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Non-Orthogonal Multiple Access for UAV-Aided Heterogeneous Networks A Stochastic Geometry Model

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Document pages: 15 pages

Abstract: In this work, we explore the potential benefits of deploying unmanned aerialvehicles (UAVs) as aerial base stations (ABSs) with sub-6GHz band and smallcells terrestrial base stations (TBSs) with millimeter wave (mmWave) band in ahybrid heterogeneous networks (HetNets). A flexible non-orthogonal multipleaccess (NOMA) based user association policy is proposed. By using the toolsfrom stochastic geometry, new analytical expressions for associationprobability, coverage probability and spectrum efficiency are derived forcharacterizing the performance of UAV-aided HetNets under the realisticAir-to-Ground (A2G) channels and the Ground-to-Ground (G2G) channels with a LoSball blockage model. Finally, we provide insights on the proposed hybridHetNets by numerical results. We confirm that i) the proposed NOMA enabledHetNets is capable of achieving superior performance compared with the OMAenabled ABSs by setting power allocation factors and targetedsignal-to-interference-plus-noise ratio (SINR) threshold properly; ii) there isa tradeoff between the association probabilities and the spectrum efficiency inthe NOMA enabled ABSs tier; iii) the coverage probability and spectrumefficiency of the NOMA enabled ABSs tier is largely affected by the imperfectsuccessive interference cancellation (ipSIC) coefficient, power allocationfactors and SINR threshold; iv) compared with only sub-6GHz ABSs, mmWaveenabled TBSs are capable of enhancing the spectrum efficiency of the HetNetswhen the mmWave line-of-sight (LoS) link is available.

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