相干光FBMC/OQAM系统的整数频偏估计与补偿方法  

Estimation and Compensation of Integer Frequency Offset in Coherent Optical Offset Quadrature Amplitude Modulation Based Filter Bank Multicarrier Systems

作　　者：崇涵丹 王道斌[1] 元丽华[1] 李晓晓[1] 曹明华[2] 王惠琴[2] Chong Handan;Wang Daobin;Yuan Lihua;Li Xiaoxiao;Cao Minghua;Wang Huiqin(School of Scierice,Lanzhou University of Technology,Lanzhou,Gansu 730050,China;School of Computer and Communication,Lanzhou University of Technology,Lanzhou,Gansu 730050,China)

机构地区：[1]兰州理工大学理学院,甘肃兰州730050 [2]兰州理工大学计算机与通信学院,甘肃兰州730050

出　　处：《光学学报》2019年第12期76-84,共9页Acta Optica Sinica

基　　金：国家自然科学基金(61367007,61875080,61861026);甘肃省自然科学基金(17JR5RA123)

摘　　要：针对激光器频偏较大的场景,研究了相干光滤波器组多载波通信(CO-FBMC/OQAM)系统的一种整数频偏估计与补偿方法。对以前的分数频偏研究工作进行了扩展,设计了一种混合型的训练序列结构。利用这种训练序列,不仅能完成分数频偏的估计,也能够实现对整数频偏的准确估计。利用数值仿真研究了该方法在CO-FBMC/OQAM系统中的有效性,结果表明该算法的准确频偏估计范围可以达到12倍子载波频率间隔,经过频偏补偿后的系统误码率可以低于前向纠错(FEC)极限。所提方法能够为CO-FBMC/OQAM系统的研究和应用提供有益的参考。Aiming at scenes with large laser frequency offset,we study an integer frequency offset estimation and compensation method for a coherent optical offset quadrature amplitude modulation based filter bank multicarrier(CO-FBMC/OQAM) system. We expand previous researches and investigate the fractional frequency offset(FFO) by designing a hybrid training sequence structure. Based on this training sequence, we can precisely estimate the FFO and effectively implement the integer frequency offset(IFO) estimation. Further, numerical simulations are used to examine the effectiveness of the proposed method with respect to the CO-FBMC/OQAM system. The results denote that the maximum IFO can be accurately estimated to be 12 times that of the subcarrier frequency interval and that the bit error rate after frequency offset compensation is lower than the forward error correction limit. The proposed method can provide a useful reference for the research and development of the CO-FBMC/OQAM system.

关 键 词：光通信 滤波器组多载波调制 正交频分复用 频偏估计 相干光通信系统 

分 类 号：TN913.7[电子电信—通信与信息系统]