航空学报 > 2014, Vol. 35 Issue (5): 1365-1373   doi: 10.7527/S1000-6893.2013.0514

联合正交变换与信号交织的测距仪脉冲干扰抑制方法

刘海涛1, 成玮1, 张学军2   

  1. 1. 中国民航大学 天津市智能信号与图像处理重点实验室, 天津 300300;
    2. 北京航空航天大学 电子信息工程学院, 北京 100191
  • 收稿日期:2013-06-28 修回日期:2013-12-16 出版日期:2014-05-25 发布日期:2014-02-28
  • 通讯作者: 刘海涛,Tel.:022-24092455 E-mail:htliu@cauc.edu.cn E-mail:htliu@cauc.edu.cn
  • 作者简介:刘海涛男,博士,教授,硕士生导师。主要研究方向:宽带移动通信,航空移动通信。Tel:022-24092455E-mail:htliu@cauc.edu.cn;成玮男,硕士研究生。主要研究方向:航空移动通信。Tel:022-24092455E-mail:cwronaldo7@sina.com;张学军男,博士,教授,博士生导师。主要研究方向:宽带移动通信,航空移动通信。Tel:010-82317847E-mail:zhxj@buaa.edu.cn
  • 基金资助:

    国家自然科学基金(U1233117,61271404);国家“863”计划(2011AA11010102)

DME Pulse Interference Mitigation Method Based on Joint Orthogonal Transform and Signal Interleaving

LIU Haitao1, CHENG Wei1, ZHANG Xuejun2   

  1. 1. Tianjin Key Lab for Advanced Signal Processing, Civil Aviation University of China, Tianjin 300300, China;
    2. College of Electronic and Information Engineering, Beihang University, Beijing 100191, China
  • Received:2013-06-28 Revised:2013-12-16 Online:2014-05-25 Published:2014-02-28
  • Supported by:

    National Natural Science Foundation of China (U1233117, 61271404);National High-tech Research and Development Program of China (2011AA11010102)

摘要:

为解决宽带航空数据链以内嵌方式工作在测距仪(DME)频道间而带来测距仪发射脉冲信号干扰宽带航空数据链正交频分复用(OFDM)接收机的问题,提出一种联合正交变换与信号交织的OFDM传输方法。首先,该方法利用测距仪脉冲信号在频域呈现为强相关高斯脉冲的特性,通过发射机正交变换与信号交织器,配合接收机解交织器与逆正交变换器将强相关脉冲转换为非相关脉冲;随后,基于期望最大化(EM)算法迭代重构非相关随机脉冲;最后,通过频率域脉冲干扰消除抑制脉冲干扰。仿真结果表明:所提出联合正交变换与信号交织的OFDM传输方法可有效抑制测距仪脉冲干扰,显著提高OFDM接收机链路传输的可靠性。

关键词: 宽带航空数据链, 正交频分复用, 测距仪, 相关脉冲干扰, 期望最大化算法

Abstract:

To mitigate the deleterious influence of distance measurement equipment (DME) interference on orthogonal frequency division multiplexing (OFDM) receiver of broadband aeronautical data link system operating as an inlay system, a new transmission method for OFDM system is proposed based on a joint orthogonal transform and signal interleaving. Firstly, utilizing the characteristic of DME pulse signal, i.e., it exhibits a strongly correlated Gaussian pulse in the frequency domain, together with the orthogonal transformer and signal interleaver at the transmitter, we use the corresponding signal deinterleaver and inverse orthogonal transformer at the receiver to convert the correlated Gaussian pulse into uncorrelated random pulse. Secondly, the uncorrelated random pulse is reconstructed by expectation maximization (EM) iterative algorithm. Finally, the uncorrelated random pulse is eliminated in frequency domain. Simulation results show that the proposed transmission method for OFDM system based on a joint orthogonal transform and signal interleaving can suppress the correlated DME pulse interference effectively and significantly improve the reliability of the OFDM system.

Key words: broadband aeronautical data link, orthogonal frequency division multiplexing, distance measurement equipment, correlated impulse interference, EM algorithm

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