A Frequency Offset Estimation Algorithm Based on Multi-steps Interpolation

LI Hai-tao; XIN Peng; LI Yin-tao; HUANG Li-yan; AN Hui-rong; YUAN Wei-guo; LEI Xue-yi

doi:10.13756/j.gtxyj.2017.01.007

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A Frequency Offset Estimation Algorithm Based on Multi-steps Interpolation

- A Frequency Offset Estimation Algorithm Based on Multi-steps Interpolation
- Study on Optical communication Issue 1, Pages: 19-22(2017)
- 作者机构：
  
  1. 武汉光迅科技股份有限公司
  2. 中国电力科学研究院
  3. 国网冀北电力有限公司信息通信分公司
  4. 国家电网公司信息通信分公司
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2017.01.007
  CLC： TN929.1
- Published：2017，
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[1]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(01):19-22.

LI Hai-tao, XIN Peng, LI Yin-tao, et al. A Frequency Offset Estimation Algorithm Based on Multi-steps Interpolation. [J]. (1):19-22(2017)
[1]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(01):19-22. DOI： 10.13756/j.gtxyj.2017.01.007.

LI Hai-tao, XIN Peng, LI Yin-tao, et al. A Frequency Offset Estimation Algorithm Based on Multi-steps Interpolation. [J]. (1):19-22(2017) DOI： 10.13756/j.gtxyj.2017.01.007.

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。

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.

关键词

相干光通信频偏估计快速傅里叶变换多步插值

Keywords

coherent optical communicationfrequency offset estimationFFTmulti-steps interpolation

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