A Unified Framework for the Ergodic Capacity of Spectrum Sharing Cognitive Radio Systems

Handle URI:
http://hdl.handle.net/10754/263774
Title:
A Unified Framework for the Ergodic Capacity of Spectrum Sharing Cognitive Radio Systems
Authors:
Sboui, Lokman ( 0000-0003-1134-4055 ) ; Alouini, Mohamed-Slim ( 0000-0003-4827-1793 ) ; Rezki, Zouheir
Abstract:
We consider a spectrum sharing communication scenario in which a primary and a secondary users are communicating, simultaneously, with their respective destinations using the same frequency carrier. Both optimal power profile and ergodic capacity are derived for fading channels, under an average transmit power and an instantaneous interference outage constraints. Unlike previous studies, we assume that the secondary user has a noisy version of the cross link and the secondary link Channel State Information (CSI). After deriving the capacity in this case, we provide an ergodic capacity generalization, through a unified expression, that encompasses several previously studied spectrum sharing settings. In addition, we provide an asymptotic capacity analysis at high and low signal-to-noise ratio (SNR). Numerical results, applied for independent Rayleigh fading channels, show that at low SNR regime, only the secondary channel estimation matters with no effect of the cross link on the capacity; whereas at high SNR regime, the capacity is rather driven by the cross link CSI. Furthermore, a practical on-off power allocation scheme is proposed and is shown, through numerical results, to achieve the full capacity at high and low SNR regimes and suboptimal rates in the medium SNR regime.
KAUST Department:
Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division; Communication Theory Lab
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
IEEE Transactions on Wireless Communications
Issue Date:
29-Dec-2012
DOI:
10.1109/TWC.2012.122212.120449
ARXIV:
arXiv:1211.6566
Type:
Article
Description:
This paper has been accepted in IEEE Transactions on Wireless Communications.
ISSN:
1536-1276
Additional Links:
http://arxiv.org/abs/1211.6566
Appears in Collections:
Articles; Communication Theory Lab; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorSboui, Lokmanen
dc.contributor.authorAlouini, Mohamed-Slimen
dc.contributor.authorRezki, Zouheiren
dc.date.accessioned2012-12-29T11:36:21Z-
dc.date.available2012-12-29T11:36:21Z-
dc.date.issued2012-12-29en
dc.identifier.issn1536-1276en
dc.identifier.doi10.1109/TWC.2012.122212.120449en
dc.identifier.urihttp://hdl.handle.net/10754/263774en
dc.descriptionThis paper has been accepted in IEEE Transactions on Wireless Communications.en
dc.description.abstractWe consider a spectrum sharing communication scenario in which a primary and a secondary users are communicating, simultaneously, with their respective destinations using the same frequency carrier. Both optimal power profile and ergodic capacity are derived for fading channels, under an average transmit power and an instantaneous interference outage constraints. Unlike previous studies, we assume that the secondary user has a noisy version of the cross link and the secondary link Channel State Information (CSI). After deriving the capacity in this case, we provide an ergodic capacity generalization, through a unified expression, that encompasses several previously studied spectrum sharing settings. In addition, we provide an asymptotic capacity analysis at high and low signal-to-noise ratio (SNR). Numerical results, applied for independent Rayleigh fading channels, show that at low SNR regime, only the secondary channel estimation matters with no effect of the cross link on the capacity; whereas at high SNR regime, the capacity is rather driven by the cross link CSI. Furthermore, a practical on-off power allocation scheme is proposed and is shown, through numerical results, to achieve the full capacity at high and low SNR regimes and suboptimal rates in the medium SNR regime.en
dc.language.isoenen
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.relation.urlhttp://arxiv.org/abs/1211.6566en
dc.subjectUnderlay cognitive radioen
dc.subjectSpectrum sharingen
dc.subjectErgodic capacityen
dc.subjectImperfect CSIen
dc.subjectOn-off schemeen
dc.titleA Unified Framework for the Ergodic Capacity of Spectrum Sharing Cognitive Radio Systemsen
dc.typeArticleen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.contributor.departmentCommunication Theory Laben
dc.identifier.journalIEEE Transactions on Wireless Communicationsen
dc.eprint.versionPre-printen
dc.contributor.institutionElectronics and Communication Department, Faculty of Engineering, Cairo University, Cairo, Egypten
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
dc.identifier.arxividarXiv:1211.6566en
kaust.authorSboui, Lokmanen
kaust.authorRezki, Zouheiren
kaust.authorAlouini, Mohamed-Slimen
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