基于Simulink的直扩系统频域窄带干扰抑制研究

直接序列扩频系统（Direct Sequence Spread Spectrum,DSSS）自身具有抗窄带干扰的能力,但当存在强窄带干扰时,需要有效的窄带干扰抑制技术来提高系统性能。研究了基于FFT的频域窄带干扰抑制算法,并对其中的加窗、重叠复用及门限生成等关键技术进行了分析。利用Matlab的可视化工具Simulink建立了仿真模型,并在给定的仿真条件下进行了仿真,验证了基于FFT重叠变换的频域陷波技术抑制干扰的有效性,为直接序列扩频系统在干扰环境下的应用提供了依据。

Analysis of Frequency Domain Narrow-band Interference Suppression in DSSS Based on Simulink

The direct sequence spread spectrum（ DSSS） system itself has the ability of resistance to narrowband interference,but when there are strong narrow-band interferences,the system need effectively suppression technology to improve the performance. This paper studies the frequency domain narrow band interference suppression algorithm based on FFT,and the key technologies of windowing,overlapped multiplexing and threshold generation are analyzed. The simulation model is established using Matlab visualization tool Simulink and simulation is made in the given simulation conditions. The results verify the effectiveness of the frequency domain notch interference suppression based on FFT lapped transform,which provides a basis for the application of DSSS system in interference environment.