| 一种改进的变步长自适应滤波器LMS算法 |
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| 引用本文： | 徐凯,纪红,乐光新. 一种改进的变步长自适应滤波器LMS算法[J]. 电路与系统学报, 2004, 9(4): 115-117 |
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| 作者姓名： | 徐凯 纪红 乐光新 |
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| 作者单位： | 北京邮电大学 电信工程学院,北京,100876 |
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| 基金项目： | 国家自然科学基金资助项目(90104018，60172052，60002009) |
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| 摘 要： | 本文提出一种改进的LMS算法(即MS-LMS)，并建立了步长因子μ与误差信号e(n)之间另一种新的非线性函数关系。该关系不仅具有原有算法在误差e(n)接近零处缓慢变化的优点，而且低信噪比环境下比原有算法具有更好的收敛性能。理论分析和计算机仿真结果表明，在低信噪比的环境下，改进算法的收敛速度和稳态误差的性能指标都有较大的提高，并对系统发生的突变表现出较强的鲁棒性。
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| 关 键 词： | 自适应滤波 变步长自适应滤波算法 LMS算法 均方误差 |
| 文章编号： | 1007-0249(2004)04-0115-03 |
| 修稿时间： | 2003-03-02 |
A Modified LMS Algorithm for Variable Step Size Adaptive Filters |
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| XU Kai,JI Hong,YUE Guang-xin. A Modified LMS Algorithm for Variable Step Size Adaptive Filters[J]. Journal of Circuits and Systems, 2004, 9(4): 115-117 |
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| Authors: | XU Kai JI Hong YUE Guang-xin |
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| Abstract: | A modified LMS algorithm, which establishes another new non-linear functional relationship between m and e(n), is proposed. This functional relationship not only has the virtue of e(n) slightly changing close to zero, but also has better performance than that of the former algorithms in the low SNR circumstance. Theoretical analysis and computer simulations show that with the proposed algorithm, convergence rate and misadjustment can be improved than the former in low SNR environments. Simulations also show that the algorithm is robust against to the abrupt change of the system. |
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| Keywords: | adaptive filtering variable step size adaptive filtering algorithm LMS algorithm MSE |
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