Analysis And Application Of Millimeter Wave Indoor Wireless Communication Channel Characteristics Based On Ray Tracing Method

With the growth of wireless communication services,in order to solve the shortage of spectrum resources and meet the demand of large-capacity and high-speed communication,millimeter-wave frequency band with high bandwidth has become the research focus of the new generation of mobile communication technology.Based on the ray tracing method,the propagation characteristics of MMW under different indoor scenes and the design and application of indoor wireless network addressing schemes were simulated and analyzed,and the 60 GHz frequency band of MMW was mainly selected for the following research.Specific work and innovation contents are as follows:(1)Firstly,a simulation platform was built based on the measured environmental data in the literature,and the effects of simulation accuracy,calculation time,diffraction and transmission were analyzed according to the simulation data under indoor millimeter-wave line-of-sight and non-line-of-sight propagation paths.It is proved that the fourth order reflection,the first transmission,the first diffraction is the most appropriate way,and the simulation results are compared with the measured results,which verifies the feasibility and correctness of the simulation experiment based on the ray tracing method.(2)The propagation characteristics of millimeter wave channel are analyzed in a typical indoor corridor environment.The path loss and delay spread of MMW in 10 GHz,28GHz and 60 GHz frequency bands were analyzed in line-of sight and non-line-of sight respectively.It was found that the increase of frequency would cause greater path loss and numerical fluctuation.In terms of delay spread,28 GHz not only showed smaller delay spread but also the minimum numerical fluctuation.After the simulation comparison of different roughness in the environment,it is concluded that the rough surface not only causes the increase of path loss,but also can significantly reduce the delay spread.Finally,based on the electromagnetic characteristics of human body,the propagation characteristics of millimeter wave in different frequency bands with the presence of human body shielding are studied.(3)According to the reversible push characteristic of ray path in ray tracing method,an indoor optimal addressing scheme for transmitting station is proposed,and simulation modeling analysis and verification are carried out for different indoor scenes.Firstly,the characteristics of path reversible push based on the ray tracing method are studied.The position exchange of the transceiver has almost no effect on the receiving signal of the receiver,which verifies the feasibility of the experimental method.Based on the above characteristics,a simulation study was carried out for the MMW 60 GHz frequency band in the indoor scene of small residential buildings,and the optimal transmitting station location of home base station in this scene was found out,and the simulation comparison and verification were made with other different stations.In addition,an improved addressing scheme based on K-means algorithm is proposed for the densely populated large indoor environment,which can reduce the number of locations and transmitters that need to be identified to reduce the amount of simulation computation,and thus improve the addressing efficiency.Finally,based on the improved addressing scheme,the addressing error of the optimal transmitting site and the simulation calculation time are compared and analyzed in the scene of large indoor office building,and the correctness of the improved addressing scheme is verified by the analysis from the perspective of the wireless network capacity.