系统子载波数为64，调制方式为16-QAM，前缀长度为16，多径信道时延分别为0、8和20个采样点，各径功率相等。仿真比较OFDM系统空白前缀只考虑前2径信道和3径信道下的性能 -System subcarrier number is 64, modulation mode of 16 QAM, prefix length is 16, multipath channel delay is 0, 8 and 20 respectively sampling points, the diame