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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.
Aiming at the problem of DME Orthogonal Frequency Division Multiplexing (OFDM) receivers generated by L-band Digital Aeronautical Communication System 1 (L-DACS1) embedded in the aeronautical radionavigation band in an embedded manner, a joint compression Perception and residual interference whitening of the rangefinder pulse interference suppression method.First, the receiver through the empty subcarrier channel to observe the rangefinder pulse interference, and the use of rangefinder pulse interference sparse characteristics in the time domain, based on l1 norm minimization constraints Then the reconstructed pulse interference is transformed to the frequency domain for interference cancellation. Finally, the receiver transforms the residual impulse interference into Gauss by the signal de-interleaver and the inverse orthogonal transformer White noise to avoid sudden demodulation error caused by residual interference signal.The simulation study shows that the joint interference suppression method can effectively eliminate the interference of the pulse signal of the range finder and significantly improve the reliability of the link transmission in the L-DACS1 system.