| 摘要: |
| 为了增强扩频系统的窄带干扰抑制能力,针对重叠域中值滤波(MF)算法会给信号带来失真的缺点,提出一种基于重叠变换域窄带干扰抑制算法.该算法基于直接序列扩频信号在重叠变换域的特点,利用阈值滤波、中值滤波、估计门限进行综合判决.仿真表明:该算法能有效降低信号干扰能量,同时减少中值滤波算法对信号造成的失真,增强了系统性能和鲁棒性. |
| 关键词: 扩频通信 重叠变换 变换域处理 中值滤波 |
| DOI：10.3969/j.issn.1001-893X. |
| 投稿时间：2006-04-25修订日期：2006-09-10 |
| 基金项目:电子科技大学抗干扰重点实验基金 |
|
| An Algorithm for Narrow-Band Interference Excision in Lapped Transforms Domain |
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| Abstract: |
| In order to further mitigate the great narrow-band interference(NBI) in direct sequence spread spectrum(DSSS) communication systems,a new algorithm is proposed to suppress NBI in lapped transforms (LT) domain.The big jamming coefficients are removed by the gross threshold at first.And then,the Median Filter(MF) algorithm is used to remove the residual jamming coefficients in LT domain.To compare both of them to decide whether the coefficients by the gross threshold are replaced by the coefficients or by the MF,to reduce the distortion of the useful information.The results demonstrate that the proposed algorithm is far reduce the jam energy,and also improves the system performance and increases robustness. |
| Key words: spread spectrum communications lapped transform transform domain excision median filter |
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