AERIQ：基于SDR的空地传播建模LTE I/Q测量与分析框架
AERIQ: SDR-Based LTE I/Q Measurement and Analysis Framework for Air-to-Ground Propagation Modeling
摘要：
在本文中，我们介绍了AERIQ：一个基于软件定义无线电（SDR）的I/Q测量和分析框架的无线信号的空中实验。AERIQ集成到可控飞行器中，它灵活，可重复，并提供原始I/Q样本用于后处理数据，以提取3D体积上的各种关键参数（KPI）。使用SDR，我们从我们配置为在3.51 GHz下操作的4G LTE eNB收集在无线电动态区（RDZ）等室外环境中以各种高度飞行的无人机（UAV）的I/Q数据。使用原始I/Q样本，并使用Matlab的LTE时钟，我们提供了一个逐步的描述频率偏移估计/校正，同步，小区搜索，信道估计，和参考信号接收功率（RSRP）。我们为每个步骤提供了各种代表性的结果，如RSRP测量和相应的解析近似在不同的无人机高度，相干带宽和相干时间的信道在不同的无人机高度和链路距离，和克里金基于3D RSRP插值。所收集的原始数据以及为获取和后处理这些数据而开发的软件都是公开提供的，供其他研究人员使用。AERIQ还可用于仿真和测试平台环境，供外部研究人员访问和使用，作为北卡罗来纳州立大学NSF AERPAW平台的一部分。
英文摘要：
In this paper, we introduce AERIQ: a software-defined radio (SDR) based I/Q measurement and analysis framework for wireless signals for aerial experimentation. AERIQ is integrated into controllable aerial vehicles, it is flexible, repeatable, and provides raw I/Q samples for post-processing the data to extract various key parameters of interest (KPIs) over a 3D volume. Using SDRs, we collect I/Q data with unmanned aerial vehicles (UAVs) flying at various altitudes in a radio dynamic zone (RDZ) like outdoor environment, from a 4G LTE eNB that we configure to operate at 3.51 GHz. Using the raw I/Q samples, and using Matlab's LTE Toolbox, we provide a step-by-step description for frequency offset estimation/correction, synchronization, cell search, channel estimation, and reference signal received power (RSRP). We provide various representative results for each step, such as RSRP measurements and corresponding analytical approximation at different UAV altitudes, coherence bandwidth and coherence time of the channel at different UAV altitudes and link distances, and kriging based 3D RSRP interpolation. The collected raw data as well as the software developed for obtaining and post-processing such data are provided publicly for potential use by other researchers. AERIQ is also available in emulation and testbed environments for external researchers to access and use as part of the NSF AERPAW platform at NC State University.
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