A Timing Synchronization Method for ACO-OFDM Optical Wireless Communications Based on Superposition of Training and Data

WANG Ru-yan; WANG Zhuo; WU Da-peng; GAO Di; ZUO Qiong-hua; ZHAO Hui; SHANGGUAN Song-tao

doi:10.3969/j.issn.0372-2112.2012.01.026

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A Timing Synchronization Method for ACO-OFDM Optical Wireless Communications Based on Superposition of Training and Data

更新时间：2025-07-16

- A Timing Synchronization Method for ACO-OFDM Optical Wireless Communications Based on Superposition of Training and Data
- Acta Electronica Sinica Vol. 40, Issue 1, Pages: 162-166(2012)
- 作者机构：
  
  1. 重庆邮电大学通信与信息工程学院,重庆,400065
  2. 中国移动通信集团河南有限公司三门峡分公司,河南,三门峡,472000
  3. 中国移动通信集团设计院有限公司河北分公司,河北,石家庄,050021
  4. 信息产业部有线通信产品质量监督检验中心,四川,成都,610062
  5. 重庆邮电大学通信与信息工程学院重庆,400065
  6. 中国移动通信集团河南有限公司三门峡分公司河南三门峡,472000
  7. 中国移动通信集团设计院有限公司河北分公司河北石家庄,050021
  8. 信息产业部有线通信产品质量监督检验中心四川成都,610062
- 作者简介：
- 基金信息：
- DOI：10.3969/j.issn.0372-2112.2012.01.026
  CLC： TN929.1
- Published：2012
- 稿件说明：
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WANG Ru-yan, WANG Zhuo, WU Da-peng, et al. A Timing Synchronization Method for ACO-OFDM Optical Wireless Communications Based on Superposition of Training and Data[J]. Acta Electronica Sinica, 2012, 40(1): 162-166.
DOI：

WANG Ru-yan, WANG Zhuo, WU Da-peng, et al. A Timing Synchronization Method for ACO-OFDM Optical Wireless Communications Based on Superposition of Training and Data[J]. Acta Electronica Sinica, 2012, 40(1): 162-166. DOI： 10.3969/j.issn.0372-2112.2012.01.026.

摘要

提出了一种适用于ACO-OFDM无线光通信系统的基于时域叠加训练序列的时间同步方法.该方法将经过ACO-OFDM调制后的伪随机序列作为训练序列

并将其在一个符号周期内与数据同时发送.接收端利用本地序列与接收信号进行相关运算

对所叠加训练序列的能量进行积累

从而实现时间同步.仿真表明

在多种信道模型下

该方法能够有效改善同步准确率和定时偏移方差

同时极大地提高了带宽效率

使得时间功率分配具有较强的灵活性.

Abstract

A new synchronization method for asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM)-based optical wireless communications systems with the superimposed m sequence is proposed.The pseudo-noise (PN) sequence modulated by ACO-OFDM as training sequence is sent with a data symbol in the same symbol cycle.Receiver by using local sequence and the received signal correlation operation

accumulates the energy of the superimposed training sequence in order to achieve timing synchronization.Via simulation

both in LOS channel and diffuse channel

the proposed method has better synchronization accuracy

lower timing offset estimator variance

and the flexibility of time and power allocation

improves the bandwidth efficiency.

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