计算机工程与应用 ›› 2009, Vol. 45 ›› Issue (4): 23-25.DOI: 10.3778/j.issn.1002-8331.2009.04.007

• 博士论坛 • 上一篇    下一篇

全相位OFDM系统的最大自相关帧同步

孙山林1,2,侯春萍1   

  1. 1.天津大学 电子信息工程学院,天津 300072
    2.桂林航天工业高等专科学校,广西 桂林 541004
  • 收稿日期:2008-10-09 修回日期:2008-11-13 出版日期:2009-02-01 发布日期:2009-02-01
  • 通讯作者: 孙山林

Maximal auto-correlation of frame synchronization for all phase OFDM systems

SUN Shan-lin1,2,HOU Chun-ping1   

  1. 1.School of Electronic and Information Engineering,Tianjin University,Tianjin 300072,China
    2.Guilin College of Aerospace Technology,Guilin,Guangxi 541004,China
  • Received:2008-10-09 Revised:2008-11-13 Online:2009-02-01 Published:2009-02-01
  • Contact: SUN Shan-lin

摘要: 针对数字地面广播电视(DTMB)系统,提出了一个对载波频偏具有鲁棒性的新的帧同步算法。该算法通过正交频分复用(OFDM)信号的时域复制和对接收信号实行自相关来实施。自相关数值输出的非关联求和的峰值检测是理所当然的帧起始点。理论证明,载波频率偏移(CFO)对全相位自相关帧同步算法没有影响。通过仿真表明,在频率选择性衰落信道中,提出的方法在有频偏存在情况下比传统算法具有很强的优势,对于DTMB系统的PN420模型,系统保持稳定工作的最大CFO在所提方法中要远远大于传统的方法。

关键词: 载波频率偏移, 数字地面广播电视, 全相位正交频分复用, 自相关帧同步算法

Abstract: In this paper,a novel frame synchronization technique,which is robust to Carrier Frequency Offset(CFO),is proposed for Digital Terrestrial Multimedia/television Broadcasting(DTMB) systems.This technique is derived through using the copy signal of Orthogonal Frequency Division Multiplexing(OFDM) system in time domain and performing autocorrelation of the received signal.The metric for peak detection is defined as the non-coherent summation of the autocorrelation magnitude outputs.It is shown through computer simulation that the proposed techniques generally outperform the conventional ones when CFO occurs,over frequency-selective fading channels.For a DTMB system using PN420 mode,the maximal allowed CFO to keep system still working normally of the proposed scheme is larger than that of the conventional method.

Key words: Carrier Frequency Offset(CFO), Digital Terrestrial Multimedia/television Broadcasting(DTMB), All phase Orthogonal Frequency Division Multiplexing(OFDM), auto-correlation frame synchronization