华南理工大学学报(自然科学版) ›› 2005, Vol. 33 ›› Issue (8): 49-53.

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相位噪声下OFDM系统中的信道估计与均衡

张浩1 叶梧1 王恒辉1 童调生2   

  1. 1.华南理工大学 电子与信息工程学院,广东 广州 510640;2.湖南大学 电气与信息工程学院,湖南 长沙 410082
  • 收稿日期:2004-10-26 出版日期:2005-08-25 发布日期:2005-08-25
  • 通信作者: 张浩(1975-),男,博士生,主要从事下一代移动终端设计研究 E-mail:zsumei@21 cn.corn
  • 作者简介:张浩(1975-),男,博士生,主要从事下一代移动终端设计研究
  • 基金资助:

    国家自然科学基金资助项目(60272051);广东省自然科学基金资助项目(31391)

Channel Estimation and Equalization in OFDM System with Phase Noise

Zhang Hao1  Ye Wu1  Wang Heng-hui1  Tong Tiao-sheng2   

  1. 1.College of Electronic and Inform ation Engineering,South China Univ. of Tech.,Guangzhou 510640,Guangdong,China;2.College of Electric and Inform ation,Hunan Univ.,Changsha 410082,Hunan,China
  • Received:2004-10-26 Online:2005-08-25 Published:2005-08-25
  • Contact: 张浩(1975-),男,博士生,主要从事下一代移动终端设计研究 E-mail:zsumei@21 cn.corn
  • About author:张浩(1975-),男,博士生,主要从事下一代移动终端设计研究
  • Supported by:

    国家自然科学基金资助项目(60272051);广东省自然科学基金资助项目(31391)

摘要: 分析了相位噪声对正交频分复用(OFDM)系统的影响,发现相位噪声不仅产生通用相角错误(CPE),而且还会产生载波间干扰(ICI),这都使OFDM 系统的性能急剧恶化,因此必须对CPE和ICI进行校正.文中给出了基于MSE准则的CPE校正方法,考虑到ICI干扰主要来源于相邻信道,进而提出了基于LMS法则的自适应相邻信道干扰消除方法.整个算法简单高效.仿真结果表明,所提出的算法大大改善了OFDM 系统的性能.

关键词: 正交频分复用, 通用相角错误, 载波间干扰, 信道估计

Abstract:

By analyzing the effect of phase noise on the OFDM system,it is found that phase noise results in not only common phase error(CPE)but also intercarrier interference(ICI)that degrade the performance of the OFDM system.The effect of phase noise on the orthogonal frequency division mutliplexing(OFDM)system is analyzed.Phase noise results in not only CPE but also ICI that degrade the perform ance of the OFDM system.Hence the corrections of CPE and ICI must be carried out.In this paper,a CPE corection method based on the MSE criterion is first given.As ICI mainly results from the adjacent channels,a method of adaptively eliminating the adjacent chan. nel interference is then put forward based on the LMS law.Th e proposed algorithm is simple and efficient,whose efect on the perform ance improvement of the OFDM system is finally verified by simulated results simulation resuhs

Key words: orthogonal frequency division mutliplexing, common phase eror, intercarrier interference, channel estimation