Empirical Low-Altitude Air-to-Ground Spatial Channel Characterization for Cellular Networks Connectivity

Xuesong Cai, Tomasz Stanislaw Izydorczyk, José Rodríguez-Piñeiro, István Z. Kovács, Jeroen Wigard, Fernando Menezes Leitão Tavares, Preben E. Mogensen

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Abstract

Cellular-connected unmanned aerial vehicles (UAVs) have recently attracted a surge of interests in both academia and industry. Understanding the air-to-ground (A2G) propagation channels is essential to enable reliable and/or high-throughput communications for UAVs and protect the ground user equipments (UEs). In this contribution, a recently conducted measurement campaign for the A2G channels is introduced. A uniform circular array (UCA) with 16 antenna elements was employed to collect the downlink signals of two different Long Term Evolution (LTE) networks, at the heights of 0-40m in three different, namely rural, urban and industrial scenarios. The channel impulse responses (CIRs) have been extracted from the received data, and the spatial/angular parameters of the multipath components in individual channels were estimated according to a high-resolution-parameter estimation (HRPE) principle. Based on the HRPE results, clusters of multipath components were further identified. Finally, comprehensive spatial channel characteristics were investigated in the composite and cluster levels at different heights in the three scenarios.
Original languageEnglish
JournalIEEE Journal on Selected Areas in Communications
ISSN0733-8716
Publication statusAccepted/In press - 11 Apr 2021

Keywords

  • UAV
  • Cellular networks
  • Air-to-ground
  • Spatial channels
  • Angular characteristics
  • Clusters

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