Design And Implementation Of Key Modules Of Power Line Carrier Communication System Based On OFDM

In recent years,with the rapid development of Smart grid,Smart home and Smart Internet of Things,Power Line Communication technology,which requires no Communication wiring and is convenient for seamless coverage,has become one of the research hotspots in current Communication methods.However,due to the characteristics of strong noise interference,impedance mismatch and multipath fading in power line network,the communication environment is extremely bad,so the OFDM technology with good antiburst noise interference and fading ability has become a widely used basic technology in power line communication system.Based on the international standard of IEEE 1901.1 power line communication proposed by China Electric Power Research Institute in recent years,this paper studies the power line carrier communication system based on OFDM,including the design and implementation of the system,OFDM synchronization technology and impulse noise counter technology.The main work are as follows: 1.The overall design of power line communication system based on IEEE1901.1 standard is given,and the design and implementation of communication module are completed.Including the module core device selection and embedded platform test.2.This paper presents an improved algorithm of OFDM synthetical synchronization based on training sequence.The effect of symbol timing deviation and carrier frequency deviation on the received signal in OFDM system is analyzed.the synchronization performance of traditional OFDM synchronization algorithm on the leading structure of the designed system is studied,and an improved comprehensive synchronization algorithm based on training sequence is designed for the defects of traditional algorithm.Matlab simulation results show that the improved algorithm is more accurate in symbol timing synchronization and carrier frequency synchronization.3.An improved power line impulse noise suppression method based on compressed sensing technology is presented.This paper introduces three kinds of power line noise models,studies the impulse noise suppression method based on compressed sensing technology on Bernoulli-Gaussian noise model,and presents an improved algorithm.Matlab simulation results show that the improved algorithm has better performance in sparse signal reconstruction and can effectively resist power line impulse noise.