Research On High Frequency Channel Models Based On Ray Acceleration Tracing

The development law of mobile communication in the tenth generation,the wireless channel model is imminent based on the study of wireless communication.In traditional wireless channel simulators,statistical models such as Rayleigh fading model are used to simulate channel characteristics.However,the application of statistical models is further restricted due to the continuous increase of mobile communication operating frequency bands resulting in excessive signal attenuation.The modulo standard method has been determined to be a deterministic model based on ray tracing,so the channel simulation part of the wireless channel emulator is in urgent need of a channel simulation module that supports deterministic modeling.This paper takes the evolution direction of the channel modeling standard method and the requirements of instrument development as the background,and the deterministic modeling method as the starting point,in-depth research on its representative method ray tracing algorithm and acceleration structure,and in the selfdesigned ray tracing software The simulation verification of the IEEE 802.11 ad 60 GHz channel model is completed on the platform.The key research content of this subject will have certain practical significance in the channel simulation module of the domestic channel emulator to support the deterministic model and future high-frequency channel modeling.In this paper,the deterministic model method is accurately positioned from the evolution direction of the channel modeling standard,and the typical ray tracing algorithm and acceleration structure of the deterministic model are deeply studied and optimized.Finally,the ray tracing software platform is implemented and successfully compared and verified with the standard model.The main research contents of this paper are:(1)In-depth research on channel standard methods and summarize the specific evolution direction of B5G/6G channel modeling.From the research of 2/3/4G to 5G modeling standard methods,it can be seen that the channel modeling standard method has been determined from a statistical model based on field measurements to a deterministic model based on ray tracing.On the basis of this research,the future research methods of highfrequency channel modeling are further determined,and three main evolution directions of channel modeling methods for B5G/6G are proposed.(2)The subdivision strategy method of the ray tracing acceleration algorithm is optimized and the dynamic update algorithm of the acceleration structure for the non-stationary environment is proposed.Through the research on the SAH subdivision algorithm of the space acceleration structure,the intersection complexity of the original algorithm is equal and 1 is improved and optimized.According to the different propagation forms of the material of the modeled scene objects,the cost value of the intersection detection complexity is different.Therefore,the algorithm is used.Complexity O(n)Maximum intersection complexity of equivalent ray and bounding box.Compared with before the improvement,the space division efficiency is increased by about 11.1%.After the improvement and optimization,the division algorithm is more reasonable and has better adaptability in highfrequency channel modeling.At the same time,a dynamic update algorithm of the bounding box hierarchy tree of the high-frequency channel dynamic modeling scene is proposed.Compared with the reconstruction algorithm,the dynamic update algorithm can improve the execution efficiency by about 40%,which provides algorithm support for the rapid and accurate realization of high-frequency channel modeling.(3)Finally,based on the research contents of the first two parts,the ray tracing platform is designed and implemented based on C++ and Open GL,and the conference room scene of IEEE 802.11 ad 60 GHz is successfully verified.On the platform side,the material file library and the core code module of the complete propagation mechanism are generated.Finally,the channel modeling of the IEEE 802.11 ad 60 GHz conference room scene is realized through the ray tracing platform.The modeling results are basically consistent with the standard model distribution.