ACO-OFDM系统中抑制PAPR性能的PTS改进算法  

Improved PTS algorithm for PAPR reduction in ACO-OFDM system

作　　者：李超 静永健[2] LI Chao JING Yong-jian(Inner Mongolia Xinyuan Information Technology Limited Company, Hohehot 010000, China Center of Information and Network Technology, Inner Mongolia Agricultural University, Hohehot 010018, China)

机构地区：[1]内蒙古信源信息技术有限公司,内蒙古呼和浩特010000 [2]内蒙古农业大学信息与网络中心,内蒙古呼和浩特010018

出　　处：《计算机工程与设计》2016年第11期2893-2897,共5页Computer Engineering and Design

基　　金：国家自然科学基金项目(61462070);内蒙古科技计划基金项目(20130364)

摘　　要：非对称限幅光正交频分复用(ACO-OFDM)系统中基于传统部分传输序列(PTS)的峰均比(PAPR)抑制算法存在复杂度过高,需要传送边带信息的问题。在优化后的OFDM符号中直接插入边带信息会导致PAPR再升,带来传输速率损失。针对上述不足,提出一种基于阈值迭代的PTS改进算法。在搜索最优相位因子时,当PAPR小于给定阈值时,停止迭代降低计算复杂度。仿真结果表明,和传统PTS算法相比,PAPR抑制效果更好,复杂度更低,能在不降低传输速率的情形下同时传输边带信息。In the traditional peak-to-average power ratio（PAPR）reduction algorithm based on partial transmit sequence（PTS）,computational complexity is prohibitive and side information needs to be transmitted for asymmetrically clipped optical-orthogonal frequency division multiplexing（ACO-OFDM）system.The PAPR may be raised again when the side information is inserted directly into the optimized ACO-OFDM signal,which will decrease the data rate.Aiming at the above problems,an improved PTS algorithm based on threshold was proposed.This algorithm was terminated when the obtained PAPR was less than the given threshold at each process of searching the optimal phase factors to reduce complexity.Simulation results show that the proposed algorithm outperforms the traditional PTS method with lower complexity,and can achieve the same data rate while transmitting side information simultaneously.

关 键 词：可见光通信 非对称光正交频分复用 峰均比 部分传输序列 边带信息 

分 类 号：TP911.23[自动化与计算机技术]