Based on the cyclic prefix property of the guard intervals, it provides estimates for sampling positions of ISI-free region by combining the techniques of delay conjugate multiplication, phase difference, symbol-by-symbol average, and edge detection.

• 以护卫区间循环前置的特性为基础，结合延迟共轭相乘、相位差分、符元对符元之区段式平均以及边界侦测等技术来估计非码际干扰区间的位置。