PTS-OFDM系统边带信息替代技术研究

Research on a Side Information Substitute Technique in the PTS-OFDM System

本文提出在PTS-OFDM系统分组子载波中加入相位辨识码元序列,替代传统PTS算法中的边带信息。本文分析了OFDM系统信道非线性对系统性能的影响,研究了抑制峰均功率比的PTS算法及其边带信息传输特点,进而提出在各分割子块中插入一组相位辨识编码替代边带信息,提供最优相位权值,达到不需边带辅助信息降低峰均功率比的目的。仿真表明,新算法虽有少量传输效率损失,但可以改善系统峰均功率比,提高系统传输的可靠性,减少对频带资源的占用。

Phase identification coding sequences were proposed to be added into grouped sub-carries in this paper,thus to cancel side information in a PTS-OFDM system. On the other hand, the effects on the system performances caused by the channel nonlinear character have been analyzed and partial transmit sequence （PTS） algorithm as well as its side information （SI） to reduce peak-to-aver- age power ratio （PAPR） in multi-carrier system were also been investigated in this paper,too. An new method is proposed which is to insert phase identification codes into every partitioned sub-blocks to substitute traditional SI and provide optimum phase weights. New proposed method improved PAPR performance and none of SI needed to be transmitted by special channel. A simulation experiment shows that though a small transmission efficiency drop occurs, the inserted phase identification codes reduced PAPR, enhanced the relia- bility of transmission in such a system and saved the frequency resource.