| 重叠FFT频域窄带干扰抑制的改进方法 |
| |
| 引用本文： | 罗武,王伟平,董明科,梁庆林. 重叠FFT频域窄带干扰抑制的改进方法[J]. 高技术通讯, 2007, 17(2): 120-123 |
| |
| 作者姓名： | 罗武 王伟平 董明科 梁庆林 |
| |
| 作者单位： | 北京大学信息科学技术学院,北京,100871 |
| |
| 基金项目： | 国家高技术研究发展计划(863计划) |
| |
| 摘 要： | 为了克服基于FFT(Fast Fourier Transform)的频域干扰抑制算法通常采用数据加窗以降低频谱泄漏而引起扩频信号失真和信噪比损耗,提出了一种重叠加窗频域干扰抑制改进方法.该方法的特点是能实现信号的完全重构,避免加窗处理引起PN码相关特性的改变.理论分析和仿真结果验证了算法的有效性.仿真结果表明,该方法能有效消除加窗引起的频谱失真和信噪比损失,降低误码率,并适用于多种类型的窗函数.该方法的代价是增加了少量复数运算.
|
| 关 键 词： | 扩频通信 干扰抑制 快速傅立叶变换(FFT) 重叠相加 |
| 收稿时间： | 2005-12-30 |
| 修稿时间： | 2005-12-30 |
An improved narrow-band interference suppression algorithm for spread spectrum systems using lapped FFT |
| |
| Luo Wu,Wang Weiping,Dong Mingke,Liang Qinglin. An improved narrow-band interference suppression algorithm for spread spectrum systems using lapped FFT[J]. High Technology Letters, 2007, 17(2): 120-123 |
| |
| Authors: | Luo Wu Wang Weiping Dong Mingke Liang Qinglin |
| |
| Affiliation: | School of Electronics Engineering and Computer Science, Peking University, Beijing 100871 |
| |
| Abstract: | In this paper, an improved lapped FFT algorithm is used to transform the received data signals to the frequency-domain wherein adaptive excision is performed. First, the algorithm can perform perfect reconstruction for the received signals, avoiding correlation property of the PN sequence changed by windowing. Theoretical results show that it can completely eliminate both the spread spectrum signals distortion and BER degradation due to windowing. Furthermore, it is valid for a broad class of windowing function while a few more complex operations are needed. Theoretical results are confirmed by coraputer simulation. |
| |
| Keywords: | spread spectrum communications interference suppression Fast Fourier Transform (FFT) overlap-and-add |
| 本文献已被 CNKI 维普 万方数据 等数据库收录！ |
|
