School;
of;
Electronic;
Information,;
Wuhan;
University,;
Wuhan;
430079,;
China;
National;
Laboratory;
for;
Information;
Engineering;
in;
Surveying,;
Mapping;
and;
Remote;
Sensing,;
Wuhan;
University,;
Wuhan;
430079,;
China;
信道估计算法; LEO; 正交频分复用系统; OFDM; 卫星通信;