余弦窗DFT递推算法

Recursive DFT with poly-cosine window

本文分析了ＤＦＴ递推算法的窗谱特性及其对信号频谱精度的影响，给出了余弦窗ＤＦＴ递推算法及其实现方法，介绍了算法的初始化方法及局部频域的频谱分析算法，分析了算法的复杂性并进行了仿真分析。

In this paper, the analysis of the spectrum of the rectangle window function in presented recursive DFT and its effect on the precision of the signal spectrum are made, the recursive DFT with poly-cosine window and its implementation, esecially the initialization of the arithmetic and the computation in part frequency area are presented, the simulation and the discussion about the arithmetic complexity are made.