直扩系统中白化滤波器的研究

Development of Albefaction Filter in Orthomode Spread Spectrum System

针对直扩系统对强窄带干扰的抗干扰能力弱的缺陷,提出了采用白化自适应滤波器来跟踪并消除强窄带干扰的新方法。对双向抽头滤波器和预测误差滤波器这两种自适应滤波器的特性进行了分析,并在计算机上进行了数值仿真。仿真结果表明,加白化滤波器确实能提高系统的抗强窄带干扰的能力,同时也表明双向抽头滤波器的抗干扰性能比预测误差横向滤波器的性能要好。

In consideration of defects of weak anti-interference ability of strong-narrow band in an orthomode spread spectrum system,it is proposed that an ablefaction auto-adated filter, which is a new method,is used to trace and avoid the interference from the strong-narrow band. The characteristics of dual tap filter and predicted error filter are analyzed, which are auto-adapted filters, and a numerical simulation is performed on computer. The result shows that the ability of anti-interference from strong-narrow band can be improved by using albefaction filter, the interference resisting property of the dual tap filter is much better than that of predicted error filter.