arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2006.13657cs.ITeess.SPmath.IT
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无人机辅助异构网络的非正交多址接入:一种随机几何模型

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

Cunzhuo Zhao, Yuanwei Liu, Yunlong Cai, Minjian Zhao, Zhiguo Ding

摘要:

在这项工作中,我们探讨了部署无人机(UAV)作为空中基站(ABS)与子6 GHz频段和小小区地面基站(TBS)与毫米波(mmWave)波段的混合异构网络(HetNets)的潜在好处。提出了一种灵活的基于非正交多址接入(NOMA)的用户关联策略。利用随机几何的工具,推导了真实空对地(A2 G)信道和地对地(G2 G)信道条件下,基于LoS球阻塞模型的关联概率、覆盖概率和频谱效率的解析表达式.最后,我们提出的混合HetNet的数值结果的见解。我们证实:i)通过适当地设置功率分配因子和目标信号干扰噪声比(SINR)阈值,所提出的NOMA使能的HetNet能够实现比OMA使能的ABS更优越的性能; ii)在NOMA使能的ABS层中存在关联概率和频谱效率之间的折衷; iii)启用NOMA的ABS层的覆盖概率和频谱效率在很大程度上受不完美连续干扰消除(ipSIC)系数、功率分配因子和SINR阈值的影响; iv)与仅低于6 GHz的ABS相比,当毫米波视线(LoS)链路可用时,毫米波使能的TBS能够增强HetNet的频谱效率。

英文摘要:

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.

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