联合压缩感知与干扰白化的脉冲干扰抑制方法
发布时间：2019-01-07 21:11
【摘要】：针对L频段数字航空通信系统1(L-DACS1)以内嵌方式部署在航空无线电导航频段而产生的测距仪脉冲干扰(DME)正交频分复用(OFDM)接收机的问题,提出联合压缩感知与残留干扰白化的测距仪脉冲干扰抑制方法.首先接收机通过空子载波信道来观测测距仪脉冲干扰,并利用测距仪脉冲干扰在时域的稀疏特性,基于l1范数最小化约束的凸优化方法重构测距仪脉冲干扰;然后将重构的脉冲干扰转换到频域进行干扰消除;最后,接收机通过信号解交织器与逆正交变换器将残留的脉冲干扰转换为高斯白噪声,避免了残留干扰信号造成的突发性解调错误.仿真研究表明:联合干扰抑制方法可有效消除测距仪脉冲信号干扰,显著提高L-DACS1系统链路传输的可靠性.
[Abstract]:Aiming at the problem that the L-band digital aeronautical communication system 1 (L-DACS1) is embedded in the aviation radio navigation frequency band, the range finder pulse interference (DME) quadrature frequency division multiplexing (DME) (OFDM) receiver is discussed. A method of pulse interference suppression for rangefinder combined with compression sensing and residual interference whitening is proposed. First, the receiver uses the empty subcarrier channel to observe the range finder pulse interference, and reconstructs the range finder pulse interference based on the convex optimization method with minimum constraints of L1 norm by using the sparse characteristic of the range finder pulse interference in time domain. Then the reconstructed pulse interference is converted to frequency domain for interference cancellation. Finally, the receiver converts the residual pulse interference into Gao Si white noise by signal deinterleaver and inverse orthogonal converter, which avoids the sudden demodulation error caused by the residual interference signal. The simulation results show that the combined interference suppression method can effectively eliminate the pulse signal interference of the rangefinder and improve the reliability of the link transmission in the L-DACS1 system.
【作者单位】： 中国民航大学天津市智能信号与图像处理重点实验室;北京航空航天大学电子信息工程学院;
【基金】：国家自然科学基金(U1233117,61271404)
【分类号】：TN911.4
[Abstract]:Aiming at the problem that the L-band digital aeronautical communication system 1 (L-DACS1) is embedded in the aviation radio navigation frequency band, the range finder pulse interference (DME) quadrature frequency division multiplexing (DME) (OFDM) receiver is discussed. A method of pulse interference suppression for rangefinder combined with compression sensing and residual interference whitening is proposed. First, the receiver uses the empty subcarrier channel to observe the range finder pulse interference, and reconstructs the range finder pulse interference based on the convex optimization method with minimum constraints of L1 norm by using the sparse characteristic of the range finder pulse interference in time domain. Then the reconstructed pulse interference is converted to frequency domain for interference cancellation. Finally, the receiver converts the residual pulse interference into Gao Si white noise by signal deinterleaver and inverse orthogonal converter, which avoids the sudden demodulation error caused by the residual interference signal. The simulation results show that the combined interference suppression method can effectively eliminate the pulse signal interference of the rangefinder and improve the reliability of the link transmission in the L-DACS1 system.
【作者单位】： 中国民航大学天津市智能信号与图像处理重点实验室;北京航空航天大学电子信息工程学院;
【基金】：国家自然科学基金(U1233117,61271404)
【分类号】：TN911.4
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