一种32Q-AM相干光通信系统中相位估算算法  

Carrier phase estimation for 32-QAM optical systems using quasi-QPSK-partitioning algorithm

作　　者：辛鹏[1] 李海涛[2,3] 李垠韬 袁卫国 韩纪龙[2,3] 安慧蓉[1] 雷学义[5] 黄丽艳[2,3] XIN Peng LI Haitao LI Yintao YUAN Weiguo Plan Jilong AN Huirong LEI Xueyi HUANG Liyan(China Electric Power Research Institute, Beijing 102401, China Accelink Technologies Co., Ltd., Wuhan 430205, China Wuhan Research Institute of Post and elecommunications, Wuhan 430074, China State Grid Jibei Electric Power Company, Beijing 100053, China State Grid Information and Telecommunication Brand, Beijing 100761, China)

机构地区：[1]中国电力科学研究院,北京102401 [2]光迅科技股份有限公司,武汉430205 [3]武汉邮电科学研究院,武汉430074 [4]国网冀北电力有限公司信息通信分公司,北京100053 [5]国家电网公司信息通信分公司,北京100761

出　　处：《光通信技术》2017年第2期9-12,共4页Optical Communication Technology

摘　　要：针对相干光纤通信系统中32Q-AM调制格式,提出了一种在第一级使用准QPSK分割的算法来替代传统的QPSK分割的改进相位估计算法。仿真结果显示,在1dB信噪比劣化的情况下当误码率达到1E-2时,该算法相对于传统的QPSK分割算法的激光器线宽带来的相位噪声的容忍度提高了85%。通过与精细的估计算法级联可以获得最大激光器线宽容忍度为5.1E-5。In this paper, a quasi quadrature phase shift keying （QPSK） partitioning method is proposed to replace the conventional QPSK partitioning method in the first stage of the carrier phase estimation （CPE） algorithms for the 32-QAM coherent optical syste^m. By simulation, for 1 dB SNR penalty at bit error rate （BER） of 1E-2, the proposed method can achieve an improving of 85% for combined linewidth symbol duration product tolerance compared with conventional method for single stage. Combined with the fine stage, the maximum tolerable combined linewidth symbol duration product can be up to 5.1E-5.

关 键 词：相干光通信 32-QAM 载波相位估计 相干检测 数字信号处理 

分 类 号：TN914.332[电子电信—通信与信息系统]