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  1. (西安电子科技大学 电子工程学院,陕西 西安 710071)
  • 收稿日期:1900-01-01 修回日期:1900-01-01 出版日期:2007-12-20 发布日期:2007-12-20

Symbol rate estimation of orthogonal frequency division multiplexing (OFDM) signals

ZHENG Wen-xiu;ZHAO Guo-qing;LUO Ming

  1. (School of Electronic Engineering, Xidian Univ., Xi′an 710071, China)
  • Received:1900-01-01 Revised:1900-01-01 Online:2007-12-20 Published:2007-12-20

摘要: 针对正交频分复用(OFDM)信号参数估计和解调的实际应用,提出一种精确估计码速率的方法.利用高阶循环累积量精确估计出的OFDM信号子载波构造辅助信号,对其进行小波变换获得码元跳变信息,进而采用谱分析实现信号码速率的精确估计.该算法无需信号的先验信息,易于通信侦察接收设备的实现.仿真实验表明,对信噪比大于0dB采用相移键控(PSK)和星形正交幅度(QAM)调制的OFDM 信号,码速率估计误差小于0.1%,该算法的估计正确率均在99%以上.

关键词: 通信对抗, 正交频分复用(OFDM), 参数估计, 小波变换

Abstract: Aiming at the real application of OFDM signals’ parameter estimation and demodulation, a method is proposed for the accurate estimation of the symbol rate. The OFDM sub-carriers, accurately estimated by the high-order cyclic cumulants, are used to construct an auxiliary signal, of which the symbol jumping information is abstracted by the wavelet transform. Furthermore, its spectrum analysis can perform the accurate symbol rate estimation. The method needs no prior information so that it is easy for the communication reconnaissance and receiving equipments to implement. And simulation indicates that the proposed method has the correction of 99% for the symbol rate estimation of OFDM signals modulated by PSK and star-QAM with SNR> 0dB when the estimation error is within 0.1%.

Key words: military electronic countermeasures, orthogonal frequency division multiplexing(OFDM), parameter estimation, wavelet transforms


  • TN971.4