28GHz Rural Close-to-Ground Propagation Field Test Results and Models
28GHz Rural Close-to-Ground Propagation Field Test Results and Models
复制标题
28GHz 农村近地传播现场测试结果和模型
DOI：
10.1109/ojap.2024.3370968
复制
发表时间：
2024
影响因子：
4
通讯作者：
Joseph S
中科院分区：
文献类型：
--
作者：
Joseph S
在阿伯里斯特威斯的国家频谱中心对不同的农村户外场景进行了一组28 GHz近地面传播测量。测量系统采用了基于相关性的信道探测器和喇叭天线。这些测量提供了大规模的路径损耗，时域脉冲和信道测量，这将有利于农村未来的毫米波通信系统。不同的场景，如直线和高架道路，曲折的道路和弯曲的道路在树林中探索和对数正态模型提取。还进行了不同地形（包括丘陵、草地、密林和建筑物）中的传播测量。从频率和距离两个方面研究了现有的树叶损耗模型，如Weissberger，ITU-R，COST和FITU-R的路径损耗预测。然后，测量的路径损耗与这些模型进行比较。这些模型的预测路径损耗值被高估，在28 GHz的茂密的树林后50米。在log（d）距离为1.6和1.9的建筑物中的传播中观察到强反射。在通过茂密的森林和树林中的弯曲道路的传播中观察到类似的路径损耗衰减和固定的偏移值（比自由空间多近22 dB）。所提出的近地面传播研究对于未来的军事应用和移动的设备到设备通信具有重要意义。
A set of 28 GHz close-to-ground propagation measurements are conducted for different rural outdoor scenarios at the National Spectrum Centre, Aberystwyth. A bespoke correlation based channel sounder and horn antennas are employed in the measurement system. The measurements provide large-scale path loss, time domain impulses and channel measurements that will be beneficial for rural future millimeter wave communication systems. Different scenarios, such as straight and elevated paths, zig-zag curved road and curved road in woods are explored and log-normal models are extracted. Propagation measurements in diverse terrains including hill, grass land, dense forest and buildings are also conducted. The path loss predictions of existing foliage loss models like Weissberger, ITU-R, COST and FITU-R are investigated with frequency and distance. Then, the measured path losses are compared with these models. Predicted pathloss values of these models are overestimated at 28 GHz in dense tree forest after 50 m. Strong reflections are observed in the propagation through buildings at log(d) distance of 1.6 and 1.9. Similar path loss attenuations and fixed offset values (nearly 22 dB more than free space) are observed in the propagation through the dense forest and curved road in woods. The presented close-to-ground propagation research is significant for future military applications and mobile device-to-device communications.