The ultra-wide bandwidth indoor channel: from statistical model to simulations

TLDR

The study establishes a statistical model for the UWB indoor channel from extensive measurements and proposes an implementation of the model with simulation comparisons. The model is derived by analyzing multipath statistics from a finely spaced measurement grid in various rooms and is implemented as a stochastic tapped-delay-line for simulation. The analysis yields a stochastic tapped-delay-line model whose power delay profile follows an exponential decay, path gains are Gamma‑distributed, total energy shows lognormal shadowing, multipath correlation is negligible, and simulations agree with measurements.

Abstract

We establish a statistical model for the ultra-wide bandwidth (UWB) indoor channel based on an extensive measurement campaign in a typical modern office building with 2-ns delay resolution. The approach is based on the investigation of the statistical properties of the multipath profiles measured in different rooms over a finely spaced measurement grid. The analysis leads to the formulation of a stochastic tapped-delay-line (STDL) model of the UWB indoor channel. The averaged power delay profile can be well-modeled by a single exponential decay with a statistically distributed decay constant. The small-scale statistics of path energy gains follow Gamma distributions whose parameters m are truncated Gaussian variables with mean values and standard deviations decreasing with delay. The total received energy experiences a lognormal shadowing around the mean energy given by the path-loss power law. We also find that the correlation between multipath components is negligible. Finally, we propose an implementation of the STDL model and give a comparison between the experimental data and the simulation results.