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arXiv 2108.11902eess.SP
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UAV空对地时变信道的参数化与建模

Cluster-based Characterization and Modeling for UAV Air-to-Ground Time-Varying Channels

Zhuangzhuang Cui, Ke Guan, Claude Oestges, César Briso-Rodríguez, Bo Ai, Zhangdui Zhong

摘要:

随着无人机(UAV)与无线通信的深度融合,对基于无人机的空-地(AG)传播信道需要更加详细的描述和精确的模型。在本文中,我们的目标是进行基于集群的表征和建模AG通道。据我们所知,这是第一个研究,集中在聚类和跟踪的多径分量(MPC)随时间变化的AG信道。基于测量数据在6.5 GHz与500 MHz的带宽,我们首先估计潜在的MPC利用空间交替广义期望最大化(SAGE)算法。然后,我们聚类提取的MPC考虑其静态和动态特性,采用K-Power-Means(KPM)算法下的多径分量距离(MCD)的措施。为了表征时变聚类,我们采用了一种基于聚类的跟踪(CBT)方法,该方法有效地量化了聚类的生存长度。最后,我们建立了一个基于集群的渠道模型,并验证了所提出的模型的准确性。这项工作不仅促进了对AG传播信道的理解,而且提供了一个通用的基于簇的AG信道模型,具有一定的可扩展性。

英文摘要:

With the deep integration between the unmanned aerial vehicle (UAV) and wireless communication, UAV-based air-to-ground (AG) propagation channels need more detailed descriptions and accurate models. In this paper, we aim to perform cluster-based characterization and modeling for AG channels. To our best knowledge, this is the first study that concentrates on the clustering and tracking of multipath components (MPCs) for time-varying AG channels. Based on measurement data at 6.5 GHz with 500 MHz of bandwidth, we first estimate potential MPCs utilizing the space-alternating generalized expectation-maximization (SAGE) algorithm. Then, we cluster the extracted MPCs considering their static and dynamic characteristics by employing K-Power-Means (KPM) algorithm under multipath component distance (MCD) measure. For characterizing time-variant clusters, we exploit a clustering-based tracking (CBT) method, which efficiently quantifies the survival lengths of clusters. Ultimately, we establish a cluster-based channel model, and validations illustrate the accuracy of the proposed model. This work not only promotes a better understanding of AG propagation channels but also provides a general cluster-based AG channel model with certain extensibility.

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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