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基于伪随机噪声序列相干光正交频分复用系统的定时同步算法

Timing Synchronization Algorithm for Coherent Optical Orthogonal Frequency Division Multiplexing System Based on Pseudo Noise Sequence

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摘要

针对传统定时同步算法的副峰干扰和低信噪比(SNR)下定时不稳定的问题, 提出了一种基于伪随机噪声(PN)序列的定时同步算法。根据PN序列良好的延迟相关性和对称相关性, 重新设计了训练序列的结构, 并优化了定时度量函数的计算方法。仿真结果表明, 改进算法的定时度量估计曲线只存在一个峰值, 消除了副峰干扰。在循环前缀为四分之一符号长度与低SNR的情况下, 仍可实现准确和稳定的定时。

Abstract

A timing synchronization algorithm based on a pseudo-noise (PN) sequence is proposed aiming at the problems of sub-peak interference and timing instability at low signal-to-noise ratio (SNR) in the traditional timing synchronization algorithms. The structure of the training sequence is reconstructed and the calculation method of the timing measurement function is optimized by utilizing the good delay correlation and symmetric correlation of the PN sequence. The simulation results show that only one peak can be seen in the timing metric estimation curve and the sub-peaks are suppressed by using the proposed algorithm. The algorithm can realize accurate and stable timing synchronization, even when the length of the cyclic prefix is a quarter of the symbol length and the SNR is low.

Newport宣传-MKS新实验室计划
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中图分类号:TN913.7

DOI:10.3788/aos201939.0506001

所属栏目:光纤光学与光通信

基金项目:天津市自然科学基金(15JCYBJC17000)、河北省教育厅基金重点项目(ZD2017021)

收稿日期:2018-11-19

修改稿日期:2018-11-30

网络出版日期:2018-12-29

作者单位    点击查看

吴雪琪:河北工业大学电子信息工程学院, 天津 300401天津市电子材料与器件重点实验室, 天津 300401
刘剑飞:河北工业大学电子信息工程学院, 天津 300401天津市电子材料与器件重点实验室, 天津 300401
曾祥烨:河北工业大学电子信息工程学院, 天津 300401天津市电子材料与器件重点实验室, 天津 300401
卢嘉:河北工业大学电子信息工程学院, 天津 300401天津市电子材料与器件重点实验室, 天津 300401
许彦朋:河北工业大学电子信息工程学院, 天津 300401天津市电子材料与器件重点实验室, 天津 300401

联系人作者:刘剑飞(jfliu@hebut.edu.cn)

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引用该论文

Wu Xueqi,Liu Jianfei,Zeng Xiangye,Lu Jia,Xu Yanpeng. Timing Synchronization Algorithm for Coherent Optical Orthogonal Frequency Division Multiplexing System Based on Pseudo Noise Sequence[J]. Acta Optica Sinica, 2019, 39(5): 0506001

吴雪琪,刘剑飞,曾祥烨,卢嘉,许彦朋. 基于伪随机噪声序列相干光正交频分复用系统的定时同步算法[J]. 光学学报, 2019, 39(5): 0506001

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