华南理工大学学报(自然科学版) ›› 2010, Vol. 38 ›› Issue (5): 6-10.doi: 10.3969/j.issn.1000-565X.2010.05.002

• 电子、通信与自动控制 • 上一篇    下一篇

基于TD-LMS算法的OFDMA上行链路载波频率偏移消除

关庆阳 赵洪林 郭庆   

  1. 哈尔滨工业大学 通信研究所, 黑龙江 哈尔滨 150001
  • 收稿日期:2009-04-10 修回日期:2009-06-04 出版日期:2010-05-25 发布日期:2010-05-25
  • 通信作者: 关庆阳(1982-),男,博士生,主要从事无线通信物理层研究. E-mail:guan_qy@163.com
  • 作者简介:关庆阳(1982-),男,博士生,主要从事无线通信物理层研究.
  • 基金资助:

    国家自然科学基金资助项目(60532030)

Elimination of Carrier Frequency Offset in Uplink OFDMA System Based on TD-LMS Algorithm

Guan Qing-yang  Zhao Hong-lin  Guo Qing   

  1. Communication Research Center,Harbin Institute of Technology,Harbin 150001,Heilongjiang,China
  • Received:2009-04-10 Revised:2009-06-04 Online:2010-05-25 Published:2010-05-25
  • Contact: 关庆阳(1982-),男,博士生,主要从事无线通信物理层研究. E-mail:guan_qy@163.com
  • About author:关庆阳(1982-),男,博士生,主要从事无线通信物理层研究.
  • Supported by:

    国家自然科学基金资助项目(60532030)

摘要: 提出了一种时域自适应最小均方误差算法(TD-LMS)来消除正交频分多址接入(OFDMA)系统上行链路的各载波频率偏移引起的干扰.该算法首先对OFDMA系统接收端的时域信号进行估计,并利用估计量来预消除载波频率偏移,然后在时域内进行残留频率偏移消除.仿真结果表明,在相同的仿真条件下,与最小二乘算法相比,该算法可以获得3dB的增益,且对各用户的频率偏移有明显的消除效果.

关键词: 正交频分多址接入, 载波频率偏移, 时域, 信噪比

Abstract:

A time-domain adaptive algorithm based on least mean square(TD-LMS) is proposed to eliminate the interference due to the carrier frequency offset(CFO) from different users in uplink OFDMA(Orthogonal Frequency Division Multiple Access) system.In this algorithm,the CFO in time domain is estimated and is adjusted with an estimator.Then,the residual CFO is eliminated with TD-LMS scheme in time domain.Simulated results indicate that,as compared with the algorithm based on least square,the proposed algorithm is effective in eliminating the CFO of users,with a gain of 3dB in the same simulation conditions.

Key words: orthogonal frequency division multiple access, carrier frequency offset, time domain, signal-to-noise ratio