解决频域干扰处理法能量泄露问题的方法研究

针对频域干扰处理法对窄带干扰进行处理时存在严重的能量泄露现象导致其对干扰的抑制能力大幅下降的问题研究对其的解决方案,采用时域和频域相结合的分析方法深入剖析能量泄露现象,以及加窗后有用信号的损失情况,在这个基础上利用加窗后进行重叠相加的方法同时完成对干扰能量泄漏现象的抑制和对有用信号的重构。仿真表明,这种方案可以大幅度地提高频域干扰处理法的干扰抑制效果。

Solution of Spectrum Energy Leakage in Frequency-domain Interference Excision Algorithm based on FFT

This paper focus on the method to solve the spectrum energy leakage caused by FFT computation error while suppressing the narrowband interference in DSSS systems.The reason for the spectrum leakage and the loss for particular windowing are analyzed in both the time domain and frequency domain.Based on this,a windowed lapped FFT method is introduced to fix the loss of the window function while keep little interference energy leakage.Simulations indicate that this scheme could greatly raise the performance of narrowband interference excision in frequency domain when the windowed lapped FFT is employed.