电信科学 ›› 2011, Vol. 27 ›› Issue (6): 89-92.doi: 10.3969/j.issn.1000-0801.2011.06.023

• 研究与开发 • 上一篇    下一篇

基于特定导频OFDM信道估计的研究

郭滨,刘大力   

  1. 长春理工大学电子信息工程学院 长春 130022
  • 出版日期:2011-06-15 发布日期:2011-06-15

Study on Channel Estimation for OFDM Systems Based on Specific Pilots

Bin Guo,Dali Liu,I Gasumba   

  1. School of Electronics and Information Engineering,Changchun University of Science and Technology,Changchun 130022,China
  • Online:2011-06-15 Published:2011-06-15

摘要:

在OFDM系统中,准确的信道估计是对抗瑞利衰落信道中信道干扰的关键。提出了一种对OFDM信道估计的新方法,利用CR Spline函数的插值方法,设计一个特定的导频结构,从而导出信道估计的CR Spline函数形式,用该函数近似信道衰落包络。实验结果表明,仅用少量导频就可以近似出信道特性,并具有良好的平滑性。计算机仿真证明了提出算法的有效性。

关键词: 信道估计, OFDM, ICI, 快衰落, CRSpline, 多普勒频移

Abstract:

In OFDM systems,accurate channel estimation is the key to against the effect of the interchannel interference in a multipath Rayleigh fading channel.In this paper,a novel channel estimation method for mobile OFDM systems is proposed by using the interpolation technique based on Catmull-Rom(CR)Spline function.Using CR Spline function interpolation method to design a specific pilot structure,This leads to a CR Spline function form for channel estimation.This method can estimation the channel fading envelope with a few pilot.The validity of the proposed pilot structure and channel estimation with CR Spline function is demonstrated by computer simulations.

Key words: channel estimation, OFDM, ICI, fast fading, CR Spline, doppler shift

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