Realistic Channel and Delay Coefficient Generation for Dual Mobile Space-Ground Links - A Tutorial-

TL;DR

This paper provides a tutorial on generating realistic channel and delay coefficients for dual mobile space-ground links using QuaDRiGa and ITU models, addressing challenges of existing models and validating accuracy through multiple metrics.

Contribution

It introduces a scalable tutorial utilizing QuaDRiGa and ITU models for realistic channel simulation in space-ground links, overcoming limitations of traditional deterministic and stochastic models.

Findings

Generated channel and delay coefficients match real-world signal power and amplitude.

Delay distribution and spread align with expected multipath characteristics.

Doppler spectrum analysis confirms realistic mobility effects.

Abstract

Channel and delay coefficient are two essential parameters for the characterization of a multipath propagation environment. It is crucial to generate realistic channel and delay coefficient in order to study the channel characteristics that involves signals propagating through environments with severe multipath effects. While many deterministic channel models, such as ray-tracing (RT), face challenges like high computational complexity, data requirements for geometrical information, and inapplicability for space-ground links, and nongeometry-based stochastic channel models (NGSCMs) might lack spatial consistency and offer lower accuracy, we present a scalable tutorial for the channel modeling of dual mobile space-ground links in urban areas, utilizing the Quasi Deterministic Radio Channel Generator (QuaDRiGa), which adopts a geometry-based stochastic channel model (GSCM), in conjunction with an International Telecommunication Union (ITU) provided state duration model. This tutorial allows for the generation of realistic channel and delay coefficients in a multipath environment for dual mobile space-ground links. We validate the accuracy of the work by analyzing the generated channel and delay coefficient from several aspects, such as received signal power and amplitude, multipath delay distribution, delay spread and Doppler spectrum.