Research On Wireless Channel Transmission Loss Testing And Simulation In Several Indoor Scene

In recent years,the development of wireless communication shows a blowout.People's work and life are more and more inseparable from it.At the same time,the mobile communication system has also developed to the fifth generation due to and the pursuit of the increasing demand of people.The trend is to pursue higher speed,lower delay and less cost.As a branch of wireless communication technology,short-range wireless communication technology is receiving people's favor.It has the advantages of wide use and strong reliability.In order to provide infinite possibilities for the future vision,it is constantly improving and making it adapt to more scenes.Short-range wireless communication technology is commonly used in indoor environments.Due to the complex indoor scene,radio waves will encounter various obstacles during the transmission process.It is essential to do Effective research on the transmission characteristics of short-range wireless channel.Based on the research,suitable transmission models need to be established and the relevant parameters of wireless channel transmission should be analyzed.Also,it lays the foundation for making link budget based on the environment,improving transmission loss,improving wireless communication performance and solving the influence of indoor small-scale fading.Therefore,the main work of this paper is to study the transmission loss of indoor short-range wireless channel.Firstly,the information involved in short-range wireless channel transmission are summarized.Then,the calculation of the main wireless channel parameters is derived,and several common path loss models are compared.According to the indoor propagation characteristics,a wireless channel parameter measurement platform is established,and the frequency-domain measurement method is used to test channel parameters of line-of-sight and non-line-of-sight in a laboratory environment at 5.4 GHz.After data processing and calculation,the transmission parameter model is obtained.Secondly,the multi-wall loss of the indoor home environment at 2.4 GHz frequency band is studied.The power change curve is obtained through simulation and measurement.Then,the data is fitted to obtain the corresponding path loss exponent and other parameters.The results are substituted into the general model to get the general model suitable for home environment,and the simulation and measurement results are compared.Finally,in order to study the transmission characteristics in the corridor environment of WiFi(5GHz)frequency band,a new path loss model is proposed.This model involves line-of-sight and non-line-of-sight transmission loss in the corridor environment,and considers the influence of the corridor width.Then,the model is compared with existing models to verify its applicability and accuracy.At the same time,in order to reduce the impact of transmission loss,a method of setting a virtual reflector is used to improve transmission loss and performance.