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dc.contributor.authorCelik, Abdulkadir
dc.contributor.authorTsai, Ming-Cheng
dc.contributor.authorRadaydeh, Redha M.
dc.contributor.authorAl-Qahtani, Fawaz S.
dc.contributor.authorAlouini, Mohamed-Slim
dc.identifier.citationCelik A, Tsai M-C, Radaydeh RM, Al-Qahtani FS, Alouini M-S (2018) Distributed Cluster Formation and Power-Bandwidth Allocation for Imperfect NOMA in DL-HetNets. IEEE Transactions on Communications: 1–1. Available:
dc.description.abstractIn this paper, we consider an non-ideal successive interference cancellation (SIC) receiver based imperfect nonorthogonal multiple access (NOMA) schemes whose performance is limited by three factors: 1) Power disparity & sensitivity constraints (PDSCs), 2) Intra-cluster interference (ICRI), and 3) Intercell-interference (ICI). By quantifying the residual interference with a fractional error factor (FEF), we show that NOMA cannot always perform better than orthogonal multiple access (OMA) especially under certain receiver sensitivity and FEF levels. Assuming the existence of an offline/online ICI management scheme, the proposed solution accounts for the ICI which is shown to deteriorate the NOMA performance particularly when it becomes significant compared to the ICRI. Then, a distributed cluster formation (CF) and power-bandwidth allocation (PBA) approach are proposed for downlink (DL) heterogeneous networks (HetNets) operating on the imperfect NOMA. We develop a hierarchically distributed solution methodology where BSs independently form clusters and distributively determine the power-bandwidth allowance of each cluster. A generic CF scheme is obtained by creating a multi-partite graph (MPG) via partitioning user equipments (UEs) with respect to their channel gains since NOMA performance is primarily determined by the channel gain disparity of cluster members. A sequential weighted bi-partite matching method is proposed for solving the resulted weighted multi-partite matching problem. Thereafter, we present a hierarchically distributed PBA approach which consists of the primary master, secondary masters, and slave problems. For a given cluster power and bandwidth pair, optimal power allocations and Lagrange multipliers of slave problems are derived in closed-form. While power allowance of clusters is updated by the secondary masters based on dual variables of slave problems, bandwidth proportions of clusters are iteratively allocated by the primary master as per the utility achieved by the secondary masters at the previous iteration. Finally, the proposed CF and PBA approaches under the operation of imperfect NOMA are investigated and compared to the OMA scheme by extensive simulations results in DL-HetNets.
dc.description.sponsorshipThis work was supported by NPRP from the Qatar National Research Fund under grant no. 8-1545-2-657.
dc.publisherInstitute of Electrical and Electronics Engineers (IEEE)
dc.rights(c) 2018 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.
dc.subjectImperfect SIC
dc.subjectresidual interference
dc.subjectintra-cell interference
dc.subjectinter-cell interference
dc.subjecthierarchical decomposition
dc.subjectdistributed resource allocation. multi-partite matching
dc.titleDistributed Cluster Formation and Power-Bandwidth Allocation for Imperfect NOMA in DL-HetNets
dc.contributor.departmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
dc.contributor.departmentElectrical Engineering Program
dc.identifier.journalIEEE Transactions on Communications
dc.contributor.institutionElectrical Engineering Program, Department of Engineering and Technology, Texas A& M University-Commerce, Commerce, TX, USA.
dc.contributor.institutionResearch, Development, Innovation (RDI) Division of Qatar Foundation, Doha, Qatar.
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)
kaust.personCelik, Abdulkadir
kaust.personTsai, Ming-Cheng
kaust.personAlouini, Mohamed-Slim

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