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ACTA AERONAUTICAET ASTRONAUTICA SINICA ›› 2014, Vol. 35 ›› Issue (5): 1365-1373.doi: 10.7527/S1000-6893.2013.0514

• Electronics and Control • Previous Articles     Next Articles

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)

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

CLC Number: