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基于恒幅零自相关序列的相干光正交频分复用系统定时同步算法

Timing Synchronization Algorithm of Coherent Optical Orthogonal Frequency Division Multiplexing System Based on Constant Amplitude Zero Auto-Correlation Sequences
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摘要 提出了一种基于恒幅零自相关(CAZAC)序列的定时同步算法。该算法的CAZAC训练序列由4部分构成,分为6个定时窗口,利用序列的共轭对称和偶对称特性进行相关运算,通过6个窗口相乘得到定时度量函数。仿真结果表明,利用所提算法可获得具有唯一脉冲状峰值的定时度量函数曲线,消除了定时平台以及旁瓣干扰。同时,在信噪比和色散较大的变化范围内,所提算法仍具有较好的定时稳定性。 A novel timing synchronization algorithm is proposed based on constant amplitude zero auto-correlation(CAZAC) sequence.In the proposed algorithm,the training sequence consists of four CAZAC sequences,which are divided into six timing windows.The correlation operation is carried out by use of the characteristics of conjugate symmetry and even symmetry of the sequences,and the timing metric function is obtained by multiplying these six timing windows.The simulation results show that the proposed algorithm can be used to obtain the timing metric function curve with the unique pulse peak and eliminate the disturbance of timing plateaus and side lobes.Meanwhile,the proposed algorithm has good timing stability within a large range of optical signal-to-noise ratio and chromatic dispersion.
作者 许彦朋 刘剑飞 曾祥烨 卢嘉 吴雪琪 Xu Yanpeng;Liu Jianfei;Zeng Xiangye;Lu Jia;Wu Xueqi(School of Electronic and Information Engineering,Hebei University of Technology,Tianjin 300401,China;Tianjin Key Laboratory of Electronic Materials and Devices,Tianjin 300401,China)
出处 《中国激光》 EI CAS CSCD 北大核心 2019年第4期265-270,共6页 Chinese Journal of Lasers
基金 天津市自然科学基金(15JCYBJC17000) 河北省教育厅基金重点项目(ZD2017021).
关键词 光通信 光纤通信 相干光正交频分复用 定时同步 恒幅零自相关序列 optical communications optical fiber communications coherent optical orthogonal frequency division multiplexing timing synchronization constant amplitude zero auto-correlation sequence
作者简介 曾祥烨,E-mail:jfliu@hebut.edu.cn.
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