利用Zadoff-Chu序列降低DCO-OFDM可见光系统的峰均比  

Reducing PAPR of DCO-OFDM Visible Light System Using Zadoff-Chu Sequence

作　　者：燕慧英[1] 高雅[1] YAN Huiying;GAO Ya(College of Physics and Electronic Information,Luoyang Normal University,Luoyang 471934,China)

机构地区：[1]洛阳师范学院物理与电子信息学院,河南洛阳471934

出　　处：《东莞理工学院学报》2020年第5期20-24,共5页Journal of Dongguan University of Technology

基　　金：河南省高等学校重点科研项目计划支持(17A510013)。

摘　　要：为了降低直流偏置光正交频分复用(DCO-OFDM)可见光系统具有的高峰均比,对传统的部分传输序列(PTS)算法进行了改进,提出了基于Zadoff-Chu序列的PST改进算法。该算法的基本思路是先利用Zadoff-Chu序列构建一个正交的预编码矩阵,然后根据传统的PTS算法将DCO-OFDM信号分割成互不相交的子块,接着将各个子块与预编码矩阵相乘,通过降低每个子块的自相关性达到降低DCO-OFDM可见光系统峰均比的目的。仿真结果表明,基于Zadoff-Chu序列的PTS改进算法明显降低了DCO-OFDM可见光系统的峰均比,达到了预期的效果。In order to reduce the high peak-to-average ratio(PAPR)in the direct current biased optical orthogonal frequency division multiplexing(DCO-OFDM)visible light system,the traditional partial transmission sequence(PTS)algorithm is improved,and the PST improved algorithm based on the Zadoff-Chu sequence is proposed.The basic idea of the algorithm is to construct an orthogonal pre-coding matrix by using the Zadoff-Chu sequence,then divide the DCO-OFDM signals into non-intersecting subblocks according to the traditional PTS algorithm,then multiply each sub-block with the pre-coding matrix,and the PAPR of the DCO-OFDM visible light system can be reduced by reducing the autocorrelation of each sub-block.The simulation results show that the PTS improved algorithm based on the Zadoff-Chu sequence can reduce the PAPR of the DCO-OFDM visible light system obviously and achieve the expected effect.

关 键 词：峰均比 部分传输序列:Zadoff-Chu序列 

分 类 号：TN919.3[电子电信—通信与信息系统]