北京邮电大学学报

  • EI核心期刊

北京邮电大学学报 ›› 2004, Vol. 27 ›› Issue (3): 68-72.

• 论文 • 上一篇    下一篇

小波变换在OFDM系统频偏估计中的应用

袁超伟1, 刘 静1, 李亦农2   

  1. 1.北京邮电大学 通信网络综合技术研究所, 北京 100876;
    2.北京邮电大学 电信工程学院, 北京 100876
  • 收稿日期:2003-06-17 出版日期:2004-03-28
  • 作者简介: 袁超伟(1961—), 男, 教授, E-mail:yuancw2000@sohu.com.

Frequency Offset Estimation in the OFDM System Using Wavelets Transform

YUAN Chao-wei1, LIU Jing1, LI Yi-nong2   

  1. 1.Institute of Communication Networks Integrated Technique, Beijing University of Posts and Telecommunications, Beijing 100876, China;
    2.Telecommunication Engineering School, Beijing University of Posts and Telecommunications, Beijing 100876, China
  • Received:2003-06-17 Online:2004-03-28

摘要: 提出了一种基于小波变换的正交频分复用(OFDM)系统频偏估计的新方法,这种方法与其他频偏估计方法的不同在于,它不需要知道不稳定信号的平均接收功率,也不需要变化的时间观察窗,仿真显示,它可以跟踪频偏的变化,具有自适应特性,估计方法简单易行,且精度较高。

关键词: 正交频分复用, 频偏估计, 多普勒频移, 小波变换

Abstract: A suggestion, based on wavelet transform, was proposed to estimate the frequency offset in the orthogonal frequency division multiplexing(OFDM) system. Compared with the existed methods, the new method of frequency offset estimation does not have to know the received averaging power of unsteady signals and to open the windows for varied time observation. Also, the new form of wavelet transform is adaptive and is able to track the swing of frequency offset. The simulation shows that it has higher precision. With the help of it, the estimation for frequency offset in the OFDM system could be done very well.

Key words: orthogonal frequency division multiplexing, frequency offset estima-tion, Doppler shift, wavelets transform

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