基于全相位的自适应数字滤波器设计方法

Design method of the self-adaptable digital filter based on all phase

针对通常情况下滤波器引起的相移问题,概述零相位数字滤波的重要意义。并在介绍传统零相位数字滤波器设计(FRR和RRF)原理和方法的基础上,提出了一种新的零相位数字滤波器的设计原理和方法——全相位方法。通过仿真实验将传统的设计方法与此新设计方法给予了验证,使数字信号处理中滤波器引起的相位失真问题得到很好的解决。说明全相位方法是一种很好的零相位数字滤波器的设计方法,全相位数字滤波器它具有良好的滤波频率特性,适用于频谱分析,多路复用和扩品通信中窄带干扰抑制等频域自适应滤波器。并且将全相位法应用于自适应滤波器。

.. Aiming at the problem of phase error caused by normal filters in signal processing,this paper summarizes the important meaning of digital filtering with zero-phase error,and introduces the all phase method as a new design method of digital filter with zero-phase based on the two traditional methods, that is FRR and RRF methods. And gives the demonstrations on the simulation experiments about the three methods, solving the problem of phase error in digital signal processing. It points out that all phase method is a good method of designing zero-phase digital filter, and the digital filter based on all phase have good frequency performance, whereas it is suited for the design of frequency domain adaptive filter. Which can be applied to lots of fields such as frequency analysis, multiplex and suppressing narrow-band interference in PN spread--spectrum systerms.