不同叠加训练序列PTS降低PAPR性能比较

摘要

部分传输序列(PTS)能有效降低正交频分复用(OFDM)系统的峰均功率比(PAPR),但是其存在降低性能有限和边带信息占用频谱资源的问题。文中在传统PTS方法的基础上,基于叠加训练序列PTS降低PAPR的方法,分析了叠加不同训练序列、不同训练序列作相位旋转因子及功率分配因子对降低PAPR性能的影响。仿真结果表明：叠加自相关性较好的训练序列,降低PAPR的能力更强；不同训练序列作相位旋转因子时,对降低PAPR的效果影响不大；采用Hadama码、功率分配因子大于0.15时,降低PAPR的能力增强。该方法中的训练序列,不仅可以用于同步﹑信道估计,而且可以降低PAPR,并提高系统频谱利用率。%Partial Transmit Sequences ( PTS) is an efficient scheme for Peak-to-Average Power Ratio ( PAPR) reduction in Orthogonal Frequency Division Multiplexing ( OFDM) system,but the performance of reduction is limited and the sideband information occupied the spectrum resources. Based on the traditional PTS method and the method of superimposed training PTS,the performance of PAPR reduc-tion from the superposition of different training sequences and the different training sequences for phase rotation factors and power alloca-tion factor is analyzed. The simulation results show that the better autocorrelation superimposed training sequence has the better capacity of PAPR reduction,different training sequences for phase rotation factor has little effect on PAPR reduction,and when using Hadama code and the power allocation factor is greater than 0. 15,the ability of PAPR reduction is enhanced. In this scheme,the training sequences can not only use for synchronization and channel estimation,but also promote the band efficiency and PAPR reduction ability of the system.