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dc.contributor.authorHossain, Md Jahangir
dc.contributor.authorAlouini, Mohamed-Slim
dc.contributor.authorBhargava, Vijay K.
dc.date.accessioned2015-08-02T09:11:52Z
dc.date.available2015-08-02T09:11:52Z
dc.date.issued2010-03
dc.identifier.issn00906778
dc.identifier.doi10.1109/TCOMM.2010.03.080238
dc.identifier.urihttp://hdl.handle.net/10754/561457
dc.description.abstractOur contribution, in this paper, is two-fold. First, we analyze the performance of a hierarchical modulation-assisted two-best user opportunistic scheduling (TBS) scheme, which was proposed by the authors, in a fading environment where different users have different average link gains. Specifically, we present a new expression for the spectral efficiency (SE) of the users and using this expression, we compare the degrees of fairness (DOF) of the TBS scheme with that of classical single user opportunistic scheduling schemes, namely, absolute carrier-to-noise ratio (CNR) based single-best user scheduling (SBS) and normalized CNR based proportional fair scheduling (PFS) schemes. The second contribution is that we propose a new hybrid two-user opportunistic scheduling (HTS) scheme based on our earlier proposed TBS scheme. This HTS scheme selects the first user based on the largest absolute CNR value among all the users while the second user is selected based on the ratios of the absolute CNRs to the corresponding average CNRs of the remaining users. The total transmission rate i.e., the constellation size is selected according to the absolute CNR of the first best user. The total transmission rate is then allocated among these selected users by joint consideration of their absolute CNRs and allocated number of information bit(s) are transmitted to them using hierarchical modulations. Numerical results are presented for a fading environment where different users experience independent but non-identical (i.n.d.) channel fading. These selected numerical results show that the proposed HTS scheme can considerably increase the system's fairness without any degradation of the link spectral efficiency (LSE) i.e., the multiuser diversity gain compared to the classical SBS scheme. These results also show that the proposed HTS scheme has a lower fairness in comparison to the PFS scheme which suffers from a considerable degradation in LSE. © 2010 IEEE.
dc.description.sponsorshipThis work, in part, has been presented in the IEEE International Conference on Communication (ICC'08), Beijing, China. It is supported in part by the Li Tze Fong Memorial Fellowship; in part by the Natural Sciences and Engineering Council of Canada (NSERC) Canada; and in part by the Qatar foundation for Education, Science, and Community development.
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)
dc.subjectAdaptive modulations
dc.subjectAnd degrees of fairness
dc.subjectHierarchical constellations
dc.subjectMultiuser diversity
dc.subjectOpportunistic scheduling
dc.subjectSpectral efficiency
dc.titleTwo-user opportunistic scheduling using hierarchical modulations in wireless networks with heterogenous average link gains
dc.typeArticle
dc.contributor.departmentCommunication Theory Lab
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalIEEE Transactions on Communications
dc.contributor.institutionInstitut National de la Recherche Scientifique, INRS-EMT, 800, Gauchetiere W., Montreal H5A 1K6, Canada
dc.contributor.institutionDepartment of Electrical and Computer Engineering, University of British Columbia, Vancouver, Canada
kaust.personAlouini, Mohamed-Slim


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