一种基于多步插值的频偏估计法
A Frequency Offset Estimation Algorithm Based on Multi-steps Interpolation
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
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28 GBaud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。
Abstract
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.
李海涛, 辛鹏, 李垠韬, 黄丽艳, 安慧蓉, 袁卫国, 雷学义. 一种基于多步插值的频偏估计法[J]. 光通信研究, 2017, 43(1): 19. LI Hai-tao, XIN Peng, LI Yin-tao, HUANG Li-yan, AN Hui-rong, YUAN Wei-guo, LEI Xue-yi. A Frequency Offset Estimation Algorithm Based on Multi-steps Interpolation[J]. Study On Optical Communications, 2017, 43(1): 19.