Results show that the circle prefix which has arbitrary length can increase the quality of received eye diagram and improve the dispersion tolerance. The power equalization has been used to eliminate the performance differences of channels. 仿真结果表明,循环前缀的插入提高了眼图的性能、改善了色散容限;针对不同子载波进行功率均衡能够有效减小信道间的性能差异。