Interpolation Techniques for Fast Channel Estimation in Ray Tracing

TL;DR

This paper introduces an interpolation-based method for fast, high-fidelity channel estimation in ray tracing, significantly reducing computational load while maintaining accuracy in complex wireless environments.

Contribution

It proposes a novel interpolation technique for ray tracing that captures wavefront geometry, enabling efficient and accurate large-scale wireless channel simulations.

Findings

Achieves high-fidelity channel predictions with fewer computations

Demonstrates significant speedup over exhaustive ray tracing

Validates method through empirical comparisons

Abstract

Ray tracing is increasingly utilized in wireless system simulations to estimate channel paths. In large-scale simulations with complex environments, ray tracing at high resolution can be computationally demanding. To reduce the computation, this paper presents a novel method for conducting ray tracing at a coarse set of reference points and interpolating the channels at other locations. The key insight is to interpolate the images of reflected points. In addition to the computational savings, the method directly captures the spherical nature of each wavefront enabling fast and accurate computation of channels using line-of-sight MIMO and other wide aperture techniques. Through empirical validation and comparison with exhaustive ray tracing, we demonstrate the efficacy and practicality of our approach in achieving high-fidelity channel predictions with reduced computational resources.