# Dynamic Modeling and Analysis of Channel Characterization for RIS-Aided V2V Wireless Communication Systems

## TL;DR

This paper introduces a 3D model for improving wireless communication between vehicles using reconfigurable intelligent surfaces, addressing signal challenges caused by motion and obstructions.

## Contribution

A 3D channel model and analytical expressions for Rician fading in RIS-assisted V2V systems are proposed.

## Key findings

- The model captures time-varying propagation due to moving transmitters, receivers, and RIS.
- Simulation methods and numerical results show how RIS motion and scatterer distribution affect signal stability.

## Abstract

Recently, wireless channel in vehicle-to-vehicle (V2V) communications is highly challenging due to rapid signal fluctuations, multi-path fading, and frequent obstructions. To mitigate these issues, this paper proposes a three-dimensional (3D) end-to-end channel model for reconfigurable intelligent surface (RIS)-assisted V2V wireless channels. The proposed channel model incorporates the motions of the mobile transmitter (MT), mobile receiver (MR), and a UAV-mounted RIS, capturing time-varying propagation characteristics. Key contributions include the derivation of exact analytical expressions for the level crossing rate (LCR) of the Rician fading envelope, along with efficient deterministic and stochastic simulation methods. Numerical results analyze the impact of RIS motion direction and scatterer distribution on the LCR, providing theoretical insights for optimizing RIS-assisted V2V systems in wireless communication environments.