1.This point out that in order to improve the LMS algorithm performance, the gradient are optimally estimated, or the error signal are nonlinearity processed,these methods are equipollent.

1.对最速下降法梯度优化估值和对误差信号非线处理，是改善LMS算法措施。

2.A new variable step-size LMS adaptive filtering algorithm is presented, which makes use of the intercorrelation function of the relative output error signal to control the new variable step-size.

2.针对上述问题，提出了一种新变步长LMS自适应滤波算法，它采用相对误差互相关函数来控制步长更新。