北京邮电大学学报

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北京邮电大学学报

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基于倒谱的OFDM信号盲检测方法研究(增刊)

张海瑛

  

  1. 北京邮电大学继续教育学院(即北京邮电大学通信网络综合技术研究所;北京邮电大学培训中心)
  • 收稿日期:2006-10-13 修回日期:2006-12-04 出版日期:2007-06-30 发布日期:2007-06-30
  • 通讯作者: 贾嘉

A Method for Blind Detection of OFDM Signal Based on Cepstrum Processing

  • Received:2006-10-13 Revised:2006-12-04 Online:2007-06-30 Published:2007-06-30

摘要: 提出一种基于倒谱的OFDM 信号盲检测方法,该方法充分利用了OFDM信号谱线的隐含周期性,具有较强的抑制加性干扰和乘性干扰的能力,能够在较低的信噪比条件下快速准确地检测OFDM信号,可以精确估计出OFDM信号的子载波频率间隔、符号周期、信号带宽、子载波数目,具有运算量小、精度高、适于硬件实现等特点。仿真结果进一步说明了该检测方法的有效性。

关键词: 盲检测, 正交频分复用, 倒谱, 子载波频率间隔估计

Abstract: A method for Blind Detection of OFDM Signal Based on Cepstrum Processing is presented, which makes use of hidden periodicity of OFDM spectrum and has strong ability to bate the add interference and multiply interference so as to identify OFDM signals at lower signal/noise ratio. It not only can accurately estimate the sub-carrier frequency interval, symbol periods, bandwidth and sub-carrier numbers of OFDM signals but also has lower computational complexity and more accurate estimation, which are proper for hardware implement. The simulations further demonstrate the effectivity of our scheme.

Key words: Blind Detection, Orthogonal Frequency Division Multiplexing (OFDM), Cepstrum Processing, Sub-carrier Frequency Interval Estimation.