基于OFDM的POF通信PAPR抑制研究

PARP Restraint in POF Communications based on OFDM

在基于OFDM调制技术的塑料光纤通信系统中,发送信号的峰值平均功率比(PAPR)过高将会影响到系统的通信质量。通过比较已有的几种降低OFDM信号PAPR值的方法,文中提出了一种冲激整形技术方法,对输入的数据进行线性变换,改变了原始数据相位和幅度的分布,降低PAPR值,并给出了如何使用改进的奈奎斯特脉冲来调制各个子载波的时域脉冲波形。仿真结果表明:该方法计算复杂度低,运行效率高,并能够有效降低OFDM信号的PAPR值。

In POF communication system based on OFDM,high peak-to-average power ratio（PAPR） has direct impacts on the quality of communications.By comparison of certain existing methods in PAPR reduction,this paper proposes a method based on pulse-shape,describes how to use the improved Nyquist pulse for modulating time-limited waveforms of the different subcarriers.The input pulse-shape data is linearly transformed,and the distribution of original-data phase and amplitude is changed,thus to reduce the PAPR value of OFDM signals.Simulation result shows that the proposed method could remarkably reduce the PAPR of OFDM signals,and is of low complexity and high efficiency.