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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。
In order to solve the problem that broadband air data links work in the DME channels in an in-line manner and transmit the pulse signal from the rangefinder to interfere with the wideband air data link orthogonal frequency division multiplexing (OFDM) receiver, a Joint orthogonal transformation and signal interleaving OFDM transmission method. First of all, this method uses the characteristics of the rangefinder pulse signal in the frequency domain as a strong correlated Gaussian pulse. By means of the orthogonal transform of the transmitter and the signal interleaver, the receiver deinterleaver and the inverse orthogonal transformer are used to convert the strong correlation pulse As non-correlated pulses; then, non-correlated random pulses are iteratively reconstructed based on the expectation maximization (EM) algorithm; and finally, the impulse interference suppression is suppressed by the frequency domain. The simulation results show that the proposed OFDM transmission method combining joint orthogonal transform and signal interleaving can effectively suppress the impulse interference of the range finder and significantly improve the reliability of the OFDM receiver link transmission.