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Capacity Considerations for Uncoordinated Communication in Geographical Spectrum Holes
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.ORCID iD: 0000-0002-7599-4367
Linköping University, Department of Electrical Engineering, Communication Systems. Linköping University, The Institute of Technology.
2009 (English)In: Physical Communication, ISSN 1874-4907, Vol. 2, no 1-2, 3-9 p.Article in journal (Refereed) Published
Abstract [en]

Cognitive radio is a new concept of reusing a licensed spectrum in an unlicensed manner. The motivation for cognitive radio is various measurements of spectrum utilization, that generally show unused resources in frequency, time and space. These "spectrum holes" could be exploited by cognitive radios. Some studies suggest that the spectrum is extremely underutilized, and that these spectrum holes could provide ten times the capacity of all existing wireless devices together. The spectrum could be reused either during time periods where the primary system is not active, or in geographical positions where the primary system is not operating. In this paper, we deal primarily with the concept of geographical reuse, in a frequency-planned primary network. We perform an analysis of the potential for communication in a geographical spectrum hole, and in particular the achievable sum-rate for a secondary network, to some order of magnitude. Simulation results show that a substantial sum-rate could be achieved if the secondary users communicate over small distances. For a small number of secondary links, the sum-rate increases linearly with the number of links. However, the spectrum hole gets saturated quite fast, due to interference caused by the secondary users. A spectrum hole may look large, but it disappears as soon as someone starts using it.

Place, publisher, year, edition, pages
Elsevier , 2009. Vol. 2, no 1-2, 3-9 p.
Keyword [en]
achievable rate, capacity, cognitive radio, spectrum hole
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:liu:diva-21547DOI: 10.1016/j.phycom.2009.03.002OAI: oai:DiVA.org:liu-21547DiVA: diva2:241500
Note
Original Publication: Erik Axell, Erik G. Larsson and Danyo Danev, Capacity Considerations for Uncoordinated Communication in Geographical Spectrum Holes, 2009, Physical Communication, (2), 1-2, 3-9. http://dx.doi.org/10.1016/j.phycom.2009.03.002 Copyright: Elsevier Science B.V., Amsterdam http://www.elsevier.com/ Available from: 2009-10-03 Created: 2009-10-02 Last updated: 2016-08-31Bibliographically approved
In thesis
1. Topics in Spectrum Sensing for Cognitive Radio
Open this publication in new window or tab >>Topics in Spectrum Sensing for Cognitive Radio
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

Cognitive radio is a new concept of reusing licensed spectrum in an unlicensed manner. Cognitive radio is motivated by recent measurements of spectrum utilization, showing unused resources in frequency, time and space. The spectrum must be sensed to detect primary user signals, in order to allow cognitive radios in a primary system. In this thesis we study some topics in spectrum sensing for cognitive radio.

The fundamental problem of spectrum sensing is to discriminate samples that contain only noise from samples that contain a very weak signal embedded in noise. We derive detectors that exploit known structures of the signal, for the cases of an OFDM modulated signal and an orthogonal space-time block coded signal. We derive optimal detectors, in the Neyman-Pearson sense, for a few different cases when all parameters are known. Moreover we study detection when the parameters, such as noise variance, are unknown. We propose solutions the problem of unknown parameters.

We also study system aspects of cognitive radio. More specifically, we investigate spectrum reuse of geographical spectrum holes in a frequency planned primary network. System performance is measured in terms of the achievable rate for the cognitive radio system. Simulation results show that a substantial sum-rate could be achieved if the cognitive radios communicate over small distances. However, the spectrum hole gets saturated quite fast, due to interference caused by the cognitive radios.

Place, publisher, year, edition, pages
Linköping: Linköping University Electronic Press, 2009. 21 p.
Series
Linköping Studies in Science and Technology. Thesis, ISSN 0280-7971 ; 1417
National Category
Engineering and Technology
Identifiers
urn:nbn:se:liu:diva-51748 (URN)978-91-7393-523-4 (ISBN)
Presentation
2009-12-21, Glashuset, Campus Valla, Linköpings universitet, Linköping, 13:15 (English)
Opponent
Supervisors
Available from: 2009-11-20 Created: 2009-11-17 Last updated: 2017-01-13Bibliographically approved

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Axell, ErikLarsson, Erik G.Danev, Danyo

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