Spatially consistent pathloss modeling for millimeter-wave channels in urban environments
Spatially consistent pathloss modeling for millimeter-wave channels in urban environments
复制标题
城市环境中毫米波信道的空间一致路径损耗建模
DOI：
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复制
发表时间：
2016
期刊：
影响因子：
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通讯作者：
Jianzhong Zhang
中科院分区：
文献类型：
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作者：
A. Molisch;A. Karttunen;Sooyoung Hur;Jeongho Park;Jianzhong Zhang
本文考虑了城市环境中路径损耗建模的一个基本问题，即移动台(MS)在街道峡谷中沿轨迹移动时模型的空间一致性。我们表明，传统的幂定律路径损耗加上对数正态分布变量的模型可能会提供误导性的结果，这可能会对系统仿真产生严重影响。相反，路径损耗系数必须被建模为随街道变化的随机变量，并且也是街道方向的函数。因此，在整个单元(或多个单元)的集合上采用的通道增益的变化由这些路径损耗系数变化和沿运动轨迹的传统阴影变化的复合效应组成。光线跟踪结果表明，忽略这一影响可能导致对阴影标准差的严重高估。虽然这种影响与“基于下降”的模拟无关，但它可以对需要大规模运动的空间一致性的系统模拟产生关键影响，例如大多数毫米波系统。
This paper consider a fundamental issue of pathloss modeling in urban environments, namely the spatial consistency of the model as the mobile station (MS) moves along a trajectory through street canyons. We show that the traditional model of power law pathloss plus lognormally distributed variations can provide misleading results that can have serious implications for system simulations. Rather, the pathloss coefficient has to be modeled as a random variable that changes from street to street, and is also a function of the street orientation. Variations of the channel gain, taken over the ensemble of the whole cell (or multiple cells) thus consist of the compound effect of these pathloss coefficient variations together with traditional shadowing variations along the trajectory of movement. Ray tracing results demonstrate that ignoring this effect can lead to a severe overestimation of shadowing standard deviation. While the effect is irrelevant for “drop-based” simulations, it can have critical impact on system simulations that require spatial consistency for large-scale movement, such as most mm-wave systems.