Research On Characteristics And Modeling Of Indoor Terahertz Channel

Although the large transmission rate and delay that the fifth-generation mobile communication system can provide can still meet the needs at the current stage,it is foreseeable that in the future,with the rapid development of services,higher transmission rate and lower delay will be required.The requirements of the mobile communication system will continue to increase,and finally,just like the previous upgrade of the mobile communication system,a higher frequency band can only be sought to meet the demand.With the development of 6G research,the spectrum resources in the terahertz band will be used to carry higher transmission rates and larger channel capacity.However,it should be noted that with the increase of frequency,on the one hand,it brings higher requirements for the frequency and transmission power of hardware devices,and the low-frequency measurement platform will not be able to be applied.On the other hand,it brings about the increase of path transmission loss and the emergence of new features,the channel model of the previous communication scenario will no longer be applicable.Therefore,it is necessary to analyze and model the channel characteristics of the terahertz channel.Focusing on the terahertz frequency band,this paper selects two typical application scenarios,indoor short-range scenarios and office scenarios,and conducts measurements by building a terahertz channel measurement platform to extract channel parameters such as path loss,root mean square delay spread,and Rice K factor,and conduct modeling research on it to analyze the channel propagation characteristics in indoor scenarios.The channel modeling results will provide theoretical model support for the construction of future 6G terahertz communication systems.The specific research contents are as follows:Firstly,build a terahertz channel measurement platform.Based on the signal generator and vector network analyzer,this paper builds a terahertz channel measurement platform with mixers as key components,and introduces in detail the working principle and platform parameters of the time-domain correlation detection platform based on pseudo-random sequences.The bandwidth of the terahertz channel measurement platform reaches 2GHz,and the measurement frequency reaches 220～330GHz,which can realize broadband measurement in high frequency bands.Secondly,carry out characteristic analysis and channel modeling of indoor short-range scenarios.Indoor short-range scenarios are one of the typical indoor application scenarios.At the same time,most of the existing research on shortrange scenarios is carried out using ray tracing technology,with few actual measurements.In this paper,220～330GHz channel measurement is carried out in indoor short-distance scenarios,the frequency dependence of path loss parameters and the statistical model of distance are analyzed,and the channel characteristics research and construction of small-scale parameters such as root mean square delay spread and Rice K factor are carried out.Thirdly,carry out characteristic analysis and channel modeling of indoor office scenarios.In this paper,channel measurements are carried out in the terahertz frequency band of 100 GHz over a distance of several meters in an office scene.The channel characteristics analysis and statistical modeling of terahertz channels are carried out from the two aspects of large-scale channel parameters and small-scale channel parameters,which provide guidance for the construction of future 6G terahertz communication systems.