抑制OFDM系统PAPR的PTS算法改进

Improved PTS for PAPR Reduction in OFDM System

部分传输序列(PTS)是一种降低OFDM信号的峰值平均功率比(PAPR)的有效方法。PTS采用是在子序列中添加旋转相位因子[0,2π)。通过对OFDM信号相位分布情况进行研究,本文提出一种改进的PTS方法。改进点在其相位旋转因子的选择上,采用每个子块乘以非均匀分布的旋转因子。

Partial transmit sequence （PTS） is one of the effective and uncomplicated PAPR reduction methods for OFDM systems. The phase factors applied in the weighting sequences are assumed to be uniformly distributed within [0,2 π ）. By carefully investigating the phase distribution of OFDM signals, we proposed a modified PTS scheme outperforming the conventional PTS scheme in PAPR reduction performance. The process of the proposed scheme is the same as the conventional PTS, except for applying the new non-uniform phase factors. The required side information is the same as the conventional PTS applying uniform phase factors.