摘要
为了提高LMS自适应滤波算法的性能,在分析已有变步长算法的基础上进行了一些改进。改进算法用误差信号的自相关来调节步长以实现对不相关噪声的更好抑制,且采用先固定后变化的方法控制步长,兼顾了暂态和稳态性能。利用改进算法进行了自适应噪声抵消的仿真实验,结果表明,基于改进变步长LMS算法的自适应噪声抵消器能有效抵制噪声干扰,对含噪信号具有良好的消噪能力。
To improve the performance of LMS adaptive filtering algorithm,an improved variable-step LMS algorithm is proposed based on analysis of existing algorithms.With the autocorrelation step regulation of error signal,the improved algorithm realizes the better uncorrelated noise inhibiting ability.It gives consideration to both transient and steady performance by the step control method of first fixation and last variation.The simulation experiments of adaptive noise cancellation illustrate that the adaptive noise canceller based on modified variable step LMS algorithm has a better de-noising performance for the noise signal.
出处
《电讯技术》
北大核心
2010年第11期30-33,共4页
Telecommunication Engineering
关键词
自适应滤波
噪声抵消
LMS算法
变步长
adaptive filtering
signal de-noising
LMS algorithm
variable step
