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dc.contributor.authorAbdallah, Mohamed M.
dc.contributor.authorSalem, Ahmed H.
dc.contributor.authorAlouini, Mohamed-Slim
dc.contributor.authorQaraqe, Khalid A.
dc.date.accessioned2015-08-04T06:20:44Z
dc.date.available2015-08-04T06:20:44Z
dc.date.issued2010
dc.identifier.isbn9781424459995
dc.identifier.doi10.1109/EW.2010.5483522
dc.identifier.urihttp://hdl.handle.net/10754/564251
dc.description.abstractWe consider the problem of maximizing the average spectral efficiency of a secondary link in underlay cognitive networks. In particular, we consider the network setting whereby the secondary transmitter employs discrete rate and variable power adaptation under the constraints of maximum average transmit power and maximum average interference power allowed at the primary receiver due to the existence of an interference link between the secondary transmitter and the primary receiver. We first find the optimal discrete rates assuming a predetermined partitioning of the signal-to-noise ratio (SNR) of both the secondary and interference links. We then present an iterative algorithm for finding a suboptimal partitioning of the SNR of the interference link assuming a fixed partitioning of the SNR of secondary link selected for the case where no interference link exists. Our numerical results show that the average spectral efficiency attained by using the iterative algorithm is close to that achieved by the computationally extensive exhaustive search method for the case of Rayleigh fading channels. In addition, our simulations show that selecting the optimal partitioning of the SNR of the secondary link assuming no interference link exists still achieves the maximum average spectral efficiency for the case where the average interference constraint is considered. © 2010 IEEE.
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)
dc.titleDiscrete rate and variable power adaptation for underlay cognitive networks
dc.typeConference Paper
dc.contributor.departmentCommunication Theory Lab
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Division
dc.identifier.journal2010 European Wireless Conference (EW)
dc.conference.date12 April 2010 through 15 April 2010
dc.conference.name2010 European Wireless Conference, EW 2010
dc.conference.locationLucca
dc.contributor.institutionDepartment of Electrical and Computer Engineering, Texas A and M University at Qatar, Education City, Doha, Qatar
dc.contributor.institutionDepartment of Electronics and Electrical Communication, Cairo University, Giza, Cairo, Egypt
kaust.personAlouini, Mohamed-Slim


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