This letter investigates propagation at 7 and 13 GHz in urban locations motivated by coexistence studies in the recently opened 6 GHz band (5925-7125 MHz) and in the similar 13 GHz band (12700-13250 MHz). Path loss measurements were collected in four urban areas in both line-of-sight (LOS) and non-LOS (NLOS) conditions. We derive floating-intercept (FI) and close-in free space reference distance (CI) path loss models and achieve RMS errors between 5.6 and 9.0 dB. We investigate the applicability of WINNER II and 3GPP models at these frequencies and find that the LOS case provides a conservative estimate of propagation loss.

中文翻译：

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城市环境中 7GHz 和 13GHz 频谱共享的传播模型分析

这封信调查了在最近开放的 6 GHz 频段 (5925-7125 MHz) 和类似的 13 GHz 频段 (12700-13250 MHz) 共存研究的推动下，城市地区 7 和 13 GHz 的传播。在视距 (LOS) 和非视距 (NLOS) 条件下，在四个城市地区收集了路径损耗测量值。我们推导出浮动截距 (FI) 和近距离自由空间参考距离 (CI) 路径损耗模型，并实现 5.6 到 9.0 dB 之间的 RMS 误差。我们研究了 WINNER II 和 3GPP 模型在这些频率下的适用性，发现 LOS 案例提供了传播损耗的保守估计。