基于FFT的均匀信道化滤波

摘要

Aimed at the bad filtering performance of the FFT channelization,the formula of the FFT filtering theory is derived.Based on the theory,how to unchain the fixed relationship between the FFT length and the low-pass prototype filter length is discussed by using the frequency domain decimation and adding zeros,so that high quality of the prototype filter can be achieved and the filtering quality of FFT improved.%针对基于快速傅里叶变换(FFT)的信道化滤波质量差的问题对FFT的滤波原理公式进行了推导,详细讨论了如何应用频域抽取和补零的方法解除FFT点数与低通原型滤波器长度之间的固定关系,从而能够设计出高性能的低通原型滤波器以进一步提高FFT的滤渡质量,最后通过仿真验证了方法的有效性.