Research On Propagation Characteristics Of Low Frequency Bands Of 5G Candidates

The wireless communication technology has seen a rapid development in recent years and has been widely applied in various fields such as broadband wireless access area,mobile communication field and satellite remote control and telemetry field.And people's living habits have even been changed due to the emergence of wireless communication technology.IMT-2020(5G)is a new generation of mobile communication system developed to meet the demand of mobile communication after 2020,bearing ultra-high frequency spectrum and energy efficiency,and is one of the research hotspots within the field of communication at present.IMT-2020 system has a wide range on frequency spectrum,which can be divided into high frequency and low frequency.The hybrid frequency could meet the frequency requirements of both users and businesses under a variety of propagation environments.However,the constant development of wireless communication systems requires the support of wireless spectrum resources,besides,the current mobile communication system is mainly working in low-mid frequency band at 6 GHz,so that its available continuous-frequency spectrum resources are pretty scarce.On the one hand,to explore the feasibility of high frequency band for the new generation mobile communication technology;on the other hand,to sort out the frequency band resources below 6GHz to maximize the utilization of low frequency band resources,based on above,it is an effective method to solve the shortage of spectrum resources.In this paper,the main work is to sort out the resources below 6GHz and study the propagation characteristics of low frequency candidate bands below 6GHz.The practical work is to carry out channel measurement of three different lower frequency bands at 6GHz under different transmission environments.Based on a large number of actual measurement data,the big data BP machine modeling method with more advantages is adopted to compare the path loss of parameters of large-scale fading characteristics.After analyzing the influence of transmission environment and different transmission frequencies on propagation characteristics,to make the evaluation against the wireless communication system of low-frequency candidate frequency band,so as to provide some research results with reference value for the development of new generation wireless communication system.