The Compensation Method of Pulse Broadening Effect in PPM and LDPC Optical Communication System

XIANG Jin-song; XIAO Gang

doi:10.13756/j.gtxyj.2016.04.018

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The Compensation Method of Pulse Broadening Effect in PPM and LDPC Optical Communication System

- The Compensation Method of Pulse Broadening Effect in PPM and LDPC Optical Communication System
- Study on Optical communication Issue 4, Pages: 60-62(2016)
- 作者机构：
  
  重庆邮电大学光纤通信技术重点实验室
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2016.04.018
  CLC： TN929.1
- Published：2016，
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[1]向劲松,肖刚.PPM与LDPC光通信系统中脉冲展宽效应补偿办法[J].光通信研究,2016(04):60-62+71.

XIANG Jin-song, XIAO Gang. The Compensation Method of Pulse Broadening Effect in PPM and LDPC Optical Communication System. [J]. (4):60-62(2016)
[1]向劲松,肖刚.PPM与LDPC光通信系统中脉冲展宽效应补偿办法[J].光通信研究,2016(04):60-62+71. DOI： 10.13756/j.gtxyj.2016.04.018.

XIANG Jin-song, XIAO Gang. The Compensation Method of Pulse Broadening Effect in PPM and LDPC Optical Communication System. [J]. (4):60-62(2016) DOI： 10.13756/j.gtxyj.2016.04.018.

摘要

在空间光通信系统中

每个入射光脉冲都会发生脉冲展宽效应

导致时隙似然比计算时出现信息丢失

系统性能下降。文章基于PPM（脉冲相位调制）与LDPC（低密度奇偶校验码）迭代解调系统

研究了用时隙似然比加权的办法来补偿脉冲展宽带来的影响。针对服从指数分布与高斯分布两种情况的脉冲展宽

分别采用指数似然比补偿和高斯似然比补偿两种方法进行似然比计算。仿真结果表明

脉冲展宽服从标准差为0.46的高斯分布时

采用似然比补偿的方法可以使误码率性能提高1.3dB。在一定抖动范围内

高斯补偿和指数补偿具有很好的互换性。

Abstract

In the space optical communication system

the pulse broadening effect during every incident light pulse may cause the information lost when calculating the likelihood ratio

which deteriorates the system performance.In this paper

we study the slot likelihood ratio weighted method to compensate of the effects of pulse broadening based on PPM and LDPC iterative demodulation system.When the pulse broadening obey exponential distribution and Gauss distribution

the likelihood ratio are calculated using both of the Gaussian compensation and exponential compensation.Simulation result shows that when the pulse broadening obey the 0.46 standard deviation of Gauss distribution

the likelihood ratio compensation method can improve the performance by 1.3dB.Within a certain range jitter

Gaussian compensation and exponential compensation has a very good interchangeability.

关键词

空间光通信脉冲展宽泊松信道似然比补偿

Keywords

space optical communicationpulse broadeningpoisson channellikelihood ratio compensation

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