Coherent Free-space Optical Communication with 8-QAM Modulation Using Joint Algorithm of Amplitude Compensation and Digital Phase Recovery

LI Lin; WU Zhi-yong

doi:10.3788/fgxb20204102.0224

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Coherent Free-space Optical Communication with 8-QAM Modulation Using Joint Algorithm of Amplitude Compensation and Digital Phase Recovery

Luminescence Applications and Interdisciplinary Fields | 更新时间：2020-08-12

- Coherent Free-space Optical Communication with 8-QAM Modulation Using Joint Algorithm of Amplitude Compensation and Digital Phase Recovery
- Chinese Journal of Luminescence Vol. 41, Issue 2, Pages: 224-231(2020)
- 作者机构：
  
  1. 中国科学院长春光学精密机械与物理研究所,吉林长春,130033
  2. 中国科学院大学, 北京 100049
- 作者简介：
- 基金信息：
  
  Supported by National Natural Science Foundation of China(51605465);Research Proje
- DOI：10.3788/fgxb20204102.0224
  CLC： TN929.12
- Published：5 February 2020，
  
  Received：2 July 2019，
  
  Revised：14 August 2019，
扫描看全文
李林, 吴志勇,. 基于幅度相位联合校正算法的8-QAM自由空间相干光通信[J]. 发光学报, 2020,41(2): 224-231

LI Lin, WU Zhi-yong,. Coherent Free-space Optical Communication with 8-QAM Modulation Using Joint Algorithm of Amplitude Compensation and Digital Phase Recovery[J]. Chinese Journal of Luminescence, 2020,41(2): 224-231
李林, 吴志勇,. 基于幅度相位联合校正算法的8-QAM自由空间相干光通信[J]. 发光学报, 2020,41(2): 224-231 DOI： 10.3788/fgxb20204102.0224.

LI Lin, WU Zhi-yong,. Coherent Free-space Optical Communication with 8-QAM Modulation Using Joint Algorithm of Amplitude Compensation and Digital Phase Recovery[J]. Chinese Journal of Luminescence, 2020,41(2): 224-231 DOI： 10.3788/fgxb20204102.0224.

摘要

提出了基于幅度相位联合校正算法的8阶正交幅度调制（8-QAM）自由空间相干光通信方案。与传统的自由空间光通信方案相比，本文提出的方案不仅无需信道状态信息（CSI）就可以实现对原信号的高精度还原，同时还具有较高的光谱效率。仿真实验表明，当接收端与发射端的频偏

=20 MHz、激光器联合线宽

=10 kHz、信噪比为20 dB时，该方案在归一化大气闪烁标准差

=0.25、归一化相位噪声方差

=0.07的对数正态湍流信道条件下，其误码率（BER）与未采用联合校正算法的8-QAM系统相比低4个量级。

Abstract

Coherent free-space optical communication with 8-quadrature amplitude modulation (8-QAM) using joint algorithm of amplitude compensation and digital phase recovery is proposed. Compared with traditional free-space optical communication schemes

the scheme we proposed not only can restore the signal without requiring the knowledge of instantaneous channel state information

but also has higher spectral efficiency. Numerical studies show that the bit error rate of the proposed system is four orders of magnitude lower than that of the 8-QAM system without joint algorithm

when the frequency offset

=20 MHz between the receiver and the transmitter

the lasers joint linewidth

=10 kHz

and the signal-to-noise ratio is 20 dB for a lognormal turbulence channel with

=0.25 and phase noise with

=0.07.

关键词

自由空间光通信正交幅度调制相干探测。

Keywords

free-space optical communicationsquadrature amplitude modulation (QAM)coherent detection

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SUN Xin

LI Lin

Related Institution

Modern Engineering Training Center, Chang'an University

Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China

University of Chinese Academy of Sciences, Beijing 100049, China

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