Characteristics of the NLoS Bias for an Outdoor-to-Indoor Scenario at 2.45 GHz and 5.2 GHz
Characteristics of the NLoS Bias for an Outdoor-to-Indoor Scenario at 2.45 GHz and 5.2 GHz
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2.45GHz和5.2GHz室外到室内场景NLoS Bias特性
DOI：
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发表时间：
2011
影响因子：
4.2
通讯作者：
U. Fiebig
中科院分区：
文献类型：
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作者：
Wei Wang;T. Jost;U. Fiebig
地面蜂窝移动无线电的基于时间的定位作为全球导航卫星系统的补充已引起广泛关注。然而，在非视距 (NLoS) 条件下，定位接收器的性能会因额外的偏差而降低。该 NLoS 偏差定义为第一可检测路径与几何视线之间的附加传播距离。在这封信中，我们解决了通过室外到室内场景中不同载波频率的信道测量活动获得的 NLoS 偏差。事实证明，获得的NLoS偏差在不同基站链路之间主要是不相关的。此外，我们发现 NLoS 偏差强烈依赖于场景的几何形状。在所谓的“温和”场景中，我们发现 NLoS 偏差很小并且几乎与频率无关。在我们称之为“严重”的场景中，NLoS 偏差很大并且与频率相关。此外，我们还提出了 NLoS 偏差、第一条可检测路径的归一化功率及其在 2.45 和 5.2 GHz 载波频率下的到达角的联合概率分布。此外，还评估了移动接收器的 NLoS 偏差的去相关距离。
Time-based localization by terrestrial cellular mobile radio as a complement to global navigation satellite systems has gained significant attention. However, under non-line-of-sight (NLoS) conditions, the performance of positioning receivers is degraded by an additional bias. This NLoS bias is defined as the additional propagation distance between the first detectable path and the geometric line of sight. In this letter, we address the NLoS bias as obtained by a channel measurement campaign at different carrier frequencies in an outdoor-to-indoor scenario. It turns out that the obtained NLoS bias is mainly uncorrelated between different base-station links. Furthermore, the NLoS bias is found to be strongly dependent on the geometry of the scenario. In so-called ”mild” scenarios, we found out that the NLoS bias is small and almost frequency-independent. In scenarios we call ”severe,” the NLoS bias is large and frequency-dependent. Additionally, we present the joint probability distributions of the NLoS bias, the normalized power of the first detectable path, and its angle of arrival for carrier frequencies of 2.45 and 5.2 GHz. Moreover, the decorrelation distance of the NLoS bias for a moving receiver is evaluated.