摘要
本文介绍了一种基于多相分解滤波器实现的zoom FFT算法 ,该算法是在复调制zoom FFT算法基础上 ,采用多相分解滤波器方法来实现低通滤波器 ,并利用多抽取频率系统的网络结构等效变换来减少运算量。分析表明 :这种基于多相分解滤波器实现的zoom FFT算法在保留了选带细化的灵活性基础上 ,其运算量仅约为常规复调制zoom FFT算法的 1 N2 (N2 为细化倍数 )。论文首先推导基于多相分解滤波器实现zoom FFT的算法 ,然后讨论该算法的实现方法 ,并与一些常用的zoom FFT算法进行比较 ,最后给出仿真结果。
A zoom FFT implementation based on polyphase decomposition is introduced.In this algorithm,which is based on complex modulation zoom FFT,the low pass filtering is implemented by polyphase filter,and the computation complexity is decreased by network architecture equivalent transform of multirate system.After analyzing,it is clear that the computation complexity of this zoom FFT implementationis only about 1/N2(N2 is the zoom times) of normal complex modulation zoom FFT,while reserve the flexibility of zoom band selection.In this paper,the algorithm of zoom FFT based on polyphase decomposition is deduced firstly and then the implementation of this algorithm is introduced with a compare with other zoom FFT algorithm.Finally the simulation result is given.
出处
《电子测量与仪器学报》
CSCD
2000年第3期26-31,共6页
Journal of Electronic Measurement and Instrumentation
