| 1. |
- Santos, Telmo, et al.
(author)
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Modeling the ultra-wideband outdoor channel - measurements and parameter extraction method
- 2010
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In: IEEE Transactions on Wireless Communications. - 1536-1276. ; 9:1, s. 282-290
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Journal article (peer-reviewed)abstract
- This paper presents results from one of the few existing outdoor measurement campaigns for UWB. We specifically focus on scenarios applicable for "infostations," where large amounts of data can be downloaded to a user within a limited amount of time. We describe the measurement setup, and present a novel high-resolution algorithm that allows the extraction of the scatterer's positions. Measurement data is extracted using eight meter uniform linear virtual array where incoming front waves are spherical, and thus allowing for high-precision location of the scatterers. Insight is given on how these components can be tracked in the impulse response for a spatially varying terminal. We then cluster the detected components, and investigate how the angular power variations of a given scatterer are correlated with the power variations of the other scatterers belonging to the same cluster. This results in the definition of the clusters' angular radiation pattern. Further sample measurements show how obstacles obstruct the line-of-sight component; a phenomenon that we describe mathematically by "shadowing regions," and compare these measurements with the theoretical results predicted by diffraction theory.
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| 2. |
- Santos, Telmo, et al.
(author)
-
Modeling the Ultra-Wideband Outdoor Channel - Model Specification and Validation
- 2010
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In: IEEE Transactions on Wireless Communications. - 1536-1276. ; 9:6, s. 1987-1997
-
Journal article (peer-reviewed)abstract
- In this paper we establish a geometry-based stochastic ultra-wideband channel model for outdoor infostations scenarios. We statistically describe the location and strength of clusters of scatterers, as well as the shape and width of visibility and shadowing regions. We also separately model diffuse radiation (which cannot be explained by the scatterer components), and show that its fading statistics can be best described by a Weibull distribution with a delay dependent beta-parameter. A step-by-step implementation recipe demonstrates that the overall model can be implemented with little programming effort. Finally, we validate our model comparing with secondary channel parameters as rms delay spread, and show that the model can accurately describe the measured channel properties having a general applicability for these class of scenarios.
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