OFDM Communication Coupling And Bit Error Rate Analysis Of Medium Voltage Power Lines

With the rapid development of smart grid,communication system on the transmission efficiency,automation and reliability requirements are increasingly high,the traditional single carrier system and multi-carrier system has been unable to meet the communication needs.OFDM technology can greatly improve the channel capacity and transmission rate of wireless communication system,and can effectively resist multi-path fading,suppress interference and noise,has a broad application prospects.Medium-voltage power line broadband carrier communication technology is the best way to solve the bottleneck problem of distribution network automation.Efficient and reliable coupling technology is the basis of high-speed broadband transmission of power line communication.It requires signal transmission in a wide frequency band,but The traditional power line coupling method can not meet the requirements of reliable and high speed.The main contents of this paper are as follows:(1)In this paper,the network characteristics of medium voltage distribution network and the network structure of power grid are introduced.Through the use of smart grid communication system platform and TPS-2024 oscilloscope to collect the relevant data of the medium voltage power line channel through the analysis of measured data to obtain the power line channel model,through the preparation of M function file to achieve multipath fading,through the Matlab Fcn module into simulink Model,other noise data,through the MAT format file from the File module to import simulink model.(2)Aiming at the realization of the communication coupling system model,this paper uses Matlab/simulink to realize the construction of each module of the OFDM communication coupling model of the MV network power line.Based on the system block diagram of OFDM power line carrier coupled communication,the parameters of each module are The simulation results and the results show that the OFDM modulation technique can effectively overcome the frequency selection fading characteristics of the power line channel transmission in the communication medium of the power line and enhance the performance of the power line channel.System of anti-multipath interference performance.By channel comparison,adding channel coding can improve the overall performance of power line communication system.In addition,subcarriers with different modulation methods(such as QPSK,DQPSK,QAM,etc.)have different effects on the bit error rate of the system,and the impact of the various modulation modes on the bit error rate is also different for different signal-to-noise ratios different.(3)In the process of establishing Simulink simulation model of medium voltage power line OFDM coupling communication,the problems encountered in the simulation are analyzed and solved.Combined with the GUI system,the GUI system and Simulink model are realized by selecting the control and setting the corresponding parameters to the control Of the parameters of the transfer,this open function can be continuously expanded and improved for the practical application of the parameters to provide a more convenient way to optimize.