Timing Synchronization Technique based on SCPPM Code Auxiliary under Large Timing Error

XIANG Jin-song; ZHANG Pei; WANG Ju; DENG Chen-hui; JIANG Hao

doi:10.13756/j.gtxyj.2017.06.010

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Timing Synchronization Technique based on SCPPM Code Auxiliary under Large Timing Error

- Timing Synchronization Technique based on SCPPM Code Auxiliary under Large Timing Error
- Study on Optical communication Issue 6, Pages: 57-61(2017)
- 作者机构：
  
  重庆邮电大学通信与信息工程学院
- 作者简介：
- 基金信息：
- DOI：10.13756/j.gtxyj.2017.06.010
  CLC： TN929.1
- Published：2017，
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[1]向劲松,张培,王举,邓晨辉,蒋豪.基于SCPPM码辅助的迭代定时同步技术[J].光通信研究,2017(06):57-61.

XIANG Jin-song, ZHANG Pei, WANG Ju, et al. Timing Synchronization Technique based on SCPPM Code Auxiliary under Large Timing Error. [J]. (6):57-61(2017)
[1]向劲松,张培,王举,邓晨辉,蒋豪.基于SCPPM码辅助的迭代定时同步技术[J].光通信研究,2017(06):57-61. DOI： 10.13756/j.gtxyj.2017.06.010.

XIANG Jin-song, ZHANG Pei, WANG Ju, et al. Timing Synchronization Technique based on SCPPM Code Auxiliary under Large Timing Error. [J]. (6):57-61(2017) DOI： 10.13756/j.gtxyj.2017.06.010.

摘要

针对大定时误差下串行级联脉冲位置调制（SCPPM）同步难的问题

提出一种基于期望最大化（EM）算法估计的SCPPM码辅助迭代定时同步方法。该方法首先由SCPPM译码输出软信息构造出评价函数

先进行大范围定时偏移的粗同步

之后再利用EM算法进行细同步

并且通过简化评价函数以及搜索方式降低同步算法的复杂度。仿真结果表明

该方法能够在大定时误差下有效地实现系统同步

与使用EM算法相比

其有效同步范围得到了大幅提高。

Abstract

In order to address the problem of the Serially Concatenated Pulse-Position Modulation（SCPPM）synchronization in large timing error

an SCPPM code auxiliary iterative timing synchronization method based on Expectation Maximization（EM）estimation is proposed.Firstly

the method constructs the evaluation function from SCPPM decoding output soft information

achieving the coarse synchronization of wide range timing offsets

following the EM algorithm for fine synchronization.Then

the complexity of synchronization algorithm is reduced by simplifying the evaluation function and searching method.The simulation results show that the proposed method can realize the system synchronization effectively under large timing error

and the effective synchronization range is greatly improved compared with the EM algorithm.

关键词

空间光通信SCPPM码期望最大化算法码辅助迭代定时同步

Keywords

space optical communicationSCPPM codeEM algorithmcode assistantiterative timing synchronization

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School of Communication and Information Engineering, Chongqing University of Posts and Telecommunications

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