Research on Application of Polar Codes in Free Space Optical Communication

XING Lijuan; LI Zhuo; WANG Zhuo

doi:10.13756/j.gtxyj.2024.230058

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Research on Application of Polar Codes in Free Space Optical Communication

更新时间：2024-05-30

- Research on Application of Polar Codes in Free Space Optical Communication
- Study on Optical Communications Issue 3, Pages: 23005801-23005806(2024)
- 作者机构：
  
  西安电子科技大学　空天地一体化综合业务网全国重点实验室，西安　710071
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2024.230058
  CLC： TN911.22
- Published：10 June 2024，
  
  Received：20 April 2023，
  
  Revised：04 May 2023，
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邢莉娟，李卓，王卓.自由空间光通信中极化码的应用研究[J].光通信研究，2024（3）：230058.

Xing L J, Li Z, Wang Z. Research on Application of Polar Codes in Free Space Optical Communication[J]. Study on Optical Communications, 2024（3）：230058.
邢莉娟，李卓，王卓.自由空间光通信中极化码的应用研究[J].光通信研究，2024（3）：230058. DOI： 10.13756/j.gtxyj.2024.230058.

Xing L J, Li Z, Wang Z. Research on Application of Polar Codes in Free Space Optical Communication[J]. Study on Optical Communications, 2024（3）：230058. DOI： 10.13756/j.gtxyj.2024.230058.

摘要

【目的】

在自由空间光（FSO）通信中，大气湍流效应会导致通信链路性能下降。

【方法】

文章提出了一种极化码信道编译码方案，使用蒙特卡洛算法构造了针对FSO通信中常见的Gamma-Gamma分布大气湍流信道的极化码。比较了文章提出的极化码编译码方案与未编码以及相近码长的低密度奇偶校验（LDPC）码在Gamma-Gamma分布大气湍流信道下的误码率（BER）。

【结果】

仿真结果表明，所提极化码与未编码比较时，在弱湍流强度下，当信噪比>6.7 dB时，极化码方案性能相较于未编码更优；在中湍流强度下，当信噪比>10.3 dB时，极化码方案性能相较于未编码更优；在强湍流强度下，当信噪比>11.5 dB时，极化码方案性能相较于未编码更优。所提极化码与LDPC码比较时，在弱湍流情况下，当信噪比>7.1 dB时，极化码整体性能优于LDPC码；在中湍流条件下，当信噪比>10.6 dB时，极化码整体性能优于LDPC码；在强湍流条件下，当信噪比>12 dB时，极化码整体性能优于LDPC码。此外，在码长短、码率低和译码宽度小时，文章所提出的极化码编译码方案具有更优的性能。

【结论】

使用所提极化码编码后，有效改善了FSO通信系统中的大气湍流效应，而且在中、高湍流强度这两种恶劣的大气湍流信道环境中，文章所提方案展现出了比LDPC码更为明显的优势。表明在FSO通信中，极化码具有良好的发展前景。

Abstract

【Objective】

In Free Space Optical (FSO) communication

atmospheric turbulence can cause a decrease in communication link performance.

【Methods】

In this paper

a polar coding channel coding scheme is proposed for this problem

and Monte Carlo algorithm is used to construct polar codes for Gamma-Gamma distribution atmospheric turbulence channels commonly used in FSO communication. By comparing the Block Error Rates (BER) of the proposed polar coding scheme

uncoded transmission

and Low Density Parity Check (LDPC) codes with similar code lengths under Gamma-Gamma distribution atmospheric turbulence channels.

【Results】

The simulation results show that when the Signal-to-Noise Ratio (SNR) is greater than 6.7 dB in weak turbulence

10.3 dB in moderate turbulence

and 11.5 dB in strong turbulence

the proposed polar coding scheme performs better than uncoded transmission. Compared with LDPC codes

under weak turbulence conditions

when the SNR is greater than 7.1 dB

the overall performance of the proposed polar coding scheme is better than that of LDPC codes. Under moderate turbulence conditions

when the SNR is greater than 10.6 dB

the overall performance of the proposed polar coding scheme is better than that of LDPC codes. Under strong turbulence conditions

when the SNR is greater than 12 dB

the overall performance of the proposed polar coding scheme is better than that of LDPC codes. In addition

it is found that when the code length is short

the code rate is low

and the decoding width is small

the proposed polar coding scheme has better performance.

【Conclusion】

The use of the proposed polar coding scheme effectively improves the atmospheric turbulence effect in FSO communication systems. Moreover

in the harsh atmospheric turbulence channel environment of moderate and high turbulence intensities

the proposed polar coding scheme exhibits more obvious advantages than LDPC codes. This indicates that polar codes have good development prospects in FSO communication.

关键词

信道编码自由空间光通信极化码Gamma-Gamma分布

Keywords

channel codingFSO communicationpolar codesGamma-Gamma distribution

references

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