摘要
针对严重线性失真的水声信道,在分析正交小波包变换理论和判决反馈盲均衡算法的基础上,利用正交小波包变换良好的去相关性特性,对判决反馈盲均衡算法的前馈滤波器权向量进行修正,提出了基于正交小波包变换的判决反馈盲均衡算法(WPT-DFE)。与基于正交小波变换的判决反馈盲均衡算法(WT-DFE)和常规判决反馈盲均衡算法(CMA-DFE)相比,该算法具有收敛速度快、跟踪性能好、稳态误差小的特点。水声信道的仿真结果,验证了算法的有效性。
For overcoming effect of the underwater acoustic channel on communication quality, orthogonal Wavelet Packet Transform based Decision Feedback blind Equalization algorithm （WPT-DFE） was proposed, on the basis of analyzing orthogonal wavelet packet transform theory and the feature of decision feedback blind equalization algorithm. In this proposed WPT-DFE algorithm, correlativity of signals is lowed by orthogonal wavelet packet transform and iterative formula of forwardback weight vectors is modified by using orthogonal wavelet packet transform. The proposed WPT-DFE algorithm outperforms orthogonal Wavelet Transform based Decision Feedback blind Equalization algorithm （WT-DFE） and traditional Decision Feedback blind Equalization algorithm based on Constant Modulus Algorithm （CMA-DFE） in convergent rate, tracking performance, and Mean Square Error （MSE）. The efficiency of the proposed WPT-DFE algorithm is proved by computer simulation with underwater acoustic channels.
出处
《系统仿真学报》
CAS
CSCD
北大核心
2010年第3期570-572,共3页
Journal of System Simulation
基金
全国博士论文作者专项基金(200753)
江苏省高等学校自然科学基金(08KJB510010)
江苏省"六大人才高峰"培养对象资助(2008026)
江苏省自然科学基金(BK2009410)
南京信息工程大学科研机构和创新团队(2009)(JG0803
TD0810)
关键词
正交小波包变换
判决反馈
盲均衡
水声信道
orthogonal wavelet packet transform
decision feedback
blind equalization
underwater acoustic channels
