正交频分复用系统中抗线性调频干扰算法研究

LFM interference suppression in OFDM systems

摘要: 针对基于离散傅立叶变换的正交频分复用系统（OFDM），提出了一种新的线性调频（LFM）干扰抑制算法。该算法分为两部分：干扰估计和干扰重构抑制。干扰估计时，首先采用离散傅立叶变换进行粗略估计，然后采用离散匹配傅立叶变换进行精确估计，整个过程均可共用傅立叶变换单元，有效地节省了系统资源。实验结果表明：该算法的干扰抑制性能良好；与现有的抗线性调频干扰算法相比，其运算复杂度大为降低，具有很好的工程实用性。

Abstract: A new algorithm for suppression linear frequency modulation (LFM) interference is proposed in orthogonal frequency division multiplexing (OFDM) system. The algorithm includes estimation of interference signal and suppression after reconstruction of the signal. At the process of estimation, the whole operation use the DFT cells in OFDM system. The result shows that the algorithm has a good performance, and compared with other methods, it greatly reduces the complexity of OFDM systems.