Research FDD-LTE On Communication Coverage Technology In High Speed Railway Environment

With the continuous progress of modern science and technology,the development of mobile communication also began has made considerable progress,Chinese communication network from the beginning of the 2G to 3G network,and then to today,the development of 4G communication technology is mature,users in a communication network speed gradually improve,at the same time,the corresponding data transmission transmission quality is guaranteed.Today's research at home and abroad can be seen the user communication data traffic site of production mainly concentrated in the interior,and for some outdoor scenes is the user communication data traffic in high incidence area,for example,high iron environment,the user for the network communication quality and coverage is put forward higher requirements.However,for the indoor and outdoor environment,the communication network technology,fdd-lte communication way will be outdoor complex environment influence,resulting in the data transmission accuracy and rate exists some problems.Therefore,how to optimize the fdd-lte communication scheme has become a problem to be solved.Aiming at the above problems.Firstly,this paper of today's fdd-lte communication technology were analyzed,including the network planning and network of the build process,then has carried on the analysis to the existing fdd-lte propagation model in different environmental engineering application.This paper takes DL station(railway station)as the research background,the traditional indoor communication network technology of optimization design,and give full consideration to the obstacle influence factors of the high iron,the wireless signal reflection and diffraction of factors are analyzed.The optimization scheme using ray tracing method for transmission of scene analysis,scene of the influence factors and the transmission path attrition planning,finally put forward a position antenna optimization strategy,through the position optimization makes the single antenna in coverage range to guarantee unifonn signal coverage.According to the optimization scheme of simulation experiment,which mainly includes the analysis of the coverage of the single antenna.Firstly,the coverage of 3D modeling,and the antenna in different position of the edge of the path loss calculation.Through Matlab anlysis of the simulation results,the FDD-LTE communication mode of the proposed optimization scheme can guarantee the average value of the single antenna area path loss and minimum variance,the path loss is the lowest.So it can be seen that the optimization scheme proposed in this paper can improve the coverage of the communication network in the high-speed railway environment,and the scheme can guarantee the uniformity of the signal in the coverage area.