| 摘要: |
| 结合变换域最小均方（LMS）和变步长LMS算法的优势，提出了一种基于小波变换
的变步长LMS自适应均衡方法。该方法中步长调整函数采用了改进的Sigmoid函数，该函数具
有简单且误差信号接近零时变化缓慢的特点。并且，在训练模式、判决引导模式以及混合模
式下，将提出方法和传统均衡方法进行了仿真比较。结果表明，所提出的方法比传统的线性
LM
S算法、变步长LMS以及小波变换LMS收敛更快、性能更优。 |
| 关键词: 自适应信道均衡 线性均衡 LMS算法 变步长 小波变换 |
| DOI： |
|
| 基金项目:国家自然科学基金资助项目(61101167)；河南省
科技攻关计划项目(112102210431)；河南科技大学博士科研
启动基金资助项目(09001409)；河南科技大学青年科学基金资助项目(2010QN0019 |
|
| Adaptive channel equalization using variable step size LMS algorithm based on wavelet transform |
| WANG Dan,YANG Lei,PU Jie-xin |
| (Electronic Information Engineering College,Henan University of Science and Tec
hnology,Luoyang 471003,China) |
| Abstract: |
| By combining the advantages of transform domain least mean square (LMS
) and variable step size LMS algorithms,an adaptive linear equaliz
ation LMS algorithm using variable step size based on wavelet transform domain i
s proposed,
where the step size is adjusted as an improved Sigmoid function. This function
is simple and varies slowly as the error signal approaches zero. Moreover, the
proposed method is compared with the traditional channel equalization methods in
the training mode, the decisiondirected mode and the hybrid mode, respectively
.
Simulations show that the proposed method may offer higher convergence rate and
better equalization performance than the conventional LMS method, the variable
step size LMS method and the LMS method based on wavelet transform domain. |
| Key words: adaptive channel equalization linear equalization LMS algorithm var
iable step size wavelet transform |
