Impact of Rough Surface Scattering on Stochastic Multipath Component Models

Abstract

Multipath-assisted positioning makes use of specular multipath components (MPCs), whose parameters are geometrically related to the positions of the transceiver nodes. Diffuse scattering from rough surfaces affects the observed specular reflections in the angular and delay domains. Based on the effective roughness approach, the angular delay power spectrum can be calculated as a function of location parameters, which-in a next step-could be useful to accurately characterize the position-related information of MPCs. The calculated power spectra follow reported characteristics of stochastic multipath models, i.e. Gaussian shape in the angular domain and an exponential shape in the delay domain. The resulting angular and delay spreads are in an equivalent range to values reported in literature.

5G Positioning and Mapping With Diffuse Multipath

“…We propose a generative model for simulating the diffuse multipath of mmWave channels, based on [30], [31]. This model starts from generating points on the surface, based on the its roughness.…”

“…1) Surface Roughness and Scattering: The propagation environment consists of K well-separated clusters, each cluster k corresponds to a physical object (e.g., a wall, a ground reflection), described by MPCs, characterized by two parameters [30], [31]:…”

“…, 11} [31], [32]. Combined, α R and S can be used to determine the cluster power and cluster spread through the joint angular delay power spectrum (JADPS) which describes the scattered power p DM (p) from any point p [30]. Cluster k gives rise to L k scatter points, where the total number of paths is P = K k=1 L k .…”

“…Clearly, p DM (p) = 0 for any p not lying on a surface. To populate the k-th rough surface S k with scatter points {p kl } ⊆ S k , 0 < l ≤ L k , we decompose p DM (p) = k p DM,k (p) where p DM,k (p) denotes the JADPS associated to k. The JADPS is calculated as function of p T , p R , surface location, as well as S and α R [30].…”

A survey on 5G massive MIMO localization

“…It becomes quite complicated and challenging, if both the nominal parameter and deviation are parameters of interest. Attempts have been made for a stochastic description of the dense multipaths [25,26].…”