作者在文献〖４〗中提出了一种改进的瞬变步长ＳＰＬＭＳ自适应滤波算法。本文在ＳＰＬＭＳ算法的基础上，进一步提出一种基于瞬变步长、瞬变平滑因子的双瞬变ＳＰＬＭＳ算法－ＤＳＰＬＭＳ算法。该算法除具有常规ＬＭＳ算法简单的优点外，还具有更高的起始收敛速率、更小的权失调噪声和更大的抑噪能力．文中重点讨论了瞬变步长、瞬变平滑因子的变化特性。计算机仿真结果支持了理论分析。

A raodified adaptive algorithm of smooth pseudo LMS (SPLMS) was presented in reference [4] by authors of this paper. Forwardly, based on SPLMS, a modified adaptive algorithm with two transient factors (DSPLMS) is proposed in this paper. Besides the advantages of LMS,it has faster beginning convergence rate, lower misadjustment of weight and better robustness against noise and disturbance. This paper lays special emphases on the transformation of two transient factors. The theoretical analysis is confirmed by computer simulation rasults.

TN911.7

国家自然科学基金和陕西省自然科学基金资助项目(项目编号：69872030，98X08)．