Indoor mobile channel modelling and simulation based on ray tracing

In modern communication systems, efficient and accurate channel modeling is very important to improve communication performance and system design. Ray tracing, as the mainstream channel modeling method, has the problem of low computing efficiency due to the large number of rays. In this paper, a dynamic uniform grid acceleration algorithm based on hash table is proposed. The target scene is evenly divided, and the intersection detection calculation speed of ray and objects is accelerated by order traversing of the uniform grid. Then, the motion model of indoor scene is introduced to simulate and analyze the statistical distribution of Doppler shift of mobile terminal in indoor scene. Finally, the received power distribution and power delay distribution of the model are simulated and analyzed in indoor scene at 5GHz. The simulation results show that the dynamic uniform grid acceleration algorithm based on hash table can improve the performance of ray intersection detection and the computational efficiency of ray tracing compared with the traditional bounding volume hierarchy acceleration algorithm.