关键词: 电力线通信, 信道估计, 时频变换, 最小二乘, 线性最小均方误差

Abstract:

For the G3-PLC protocol,two improved time-domain channel estimation methods are proposed in this paper.Presetting the maximum-delay of power line channel is used to achieve time-domain noise reduction.However,the corresponding time-frequency transform matrix is rank-deficient,and the LS criterion is not suitable for estimating the time-domain characteristics.To solve the problem,this paper presents a time domain channel estimation method based on modified matrix.And a time-domain LMMSE channel estimation method without channel statistics is proposed to reduce the complexity of the algorithm.The simulation results show that both the modified LS algorithm and the simplified LMMSE algorithm have good performance.

Key words: power line communication;channel estimation;time-frequency transform;least squares;linear minimum mean square error