Research On Short-range Wireless Channel Propagation Characteristics In Indoor Office Environment

With the rapid development of Internet technology and intelligent mobile terminal technology,people are paying more and more attention to and rely on wireless communication.Wireless communication technology has also developed rapidly.In recent years,both in theory and in application,wireless communication technologies have been developed.There is a qualitative leap.Among them,the short-range wireless and mobile communication services that are closest to our lives have sprung up.Because of their low cost,high reliability,and practicability,they have shown great potential for application.It not only plays an important role in the fields of military,industry,science,medical care,and daily life,but also provides unlimited possibilities for the development of various application systems in the future.While relying more and more on short-range wireless and mobile communication services,people are paying more and more attention to short-range wireless communication service systems mainly used in indoor places.Generally,the propagation environment of indoor short-range wireless systems is complicated and numerous.Changed,but greatly improved the quality of people's lives and work.Therefore,the main work of this paper is to correctly describe the propagation characteristics of short-range wireless channels,including large-scale and small-scale fading,and to solve related techniques of frequency domain measurement,and enhance the propagation performance of indoor short-range wireless communication systems.Firstly,in order to comprehensively analyze the propagation characteristics of the indoor short-range wireless channel,the RF signal controlled by the vector network analyzer and the MSP430F149 single-chip microcomputer is used to build an indoor wireless transmission channel frequency domain measurement platform,and the indoor wireless channel in the 5.0-5.8 GHz band is measured.And analysis,the measurement of the propagation mode is LOS and NLOS,the measurement results confirm the availability of the path loss model of the previous study.Secondly,in order to improve the accuracy of the link loss model,a new type of wall wear loss model is proposed.Different from the past,this paper takes into account the influence of frequency variation and antenna polarization on the wall loss.The frequency-dependent through-wall loss factor and the polarization factor associated with the antenna polarization mode are added to provide a theoretical model and measurement system for the study of wireless channels in a typical indoor propagation environment.Finally,a tap delay line model capable of describing multipath channel fading is proposed for indoor office environment,and channel test experiments are carried out in two environments: office area and corridor.Then,the relevant parameters of the model are extracted by fitting the experimental data.The statistical rule of the tap amplitude is obtained,and the propagation characteristics of the indoor short-range multipath channel are described in more detail.