Channel Modeling And Simulation Of High Frequency Radio Waves In Wireless Network Planning

From the birth of the first generation of mobile communication technology to the sixth generation of mobile communication technology,mobile communication technology is evolving,and the carrier frequency used in signal transmission is also rising.Different from the low frequency wave,the high frequency wave has high sensitivity to the propagation environment due to its small wavelength,and the influence of scattering on signal transmission is more obvious.Therefore,the future-oriented wireless network planning software needs to predict the scattering loss of electromagnetic waves and optimize the antenna module and multipath synthesis module that are greatly affected by the scattering phenomenon in the channel modeling and simulation.Based on the wireless network planning software developed by our research group,this paper studies the scattering model of high frequency electromagnetic wave,and combines it with ray tracing model to construct a new module suitable for high frequency radio channel simulation.The main research contents of this paper are as follows:(1)Due to the scattering phenomenon,there is a large deviation between the antenna gain value obtained in the ray tracing process and the actual antenna gain value.In this paper,an antenna gain scattering method suitable for the ray tracing model is designed.The antenna gain scattering module is constructed and the function of the module is simulated and analyzed.The results show that the module can smooth the antenna pattern and reduce the deviation of antenna gain value.(2)In order to predict the scattering loss in the process of high frequency electromagnetic wave transmission,this paper studies the common scattering models.According to the power concentration distribution characteristics of different scattering models,Lambertian model is selected and combined with ray tracing model.The scattering module including scattering ray search and scattering loss calculation is constructed,and the scattering simulation function of high frequency electromagnetic wave is realized.Combined with the actual map scene,the scattering module of the software is tested,and the results show that the module achieves the expected simulation effect.(3)The sensitivity of high-frequency radio to the propagation environment will cause the phase shift of multipath signals,thereby affecting the effect of multipath synthesis.In this paper,the multi-path synthesis theory of ray tracing model is studied,and the multi-path synthesis effect of weight coefficient method and expectation method is compared and analyzed.The results show that the multi-path synthesis effect of expectation method is better than that of weight coefficient method in LOS and NLOS scenarios,so the multi-path synthesis module of software is optimized by expectation method.Combined with the actual map scene,the channel modeling and simulation of high-frequency radio are carried out in this paper.The research results show that the scattering power in LOS scene accounts for about 3 percentage points in the total power of the receiving point,and it can reach about 15 percentage points in NLOS scene,which proves that the scattering phenomenon has an important influence on the channel modeling and simulation of high-frequency radio.