Calibration Method For Field Strength Prediction Model Based On Ray Tracing

In the area of wireless communications,deterministic channel modeling by electromagnetic simulation has been widely used.Originated from computer graphics,ray tracing method is used much more widely than many other deterministic simulation methods.Accuracy and time complexity are affected by many factors.Some trade-offs must be done in different requirements and applied scenarios.These factors are RT scene modeling method,path search algorithm,number of iterations,electromagnetic parameters,antenna simulation and so on.For site-specific indoor scene,this article completes a whole RT calculation,the main works are: triangulation scenario modeling,brute-force path search algorithm,the power-ray tube transmitter,receiving ball of ray tube and parameters calibration by iterative method.Through these steps,the electromagnetic field for a specific scene field point can be accurately predicted.The main innovation of this paper is the improvement of parameter calibration.We use step-iterative method to calibrate the receiving radius and use adaptive simulated annealing method to calibrate the electromagnetic parameters.For an indoor scene,we did some simulation and measurement work.It improves the accuracy of brute-force algorithm.