Wireless Channel Testing And Modeling Under 4G Environment

The advent of 4G brings convenience to communications and poses a difficult problem for communication.In the communication system,the channel becomes an uncontrollable part of the puzzle.The channel is divided into wired and wireless channels.Due to uncontrollable becomes the most important content by the environment,the channel fading caused by the environment includes three aspects,large scale fading and small scale fading and average path loss,in which large scale fading is an important aspect of this study.The traditional model of large scale by working frequency,antenna distance effect,narrow scope,usually with lognormal shadowing model,by fitting the measured data,refine the path loss exponent and standard deviation,establish corresponding model environment.In this paper,Yunnan University of Nationalities campus environment and Matsushige reservoir based on mountain environment,using spectrum analyzer,field testing of 4G base station in two environments,and extract the working frequency of the received power data of 2585mhz and 1895mhz,using the minimum mean square error and the standard deviation of the measured data rate under the path loss exponent and standard deviation for the introduction of the concept of deviation rate to determine the advantages and disadvantages of the two methods,according to the lognormal shadow model of two kinds of large scale fading environment model,the key analysis environment in radio wave transmission in the process of the use,provides a reference model and corresponding large scale fading environment in the concept of environment for the base station and channel workers.Firstly,the research purpose and significance of the combination this paper,reviews the development of the communication system,analyzes the contribution of workers at home and abroad in the wireless channel,and introduces the basic knowledge of the characteristics of large scale fading and the corresponding model and the modeling method and related theory.Secondly,this paper selected the Yunnan University of Nationalities campus under the environment of a transmitter and receiver(T-R).Between the building block line and Matsushige reservoir mountain environment under the T-R by the mountain barrier line as the test site,using the spectrum analyzer,respectively on the two lines into the road Field test data,the test data will be processed by the log path loss model,using MATLAB modeling and simulation,according to the relevant experimental results illustrate the correctness of the simulation results.Finally,analysis of the impact of the minimum mean square error method and standard deviation rate of the campus environment and mountain environment model,introduced the deviation the concept of rate,establishes two kinds of environment of the two models.In the two kinds of environment,we introduce two line of sight line to contrast with the selected line formation,effect analysis of buildings and mountains in the electromagnetic wave signal,by comparing the two kinds of environment,that environment is very important in the wireless channel.