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 (5): 41-44.

• 论文 • 上一篇    下一篇

OFDM系统中快速频偏估计

张中山, 刘晓明, 赵 明, 刘元安, 高锦春   

  1. 北京邮电大学 无线通信中心, 北京 100876
  • 收稿日期:2003-09-08 出版日期:2004-05-28
  • 作者简介: 张中山(1974—), 男, 博士生. E-mail:adhoc@bupt.edu.cn;刘元安(1963—), 男, 教授, 博士生导师。E-mail:yuliu@bupt.edu.cn
  • 基金资助:
    国家“863计划”项目(2003AA12331004)

Fast Frequency Offset Estimation in OFDM System

ZHANG Zhong-shan, LIU Xiao-ming, ZHAO Ming,
LIU Yuan-an, GAO Jin-chun   

  1. Cen ter f or Wi reless Comm unicati ons, Bei jing Universit y of Pos t s and Tel ecom municat ions , Bei jing 100876, China
  • Received:2003-09-08 Online:2004-05-28

摘要: 提出了正交频分复用(OFDM)系统中一种新的载波频偏估计算法。载波频偏估计过程可分为获取和跟踪,其中,获取过程和时间同步是同时完成的。新算法可实现的最大载波频偏获取范围是整个信号带宽的一半。新的跟踪算法是一个最大似然算法,在加性白噪声高斯信道(AWGN)下,当N(训练序列长度的一半)等于128时,其性能比Schmidl算法提高约7.27 dB;在多经信道下,当信噪比不是很高时,新算法仍具有优势。

关键词: 频偏估计, 多径信道, 正交频分复用

Abstract: A new carrier frequency offset estimation scheme in orthogonal frequency division multiplexing(OFDM)system is proposed.The carrier frequency offset estimation includes acquisition and tracking,and acquisition as well as timing synchronization can be performed simultaneously with high accuracy.The maximum acquisition range can be up to one half of overall signal bandwidth.The proposed tracking estimator is a maximum-likelihood estimator,and in AWGN channel,about 7.27dB improvement is obtained compared to the Schmidl's algorithm when N=128; in multipath channel,the proposed algorithm works well at moderate SNR.

Key words: frequency offset estimation, multipath channel, orthogonal frequency division multiplering

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