光通信系统中低计算复杂度的载波相位估计方法  

Algorithm for Low-Computational-Complexity Carrier-Phase Estimation in Optical Communication Systems

作　　者：周志立 詹宜巨[4] 蔡庆玲[4] 阮秀凯[2,3] 蔡启博 Zhou Zhili;Zhan Yiju;Cai Qingling;Ruan Xiukai;Cai Qibo(School of Electronics and Information Technology,Sun Yat-Sen University,Guangzhou,Guangdong 510006,China;School of Engineering,Sun Yat-Sen University,Guangzhou,Guangdong 510006,China;College of Mathematics,Physics and Electronic Information Engineering,Wenzhou University, Wenzhou,Zhejiang 325035,China;National-Local Joint Engineering Laboratory for Digitalized Electrical Design Technology,Wenzhou University, Wenzhou,Zhejiang 325035,China)

机构地区：[1]中山大学电子与信息工程学院,广东广州510006 [2]温州大学数理与电子信息工程学院,浙江温州325035 [3]温州大学电气数字化设计技术国家地方联合工程实验室,浙江温州325035 [4]中山大学工学院,广东广州510006

出　　处：《光学学报》2018年第12期62-68,共7页Acta Optica Sinica

基　　金：国家自然科学基金面上项目(61671329);广东省协同创新与平台环境建设项目(2016A040403048);广东省公益研究与能力建设重点项目(2015B010103003)

摘　　要：相干光通信系统中,传统的盲相位搜索(BSP)算法具有良好的激光线宽容忍度,但传统BSP算法的高计算复杂度限制了其应用场合。针对这一问题,提出了一种低复杂度的相位噪声估计方法。该方法基于激光线宽所产生的相位噪声缓变的特点,对相位测试范围进行限定,并在此范围内搜索最佳相位估计值,最终降低了相位搜索的数目,极大地降低了算法的复杂度。同时,由于该算法避免了传统BSP方法可能存在的少数相位误估计的问题,因此在性能上略优于传统的BSP方法。最后,在偏振复用相干光通信系统中验证了该新方法的正确性与有效性。In the coherent optical communication system, the traditional blind phase search (BPS) algorithm has shown its excellent tolerance to laser linewidth, however its high-computational-complexity limits its practical applications. Thus a low-computational-complexity carrier phase estimation (CPE) algorithm is proposed, in which the phase-test range is defined based on the slow variance characteristic of noise phase produced by laser linewidth and the optimum phase angle is searched. Consequently, the number of phase searches is finally reduced and the computational complexity of this algorithm is also significantly reduced. Meanwhile, the proposed algorithm can avoid the problem of few phase mismatches existing in the traditional BPS algorithm and thus it is superior to the traditional BPS algorithm in performances. Finally, the correctness and validity of this algorithm are verified in the polarization multiplexing coherent optical communication system.

关 键 词：光通信 相位估计 计算复杂度 激光线宽 偏振复用 正交幅度调制 

分 类 号：TN929.11[电子电信—通信与信息系统]