基于时频加窗短时傅里叶变换的LFM干扰抑制  

LFM Interference Suppression Using Time-Frequency Windowed Short-Time Fourier Transform

作　　者：张玉恒[1] 吴启晖[1] 王金龙[1] 

机构地区：[1]解放军理工大学通信工程学院,南京210007

出　　处：《电子与信息学报》2007年第6期1361-1364,共4页Journal of Electronics & Information Technology

摘　　要：通过对线性调频(LFM)信号分数阶傅里叶变换的分析,该文提出了一种基于时频加窗短时傅里叶变换(TFW-STFT)的LFM干扰抑制算法。由于提出的时频窗对LFM干扰具有较好的频域能量聚集性能,因此TFW-STFT对信号的影响要小于无聚集性能的短时傅里叶变换。仿真结果证明该算法在信噪比损失和系统误比特率上明显优于基于短时傅里叶变换的算法。Through the analysis of fractional Fourier transform of the Linear Frequency Modulation （LFM） signal, a LFM interference suppression algorithm using Time-Frequency Windowed-Short Time Fourier Transform （TFW-STFT） is proposed. Because the energy of LFM interference can be concentrated into a very narrow band in frequency domain by the time-frequency window, the impact made on the signal by TFW-STFT is lighter than the STFT. Simulation results show that the SNR loss and the BER performance of the proposed algorithm are evidently better than the STFT algorithm.

关 键 词：干扰抑制 时频窗 短时傅里叶变换 

分 类 号：TN911.4[电子电信—通信与信息系统]