The Field Strength Prediction Method Based On Ray Tracing Model With Data Interpolation Algorithm

Field strength prediction of radio waves is crucial for grid planning on wireless communications,while the accuracy and efficiency of prediction has always been the major problem for researchers.In recent years,the model of RT(ray tracing)stands out for its wide range of applications.However,how to further reduce the computational complexity while remaining a relatively high accuracy still bothers.This paper uses ray tracing method to model indoor micro-cell scenes,and makes the scenes into rectangular grid.By utilizing forward ray tracing algorithm,the path loss value of grid center is calculated.After that,use date interpolation algorithm to predict the value of field points in the scene.Using this method to predict the field strength can improve the computation efficiency without lose accuracy of the prediction through the analysis and validation of the simulation data.The main innovation points of this paper is that data interpolation algorithm based on using ray tracing algorithm to calculate receiving signal.Combined with the nearest neighbor interpolation,inverse distance weighting and Lagrange interpolation,three-step method is proposed.This method comes up with different interpolation strategy by judging the position between sites and center of the grid,which can guarantee the field strength prediction precision and realize the improvement of computational complexity.