a cognitive spacetimefrequency coding technique that can opportunistically adjust its coding structure by adapting itself to the dynamic spectrum environment.

Original languageEnglish
Article number4895282
Pages (from-to)878-893
Number of pages16
JournalProceedings of the IEEE
Volume97
Issue number5
DOIs
Publication statusPublished - May 2009
Externally publishedYes

Fingerprint

Cooperative communication
Cognitive radio
Radio systems
Fading channels
Wireless networks
Signal processing
Communication

Keywords

  • Cognitive radio
  • Cooperative communications
  • Spectrum sensing
  • Spectrum sharing

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Cooperative communications for cognitive radio networks. / Letaief, Khaled; Zhang, Wei.

In: Proceedings of the IEEE, Vol. 97, No. 5, 4895282, 05.2009, p. 878-893.

Research output: Contribution to journalArticle

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