一种新的重叠变换域抗窄带干扰技术

A New Lapped Transform Domain Narrow-band Interference Excision Technique

本文采用改进的重叠变换域中值滤波算法进行变换域抗干扰处理．该算法既考虑到直接序列扩频信号的特点，同时又利用重叠变换的特性对变换域系数进行了二次滤波．该算法节省处理时间，并且不需要有关干扰的先验知识，系统性能不会随干扰频率变化而变化，因而是一种很稳健的处理方法．

A novel communication receiver which uses lapped transform (LT) incorporating modified median filter (MMF) algorithm is designed for narrow-band interference excision. The LT domain MMF algorithm takes full advantages of the direct sequence spread spectrum signal ,as well as the characteristics of LT , performing the transform domain filtering twice the first filtering locates the position of interference and mitigates most of them.the Second filtering is performed in a small neighborhood of the located inter- ference. so LT domain MMF algorithm can completely mitigate the interference without distorting the distorting the desired signal ,Simulation results demonstrate the improved BER performance and increased robustness of our receiver.