为了降低OFDM系统的高峰值功率比(PAPR), 提出了一种基于DFT扩频内插子载波选择性映射的OFDM传输方案。根据DFT扩频特有的降低PAPR特性, 以及子载波映射对PAPR的重要影响, 提出一种可选择的映射方式应用到DFT扩频系统中。通过搭建仿真系统得出, 基于DFT扩频的选择性映射内插子载波OFDM系统的PAPR比传统OFDM系统的PAPR低0.5~2dB, 系统Q值比常规DFT扩频OFDM系统高1, 是一种降低OFDM系统PAPR的理想设计方案。

To reduce the peak-to-average power ratio (PAPR) of OFDM system, an interleaved subcarrier selective mapping design pattern based on DFT spread was proposed. Because DFT spread can reduce OFDM systems PAPR and subcarrier mapping can influence the PAPR, so interleaved subcarrier selective mapping was proposed for DFT spread system. Simulation results show that, the proposed system with interleaved subcarrier selective mapping can reduce the PAPR by 0.5～2dB compared with traditional OFEM system, but the Q value is 1 higher. It is proved that interleaved subcarrier selective mapping is a good design pattern for OFDM system.