电子学报 ›› 2000, Vol. 28 ›› Issue (1): 117-119.

• 论文 • 上一篇    下一篇

一种新的重叠变换域抗窄带干扰技术

李冲泥, 胡光锐   

  1. 上海交通大学电子工程系,上海 200030
  • 收稿日期:1998-10-13 修回日期:1999-01-05 出版日期:2000-01-25 发布日期:2000-01-25

A New Lapped Transform Domain Narrow-band Interference Excision Technique

LI Chong-ni,HU Guang-rui   

  1. Department of Electrical Engineering,Shanghai Jiaotong University,Shanghai 200030,China
  • Received:1998-10-13 Revised:1999-01-05 Online:2000-01-25 Published:2000-01-25

摘要: 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.

关键词: 重叠变换, 变换域处理, 中值滤波

Abstract: 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 interference.So LT domain MMF algorithm can completely mitigate the interference without distorting the desired signal.Simulation results demonstrate the improved BER performance and increased robustness of our receiver.

Key words: lapped transform, transform domain excision, median filter

中图分类号: