摘要
提出一种直接序列扩频(DSSS)系统中基于Chirp-Fourier变换的扫频干扰(LFM)抑制算法,Chirp-Fourier变换可以有效地估计出加入噪声的LFM的初始频率和扫频率,从而可以设计出自适应的干扰抑制接收机。仿真分析表明,该方法可获得较好的误码率性能,和其它基于二维时频分析工具的滤波算法相比,不仅干扰抑制的效果好,而且可利用快速傅里叶变换(FFT)实现,提高了处理速度。
An algorithm for suppressing the frequency sweeping interference in Direct Sequence Spread Spectrum(DSSS) system using Chirp-Fourier transform is proposed. Chirp-Fourier transform is used as an effective technique for the detection and parameter estimation of chirp signals, and a DSSS receiver with adaptive time-varying filter is presented. The simulations show that remarkable improvement in Bit Error Rate is obtained, and compared with other two-dimensional time-frequency interference suppressing algorithms, it is better in the interference suppressing, and easier in implementation.
出处
《电讯技术》
北大核心
2004年第4期34-38,共5页
Telecommunication Engineering
基金
河南省自然科学基金资助项目(2000510002)
关键词
扩频通信
直接序列扩频
Chirp-Fourier变换
干扰抑制接收机
算法
Spread spectrum communication
Direct sequence spread spectrum(DSSS)
Chirp-Fourier transform
Interference suppressing receiver
Algorithm
