摘要
提出了一种基于多步插值的频偏估计算法,用于相干光通信中数字相干接收机的频偏估计补偿。该算法首先采用少量的数据点作FFT(快速傅里叶变换),粗估计出频偏值,然后采用DFT(离散傅里叶变换)进行多步插值计算,降低了计算复杂度。在一个28GBaud的QPSK(正交相移键控)仿真系统中进行了仿真验证,结果表明,与最新报道的LS(最小二乘)算法相比,该文所提算法可以大大降低现有算法的复杂度。
A Frequency Offset Estimation（FOE）algorithm based on multi-steps interpolations is proposed for coherent optical systems.Firstly,the proposed algorithm implements Fast Fourier Transform（FFT）operation with a small number of samples to obtain the coarse FOE.Then,it adopts Discrete Fourier Transform（DFT）to reduce the computational complexity.In a 28 GBaud coherent Quaternary Phase-Shift Keying（QPSK）system,compared with Least-Squares（LS）FOE algorithm,the proposed algorithm can significantly reduces the complexity.
作者
李海涛
辛鹏
李垠韬
黄丽艳
安慧蓉
袁卫国
雷学义
LI Hai-tao XIN Peng LI Yin-tao HUANG Li-yan AN Hui-rong YUAN Wei-guo LEI Xue-yi(Aecelink Technologies Co. ,Ltd. ,Wuhan 430205,China China Electric Power Research Institute, Beijing 102401,China State Grid Jibei Electric Power Company ,Beijing 100053,China State Grid Information and Telecommunication Brand, Beijing 100761,China)
出处
《光通信研究》
北大核心
2017年第1期19-22,共4页
Study on Optical Communications
关键词
相干光通信
频偏估计
快速傅里叶变换
多步插值
coherent optical communication
frequency offset estimation
FFT
multi-steps interpolation
