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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 the plastic optical fiber communication system based on OFDM modulation technology, the peak PAPR of the transmitted signal is too high, which will affect the communication quality of the system. By comparing the existing methods to reduce the PAPR of OFDM signals, an impulse shaping technique is proposed to transform the input data linearly, change the phase and amplitude distribution of the original data, reduce the PAPR and give How to use the improved Nyquist pulses to modulate the time-domain pulse shape of each subcarrier. Simulation results show that this method has low computational complexity and high operation efficiency, and can effectively reduce the PAPR of OFDM signals.