论文标题
无用的异质网络的非正交多访问：随机几何模型
Non-Orthogonal Multiple Access for UAV-Aided Heterogeneous Networks: A Stochastic Geometry Model
论文作者
论文摘要
在这项工作中，我们探讨了将无人驾驶飞机（UAV）作为空中基站（ABS）的潜在好处，该底座（ABS）用近6GHz带和小型牢房陆层基站（TBSS）和毫米波（MMWave）带有混合异质网络（HETNETS）。提出了基于灵活的非正交多访问（NOMA）的用户协会策略。通过使用随机几何学的工具，得出了针对关联概率，覆盖概率和光谱效率的新分析表达式，以表征使用LOS球阻滞模型在逼真的空对地面（A2G）通道和接地到地面（G2G）频道下在现实的空对地面（A2G）频道（G2G）频道下的性能。最后，我们通过数值结果提供了有关提出的混合动力HETNET的见解。我们确认I）提出的启用的NOMA能够通过设置功率分配因子和有针对性的信噪比加噪声比（SINR）阈值来实现较高的性能。 ii）关联概率与启用NOMA的频谱效率之间存在权衡； iii）启用NOMA的ABS的覆盖率概率和光谱效率在很大程度上受到不完善的连续干扰取消（IPSIC）系数，功率分配因子和SINR阈值的影响； iv）与仅SUB-6GHz ABS相比，启用MMWave的TBS能够提高HETNET的频谱效率时，当有MMWave的视线线（LOS）链接可用。
In this work, we explore the potential benefits of deploying unmanned aerial vehicles (UAVs) as aerial base stations (ABSs) with sub-6GHz band and small cells terrestrial base stations (TBSs) with millimeter wave (mmWave) band in a hybrid heterogeneous networks (HetNets). A flexible non-orthogonal multiple access (NOMA) based user association policy is proposed. By using the tools from stochastic geometry, new analytical expressions for association probability, coverage probability and spectrum efficiency are derived for characterizing the performance of UAV-aided HetNets under the realistic Air-to-Ground (A2G) channels and the Ground-to-Ground (G2G) channels with a LoS ball blockage model. Finally, we provide insights on the proposed hybrid HetNets by numerical results. We confirm that i) the proposed NOMA enabled HetNets is capable of achieving superior performance compared with the OMA enabled ABSs by setting power allocation factors and targeted signal-to-interference-plus-noise ratio (SINR) threshold properly; ii) there is a tradeoff between the association probabilities and the spectrum efficiency in the NOMA enabled ABSs tier; iii) the coverage probability and spectrum efficiency of the NOMA enabled ABSs tier is largely affected by the imperfect successive interference cancellation (ipSIC) coefficient, power allocation factors and SINR threshold; iv) compared with only sub-6GHz ABSs, mmWave enabled TBSs are capable of enhancing the spectrum efficiency of the HetNets when the mmWave line-of-sight (LoS) link is available.
