English

应用科学学报 ›› 2006, Vol. 24 ›› Issue (3): 236-239.

• 论文 • 上一篇    下一篇

改进的OFDM符号粗同步算法

雷俊, 吴乐南   

  1. 东南大学无线电工程系, 江苏南京 210096
  • 收稿日期:2005-01-16 修回日期:2005-05-01 出版日期:2006-05-31 发布日期:2006-05-31
  • 作者简介:雷俊,博士生,研究方向:OFDM及其同步;E-mail:leijun_nc@hotmail.com;吴乐南,教授,博导,研究方向:多煤体信号处理、数字广播;E-mail:wuln@seu.edu.cn

Improved Coarse Symbol Synchronization Algorithms for OFDM Systems

LEI Jun, WU Le-nan   

  1. Department of Radio Engineering, Southeast University, Nanjing 210096, China
  • Received:2005-01-16 Revised:2005-05-01 Online:2006-05-31 Published:2006-05-31

PDF

90

被引次数

8

摘要： 利用周期前缀是OFDM系统中普遍的符号粗同步方法,但传统方法在多径信道中估计的定时位置会随路径能量的变化而在各条路径变动,导致滞后于理想位置而引入ISI和ICI.基于周期前缀在尾部ISI较弱的特点,提出了一种改进的符号粗同步算法,可有效克服时延扩展的影响,将定时点集中于第1条到达路径.在中短波信道中的仿真结果验证了该算法的良好性能.

关键词: 正交频分复用, 符号同步, 时间同步

Abstract: Symbol beginnings estimated by conventional methods utilizing the cyclic prefix (CP) continually vary with the path energies in OFDM systems, therefore ISI and ICI are inevitable.An improved coarse symbol synchronization algorithm impervious to delay spread is proposed in this paper.Only employing the rear of CP, timing positions of the proposed method concentrate on the first path in multi path environments.Simulation results in MW/SW channels show excellent performance of this approach.

Key words: symbol synchronization, OFDM, time synchronization

中图分类号: