The channel is time variant when the velocity of the terminal is high.
在终端移动的条件下,信道是时变的,而且会产生多普勒频移。
参考来源 - 点对点无线收发器基带算法的研究与实现·2,447,543篇论文数据，部分数据来源于NoteExpress
A new method for the design of linear time-variant recursive digital filters is proposed in this paper.
提出了设计线性时变递归数字滤波器的一种新方法。
For integer ratio conversion, the filters would be time-invariant, but for fractional ratio conversion, the filters would be time-variant whose structure is more complex.
实现整数倍采样率转换可以采用时不变滤波器，然而实现分数倍采样率转换一般需要采用较复杂的时变滤波器。
Even though line drawings are extracted from a complex polyhedron with time-variant movement, only the simple circuit is used for arriving at a rapid matching computation.
即使对作时变运动的复杂多面体的线图，亦只需使用简单回路便可进行快速匹配计算。
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