Analysis and Simulation of System Based on PLC

Low-voltage power line channel has serious noise pollution and poor channel environment issues.Channel estimation algorithm was studied with OFDM system based on the power channel.Least squares estimation(LS) algorithm is of low complexity,but the performance is limited because noise impact.In comprehensive consideration of the performance and complexity,some new estimators for LS was proposed.Simultaneously,the shortcomings of the time domain FFT-based interpolation algorithm were analyzed,and an improved algorithm for the time domain FFT-based interpolation algorithm was presented.The simulation results show that the algorithm can improve the error rate,reduce the noise to some extent,and improve signal to noise ratio.