Robust distributed two-way relay beamforming in cognitive radio networks

Handle URI:
http://hdl.handle.net/10754/564534
Title:
Robust distributed two-way relay beamforming in cognitive radio networks
Authors:
Pandarakkottilil, Ubaidulla; Aissa, Sonia
Abstract:
In this paper, we present distributed beamformer designs for a cognitive radio network (CRN) consisting of a pair of cognitive (or secondary) transceiver nodes communicating with each other through a set of secondary non-regenerative two-way relays. The secondary network shares the spectrum with a licensed primary user (PU), and operates under a constraint on the maximum interference to the PU, in addition to its own resource and quality of service (QoS) constraints. We propose beamformer designs assuming that the available channel state information (CSI) is imperfect, which reflects realistic scenarios. The performance of proposed designs is robust to the CSI errors. Such robustness is critical in CRNs given the difficulty in acquiring perfect CSI due to loose cooperation between the PUs and the secondary users (SUs), and the need for strict enforcement of PU interference limit. We consider a mean-square error (MSE)-constrained beamformer that minimizes the total relay transmit power and an MSE-balancing beamformer with a constraint on the total relay transmit power. We show that the proposed designs can be reformulated as convex optimization problems that can be solved efficiently. Through numerical simulations, we illustrate the improved performance of the proposed robust designs compared to non-robust designs. © 2012 IEEE.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Publisher:
Institute of Electrical and Electronics Engineers (IEEE)
Journal:
2012 19th International Conference on Telecommunications (ICT)
Conference/Event name:
2012 19th International Conference on Telecommunications, ICT 2012
Issue Date:
Apr-2012
DOI:
10.1109/ICTEL.2012.6221248
Type:
Conference Paper
ISBN:
9781467307475
Appears in Collections:
Conference Papers; Physical Sciences and Engineering (PSE) Division; Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorPandarakkottilil, Ubaidullaen
dc.contributor.authorAissa, Soniaen
dc.date.accessioned2015-08-04T07:03:26Zen
dc.date.available2015-08-04T07:03:26Zen
dc.date.issued2012-04en
dc.identifier.isbn9781467307475en
dc.identifier.doi10.1109/ICTEL.2012.6221248en
dc.identifier.urihttp://hdl.handle.net/10754/564534en
dc.description.abstractIn this paper, we present distributed beamformer designs for a cognitive radio network (CRN) consisting of a pair of cognitive (or secondary) transceiver nodes communicating with each other through a set of secondary non-regenerative two-way relays. The secondary network shares the spectrum with a licensed primary user (PU), and operates under a constraint on the maximum interference to the PU, in addition to its own resource and quality of service (QoS) constraints. We propose beamformer designs assuming that the available channel state information (CSI) is imperfect, which reflects realistic scenarios. The performance of proposed designs is robust to the CSI errors. Such robustness is critical in CRNs given the difficulty in acquiring perfect CSI due to loose cooperation between the PUs and the secondary users (SUs), and the need for strict enforcement of PU interference limit. We consider a mean-square error (MSE)-constrained beamformer that minimizes the total relay transmit power and an MSE-balancing beamformer with a constraint on the total relay transmit power. We show that the proposed designs can be reformulated as convex optimization problems that can be solved efficiently. Through numerical simulations, we illustrate the improved performance of the proposed robust designs compared to non-robust designs. © 2012 IEEE.en
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)en
dc.titleRobust distributed two-way relay beamforming in cognitive radio networksen
dc.typeConference Paperen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Divisionen
dc.identifier.journal2012 19th International Conference on Telecommunications (ICT)en
dc.conference.date23 April 2012 through 25 April 2012en
dc.conference.name2012 19th International Conference on Telecommunications, ICT 2012en
dc.conference.locationJouniehen
dc.contributor.institutionINRS, University of Quebec, Montreal, QC, Canadaen
kaust.authorPandarakkottilil, Ubaidullaen
kaust.authorAissa, Soniaen
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