The Research On Indoor Terahertz High Speed Communication Technology

With the rapid development of information technology in recent years,the data traffic of wireless communication has increased exponentially,with the increasing demand for higher-speed wireless communication technologies.Especially in the past three decades,the data rate of wireless communication has doubled every 18 months,and is currently approaching the capacity limit of current mainstream communication systems.In order to meet the future demand for wireless communication technology in the information society,it is a method to develop more advanced physical layer solutions.More importantly,new wireless communication spectrum is needed to support the future high data rate.At present,the commercialization of the fifth-generation mobile communication technology(5G)has approached maturity.The research on the sixthgeneration mobile communication technology has already been carried out.The terahertz frequency band(0.1-10THz)is considered to be one of the most promising communication frequency bands in the future.Provide strong support for the sixth generation mobile communication system.Compared with traditional communication technology,terahertz communication has greatly improved in communication rate,network connection density,spectrum efficiency,etc.,and can well solve the problem of spectrum scarcity and capacity limitation of current wireless systems.Rich application scenarios,including wireless backhaul,onchip network,high-speed space communication,military secret communication,indoor Internet of Things,wireless data center,etc.However,due to the high communication frequency,terahertz communication has a high path loss,and the effective transmission distance is greatly limited.At the same time,terahertz waves have a unique molecular absorption effect and are more sensitive to water vapor in the transmission medium.So in the future,6G technology based on terahertz is most likely to be deployed in indoor scenarios first.When the terahertz frequency band is used in indoor communication,it will face more obvious communication blocking problems.The terahertz indoor communication system is very sensitive to the blocking effect caused by obstacles,and has great research significance and value for the research and analysis of the communication blocking effect under the terahertz indoor communication.This paper analyzes and mathematically models the indoor communication blocking problem in the terahertz band,and proposes two reliable and easy-to-handle models.Based on the two models,the mathematical expressions of the corresponding communication blocking probabilities are derived.Furthermore,we rely on the obtained model to simulate the effects of different parameters of the indoor environment on the blocking probability of the communication system,and analyze the effects of human interference on the performance of the indoor communication system.In a terahertz-based indoor wireless network,multi-user interference will be a key performance limiting factor.We use random geometry to model multi-user interference in indoor communication networks.According to the model obtained,the expressions of the average aggregate interference power and coverage probability of the receiver in isotropic antenna and directional antenna modes are derived respectively.Combined with the numerical simulation results,the interference distribution for terahertz communication in indoor scenarios And coverage capabilities were systematically studied.The simulation results prove the rationality of the interference model based on isotropic antenna and directional antenna,and further prove that the use of directional antenna can improve the performance of indoor communication system.The study of terahertz indoor channels directly affects the performance of communication systems.In order to establish a reliable indoor channel model,we first use radiation transmission theory and a basic database to model and study the molecular absorption effect in a terahertz indoor communication scenario,and then set random reflection points in the indoor transmission model to simulate indoor objects The reflection effect of Hertz waves,combined with the Monte Carlo method and the obtained molecular absorption effect model,simulated the indoor direct channel model and the non-direct channel model.