标题： 抗干扰调制用于受到干扰攻击的OFDM系统 显示英文标题

标题： Anti-Jamming Modulation for OFDM Systems under Jamming Attacks

摘要： 在本文中，我们提出了一种抗干扰通信框架，用于在干扰攻击下的正交频分复用（OFDM）系统。 为此，我们首先开发了一种抗干扰调制方案，该方案使用扩展矩阵将每个符号分布在多个子载波上，从而提高对干扰的鲁棒性。 为了在接收端进行最优解调，我们设计了一种最大似然检测（MLD）方法及其低复杂度变体，专门针对已知干扰方差情况下的我们的抗干扰调制方案。 我们分析了我们调制方案的比特错误率（BER），并根据干扰场景优化其调制阶数。 为了适应动态和未知的干扰环境，我们提出了一种干扰自适应通信框架，包括两个阶段：（i）干扰非相干阶段和（ii）干扰相干阶段。 在干扰非相干阶段，我们开发了一种近似MLD方法，在无需先验干扰方差知识的情况下运行，并能够估计干扰参数。 在干扰相干阶段，我们利用这些估计的参数来优化所提出的调制方案，同时采用低复杂度的MLD方法。 仿真结果表明，与现有OFDM通信框架相比，所提出的抗干扰框架在广泛的通信和干扰场景中表现出优越的BER性能。 显示英文摘要

摘要： In this paper, we propose an anti-jamming communication framework for orthogonal frequency-division multiplexing (OFDM) systems under jamming attacks. To this end, we first develop an anti-jamming modulation scheme that uses a spreading matrix to distribute each symbol across multiple subcarriers, enhancing robustness against jamming. For optimal demodulation at a receiver, we devise a maximum likelihood detection (MLD) method and its low-complexity variant tailored to our anti-jamming modulation scheme in scenarios with known jamming variance. We analyze the bit error rate (BER) of our modulation scheme to optimize its modulation order according to a jamming scenario. To adapt to dynamic and unknown jamming environments, we present a jamming-adaptive communication framework consisting of two phases: (i) a jamming-noncoherent phase and (ii) a jamming-coherent phase. In the jamming-noncoherent phase, we develop an approximate MLD method that operates without prior knowledge of jamming variance and enables the estimation of jamming parameters. In the jamming-coherent phase, we use these estimated parameters to optimize the proposed modulation scheme while employing the low-complexity MLD method. Simulation results demonstrate the superior BER performance of the proposed anti-jamming framework compared to existing OFDM communication frameworks across a wide range of communication and jamming scenarios.