OFDM信号限幅滤波的性能分析

OFDM是一种多载波调制技术,其特有的调制特性决定了它有较高的峰均功率比值PAPR（Peak-to-Average Power Ratio）。高峰均功率比信号会对实际放大器提出很高的线性要求,因此它是限制OFDM技术实用化的主要障碍。目前虽有很多降低OFDM信号的PAPR的方案,但大多是以增加系统的复杂程度为代价的。限幅滤波法是一种计算复杂度较小的算法。文中针对600Mb/s高速数传数据经4路子载波（每路150Mb/s）调制后的OFDM信号的PAPR进行了分析,并对限幅滤波法进行了仿真。

Analysis on Clipping and Filtering Performance of OFDM

OFDM, a Multi carrier modulating technique, holds a high PAPR（Peak-to-Average-PowerRatio） due to its special modulating characteristics. High PAPR signal limits the application of this technique in practice because of its requirement for strict linearity to the power amplifier. Although many schemes are reduce the PAPR, most of them are at the cost of increasing the system complexity. And clipping an proposed d filter is an algorithm with low computing complexity. Computer simulations indicate that the clipping and filtering to ing of the OFDM signal could reduce its PAPR.