一种基于多步插值的频偏估计法

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.

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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.

一种基于多步插值的频偏估计法

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