arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1905.01477eess.SP
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悬停起伏下毫米波UAV网络的信道解析模型

Analytical Channel Models for Millimeter Wave UAV Networks under Hovering Fluctuations

Mohammad Taghi Dabiri, Hossein Safi, Saeedeh Parsaeefard, Walid Saad

摘要:

最近已经提出了无人机(UAV)和毫米波(mmWave)无线系统的集成,以为下一代无线网络提供高数据速率空中链路。然而,建立基于无人机的毫米波链路是相当具有挑战性的,由于悬停无人机的随机波动,这可能会导致发射机和接收机之间的天线增益失配。为了评估基于无人机的毫米波链路的益处,本文针对以下三种无人机通信场景导出了易于处理的闭式统计信道模型:(i)直接的无人机到无人机链路,(ii)源、中继和目的地为悬停无人机的空中中继链路,以及(iii)悬停无人机将地面源连接到地面目的地的中继链路。通过Monte-Carlo模拟证实了推导出的解析表达式的准确性。数值结果,然后使用不同的信道条件下建立可靠的无人机为基础的毫米波链路,实现最小的中断概率的天线方向性增益的影响进行研究。结果表明,这种链路的性能在很大程度上取决于悬停无人机的随机波动。此外,较高的天线方向性增益在低SNR状况下实现较好的性能。然而,在高SNR状态下,较低的天线方向性增益导致更可靠的通信链路。因此,开发的结果可以作为一个基准,找到最佳的天线方向性增益的无人机下的不同水平的不稳定性,而不诉诸耗时的模拟。

英文摘要:

The integration of unmanned aerial vehicles (UAVs) and millimeter wave (mmWave) wireless systems has been recently proposed to provide high data rate aerial links for next generation wireless networks. However, establishing UAV-based mmWave links is quite challenging due to the random fluctuations of hovering UAVs which can induce antenna gain mismatch between transmitter and receiver. To assess the benefit of UAV-based mmWave links, in this paper, tractable, closed-form statistical channel models are derived for three UAV communication scenarios: (i) a direct UAV-to-UAV link, (ii) an aerial relay link in which source, relay, and destination are hovering UAVs, and (iii) a relay link in which a hovering UAV connects a ground source to a ground destination. The accuracy of the derived analytical expressions is corroborated by performing Monte-Carlo simulations. Numerical results are then used to study the effect of antenna directivity gain under different channel conditions for establishing reliable UAV-based mmWave links in terms of achieving minimum outage probability. It is shown that the performance of such links is largely dependent on the random fluctuations of hovering UAVs. Moreover, higher antenna directivity gains achieve better performance at low SNR regime. Nevertheless, at the high SNR regime, lower antenna directivity gains result in a more reliable communication link. The developed results can therefore be applied as a benchmark for finding the optimal antenna directivity gain of UAVs under the different levels of instability without resorting to time-consuming simulations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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