期刊
IEEE TRANSACTIONS ON VEHICULAR TECHNOLOGY
卷 71, 期 7, 页码 6872-6883出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TVT.2022.3168073
关键词
Delays; Bandwidth; Clustering algorithms; Channel models; Trajectory; Autonomous aerial vehicles; Length measurement; Air-to-ground; channel measurement; channel impulse response; cluster; multipath; unmanned aerial vehicle
资金
- Fundamental Research Funds for the Central Universities [2020JBM082]
- Beijing Natural Science Foundation [L212029]
- State Key Laboratory of Rail Traffic Control and Safety [RCS2020ZZ005]
- NSFC [61901029, 61725101]
This paper focuses on the cluster-based characterization and modeling of air-to-ground (AG) propagation channels for unmanned aerial vehicles (UAVs) integrated with wireless communication. It proposes a novel cluster-based AG channel model and validates its accuracy.
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 conduct 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 a bandwidth of 500 MHz, we first estimate potential MPCs utilizing the space-alternating generalized expectation-maximization (SAGE) algorithm. Then, we cluster the extracted MPCs 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.
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