| 一种新的变换域自适应LMS滤波算法 |
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| 引用本文： | 苏钢,朱光喜,刘应状.一种新的变换域自适应LMS滤波算法[J].微电子学与计算机,2007,24(8):65-68. |
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| 作者姓名： | 苏钢 朱光喜 刘应状 |
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| 作者单位： | 1. 华中科技大学,电信系,湖北,武汉,430074
2. 华中科技大学,电信系,湖北,武汉,430074;武汉光电国家实验室(筹),湖北,武汉,430074 |
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| 基金项目： | 国家高技术研究发展计划(863计划);国家自然科学基金 |
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| 摘 要： | 为了改善时变系统中的LMS算法收敛速度,一般可以在变换域进行自适应处理。通过研究和分析分数阶傅里叶变换与时-频平面的关系,提出在分数阶傅里叶变换域进行自适应时-频滤波。所提出的方法首先搜索最佳变换域,然后在分数阶傅里叶变换域进行LMS自适应滤波。仿真结果表明,与目前一些基于变换域的方法对比,新方法通过对时-频平面的旋转,可以显著加速算法收敛性。
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| 关 键 词： | 变化域LMS 分数傅里叶变换 自适应滤波 |
| 文章编号： | 1000-7180（2007）08-0065-04 |
| 修稿时间： | 2006-02-30 |
A Novel LMS Algorithm in Transform Domain Adaptive Filtering |
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| SU Gang,ZHU Guang-xi,LIU Ying-zhuang.A Novel LMS Algorithm in Transform Domain Adaptive Filtering[J].Microelectronics & Computer,2007,24(8):65-68. |
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| Authors: | SU Gang ZHU Guang-xi LIU Ying-zhuang |
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| Affiliation: | 1 Dept. of Electronics and Information Engineering, HUST, Wuhan 430074, China; 2 Wuhan National Laboratory for Optoeleetronies, Wuhan 430074, China |
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| Abstract: | Transform domain LMS adaptive filtering is widely used in time varying system. The fractional Fourier transform (FRFT) is one of generalized Fourier transform,and its relationships with time-frequency representations have a very simple and natural form,which support LMS adaptive filtering in the FRFT domain. The appropriate fractional domain is found before LMS adaptive time-frequency filtering in the FRFT domain. The simulation results indicate that the novel method can speed convergence effectively via a rotation of the time-frequency plane compared to those existing transform domain approaches in literature. |
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| Keywords: | transform domain LMS fractional fourier transform adaptive filtering |
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