Terahertz Channel Modeling With Beckman-Kirchhoff Scattering Theory

Terahertz band has become an important candidate band for future wireless communication systems.Due to the short terahertz wavelength,the influence of scattering from the material surface on the channel needs to be considered.Aiming at the scattering problem,Beckmann-Kirchhoff scattering theory is introduced to model the scattering path,and the channel characteristics of terahertz are deeply studied.Based on Beckman-Kirchhoff scattering theory,the reflection and scattering of terahertz wave on material surface are comprehensively reviewed.Then the rough degree classification of rough surface is introduced and analyzed.The specular and non specular scattering coefficients are separated to correct the low roughness scattering coefficient.At the same time,we use the effective roughness model to analyze the scattering.In the channel model,Beckmann-Kirchhoff scattering coefficient is used to modify the terahertz channel model.Based on ray tracing technology,considering the influence of scattering on terahertz channel,a unified terahertz multi-ray channel model is optimized.Combined with the measurement results of relevant literature,the accuracy of the modified model is verified.Based on the modified channel model,the indoor office scene is modeled.The tracking method of scattering path is introduced in detail.Then ray tracing technology is used to simulate the modeling scene.The received power,communication capacity and delay spread of terahertz channel are calculated.Based on indoor terahertz wireless communication scenario,the characteristics of channel capacity,delay spread and coherent bandwidth are comprehensively analyzed.The results show that due to high frequency selectivity,resource allocation is very important in the development of terahertz spectrum,and has high coherent bandwidth.