The time-frequencyplane of a standard OFDM system is a rectangular grid.
标准OFDM系统设计的时-频面为矩形网格。
2
It stems from the concept of instantaneous frequency, and it can describe accurately the local properties of dynamic data in the time-frequencyplane.
该方法源于瞬时频率的概念，它能把动态信号的局部特征正确地在时频域内予以描述。
3
The methods of time frequency analysis include linear, quadratic and adaptive methods. They provide effective tools for analyzing signal time varying spectrum in time frequencyplane.