基于FFT的直扩系统中窄带干扰抑制技术研究与实现  

Investigation and Implementation of Narrowband Interference Excision in DSSS System Based on FFT

作　　者：丁法珂[1] 

机构地区：[1]中国空空导弹研究院,洛阳471009

出　　处：《科学技术与工程》2009年第10期2739-2742,共4页Science Technology and Engineering

摘　　要：针对直接序列扩频系统中窄带干扰问题,介绍了基于FFT的干扰抑制算法。根据直接序列扩频信号与窄带干扰信号在频域能量分布不同这一特性,利用快速傅立叶变换实现窄带干扰信号的实时检测和抑制。采用VHDL硬件描述语言对算法进行基于FPGA实现的可综合的描述。最后在硬件测试平台上进行性能测试,结果表明设计能有效抑制直接序列扩频系统中的窄带干扰。To overcome the narrowband interference in the DSSS system, an anti-interference algorithm based on FFT is introduced. The narrowband interference is detected and suppressed by FFT based on its power distribution difference between that and the DSSS signal in frequency domain. And the synthesizable algorithm is imple- mented by VHDL to achieve in the FPGA. The performance, which is tested in the hardware platform, shows that effective suppression to the narrowband interference can be obtained in the DSSS system by the design

关 键 词：直序扩频系统 窄带干扰 快捷傅立叶变换(Fast Trans formee de Fourier FFT) 现场可编程门阵列(Feild Programmable Gate Array FPGA) 

分 类 号：TN914.42[电子电信—通信与信息系统]