高移动性的宽带无线通信会受到时频双选择性衰落的严重影响。信道估计的质量对于整个系统的性能具有重要的影响，尤其是当信道经历快速的衰落时。因此，高质量的双选信道估计是高速无线通信的必然要求。 -Broadband wireless communication will be affected by the high mobility of time-frequency doubly selective fading. The quality of channel estimation has an important influence on the performance of the whole system, especially when the channel is experiencing fast fading. Therefore, the high quality of the doubly selective channel estimation is a necessary requirement for high speed wireless communication.