中文说明：应用背景在分析基于滤波器组的OFDM系统时候，要对滤波器组的时频特性进行一个分析，这就需要用来该分析程序。研究常见的高斯、IOTA和EGF等滤波器,经常的研究包括与CP-OFDM系统中的矩形窗函数进行对比分析。 关键技术从抗 ISI 和 ICI 的角度讲,总是希望能量集中在时频格点附近,而扩散到其它格点的能量越小越好。TFL 正是描述这一特性的最直接方法。从滤波器的角度看,TFL 特性描述了两个滤波器之间的相关性。描述 TFL 特性的方法包括 TFL 函数和TFL 参数两大类。TFL 函数又包含瞬时相关函数、模糊函数和干扰函数,而 TFL参数包括 Heisenberg 参数和方向参数(direction parameter, DP)
English Description：
Application backgroundIn the analysis of the OFDM system based on the filter bank, the time frequency characteristic of the filter bank is analyzed, and the program is needed. Studies of the common Gauss, IOTA and EGF filter, and the regular study of the CP-OFDM system, including the rectangular window function to carry out a comparative analysis.Key TechnologyFrom the point of view of anti ISI and ICI, it is always the hope that the energy is concentrated near the point of time and the energy of the other grid points is smaller. TFL is the most direct way to describe this characteristic. From the point of view of the filter, the correlation between the two filters is described by the TFL property. Methods for describing the characteristics of TFL include two classes of TFL functions and TFL parameters. The TFL function contains the instantaneous correlation function, the ambiguity function and the interference function, and the TFL parameters