针对正交频分复用系统中峰值平均功率比过高的问题，提出了一种基于限幅技术的改进算法.该算法对限幅后的信号进行标记，并将标记序列发送到接收端，从而使得接收端能够正确的解调出输入信号.此外，本文还将该改进算法应用于光载无线通信系统中.仿真结果表明，与传统限幅算法相比，改进算法能够明显降低系统的误码率，同时保证良好的抑制峰均比的性能.

In order to reduce the PeaktoAverage Power Ratio (PAPR) of Orthogonal Frequency Division Multiplexing (OFDM), a restorable Clipping scheme is proposed and used in the OFDM and Radio Over Fiber (OFDMROF) system. The algorithm is to set a peak detection threshold on the input signals and the signals can be recorded in an array, at the receiving end, the original siginal can be restored in the array effectively. Simulation results show that the new scheme is not only simple, but also significantly improve the BER and the outofband radiation performance while guaranteeing the PAPR performance of the QAMOFDM system.