An Improved Equiangular Division Algorithm for SBR based Ray Tracing Channel Modeling

TL;DR

This paper introduces an iterative equiangular division algorithm that enhances the accuracy of SBR-based ray tracing for channel modeling, achieving precision comparable to image method while maintaining speed.

Contribution

The paper proposes a novel iterative equiangular division algorithm that improves the accuracy of SBR ray tracing for channel modeling, addressing its low-accuracy limitation.

Findings

Error of AOD and AOA below 0.01 degrees

Power delay profile matches image method results

Uniform ray launching improves accuracy

Abstract

Compared with image method (IM) based ray tracing (RT), shooting and bouncing ray (SBR) method is characterized by fast speed but low accuracy. In this paper, an iterative precise algorithm based on equiangular division is proposed to make rough paths accurate, allowing SBR to calculate exact channel information. Different ray launching methods are compared to obtain a better launching method. By using equiangular division, rays are launched more uniformly from transmitter (Tx) compared with the current equidistant division method. With the proposed iterative precise algorithm, error of angle of departure (AOD) and angle of arrival (AOA) is below 0.01 degree. The relationship between the number of iterations and error reduction is also given. It is illustrated that the proposed method has the same accuracy as IM by comparing the power delay profile (PDP) and angle distribution of paths. This can solve the problem of low accuracy brougth by SBR.