In this paper, an one to one maping is used to transfer an arbitrary domain and a nonuniform grid on it in physical plane to a rectangular domain with a uniform grid in computational plane.
采用坐标变换方法，将物理平面中任意几何区域上的非均匀网格剖分映射到计算平面中规则区域上的均匀网格剖分。
The time-frequency plane 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。
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