Research On Channel Estimation Algorithms Of Power Line OFDM Communication

In this paper,low-voltage power line channel characteristics is analysed.Based on the analysis of the channel estimation algorithms mostly used in the low-voltage power line OFDM communication,two improved channel estimation algorithms are given.One is the improved LS channel estimation algorithm,which makes channel frequency response between the two pilot symbols just as simple linear distribution.This algorithm,which not only improves the linear relationship but also avoids the proliferation of errors,uses pre-channel estimation value to equalize the next receiving symbol,and makes a feedback loop between the two pilot symbols.The other is a channel estimation algorithm based on the B-spline interpolation,which can get the whole channel frequency response through the pilot symbols of B-spline interpolation,and then,get the accurate channel estimation by amendment.It can follow the tracks of changes in channel,and the estimated curve approaches to the practical channel more in channel characteristics.