首页 | 本学科首页   官方微博 | 高级检索  
     检索      

基于小波变换的自适应多用户检测算法
引用本文:张小飞,徐大专,杨蓓.基于小波变换的自适应多用户检测算法[J].南京航空航天大学学报(英文版),2004,21(2).
作者姓名:张小飞  徐大专  杨蓓
作者单位:南京航空航天大学信息科学与技术学院,南京,210016,中国
基金项目:江苏省自然科学基金 ( BK2 0 0 3 0 89)资助项目~~
摘    要:在分析传统自适应多用户检测的基础上 ,提出了一种基于小波变换的自适应多用户检测算法。用小波变换进行前处理 ,然后再通过 LMS算法实现自适应多用户检测。与通常的自适应多用户检测算法相比 ,该算法利用了小波变换对小波空间进行了分解 ,信号经小波变换后自相关性会下降 ,收敛速度提高。同时在此分解过程中 ,根据信号与白噪声在不同尺度上的小波变换模极大值表现完全不同的特性进行信号的消噪。理论分析和仿真结果表明 ,该算法收敛速度较快 ,计算量增加较少 ,易于实时实现 ,而且具有良好性能。同时仿真实验表明 ,收敛速度与小波基选择有关 ,对于同一小波基系列 ,小波基的正则性越好收敛速度越快

关 键 词:多用户检测  小波变换  多分辨率分析  多址干扰  自适应多用户检测

NOVEL ADAPTIVE MULTIUSER DETECTION ALGORITHM BASED ON WAVELET TRANSFORM
ZHANG Xiao-fei,XU Da-zhuan,Yang Bei.NOVEL ADAPTIVE MULTIUSER DETECTION ALGORITHM BASED ON WAVELET TRANSFORM[J].Transactions of Nanjing University of Aeronautics & Astronautics,2004,21(2).
Authors:ZHANG Xiao-fei  XU Da-zhuan  Yang Bei
Abstract:The wavelet transform-based adaptive multiuser detection algorithm is presented. The novel adaptive multiuser detection algorithm uses the wavelet transform for the preprocessing, and wavelet-transformed signal uses LMS algorithm to implement the adaptive multiuser detection. The algorithm makes use of wavelet transform to divide the wavelet space, which shows that the wavelet transform has a better decorrelation ability and leads to better convergence. White noise can be wiped off under the wavelet transform according to different characteristics of signal and white noise under the wavelet transform. Theoretical analyses and simulations demonstrate that the algorithm converges faster than the conventional adaptive multiuser detection algorithm, and has the better performance. Simulation results reveal that the algorithm convergence relates to the wavelet base, and show that the algorithm convergence gets better with the increasing of regularity for the same series of the wavelet base. Finally the algorithm shows that it can be easily implemented.
Keywords:multiuser detection  wavelet transform  multi-resolution analyses  multi-access interference (MAI)  adaptive multiuser detection
本文献已被 CNKI 万方数据 等数据库收录!
设为首页 | 免责声明 | 关于勤云 | 加入收藏

Copyright©北京勤云科技发展有限公司  京ICP备09084417号