可见光通信预编码O-OFDM自适应符号分解技术研究

贾科军; 南钰桐; 杨博然; 魏少博

doi:10.13756/j.gtxyj.2024.04.230017

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可见光通信预编码O-OFDM自适应符号分解技术研究

光通信系统与网络技术 | 更新时间：2024-08-05

- 可见光通信预编码O-OFDM自适应符号分解技术研究
- Research on Adaptive Symbol Decomposition Technology of Precoding O-OFDM in Visible Light Communication
- 光通信研究 2024年第4期页码：23001701-23001707
- 作者机构：
  
  1.兰州理工大学　计算机与通信学院，兰州　730050
  2.西南交通大学　信息科学与技术学院，成都　610031
  3.国网陕西省电力有限公司　信息通信公司，西安　710000
- 作者简介：
  
  贾科军，教授。E-mail：kjjia@lut.edu.cn
- 基金信息：
  
  国家自然科学基金资助项目(61875080;61461026);甘肃省科技计划资助项目(22JR5RA276);兰州理工大学博士科研启动项目(061903)
- DOI：10.13756/j.gtxyj.2024.04.230017
  中图分类号： TN929.12
- 纸质出版日期：2024-08-10，
  
  收稿日期：2023-02-12，
  
  修回日期：2023-03-17，
- 稿件说明：
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贾科军，南钰桐，杨博然，等. 可见光通信预编码O-OFDM自适应符号分解技术研究[J]. 光通信研究，2024(4)：230017.

Jia K J, Nan Y T, Yang B R, et al. Research on Adaptive Symbol Decomposition Technology of Precoding O-OFDM in Visible Light Communication[J]. Study on Optical Communications, 2024(4)：230017.
贾科军，南钰桐，杨博然，等. 可见光通信预编码O-OFDM自适应符号分解技术研究[J]. 光通信研究，2024(4)：230017. DOI： 10.13756/j.gtxyj.2024.04.230017.

Jia K J, Nan Y T, Yang B R, et al. Research on Adaptive Symbol Decomposition Technology of Precoding O-OFDM in Visible Light Communication[J]. Study on Optical Communications, 2024(4)：230017. DOI： 10.13756/j.gtxyj.2024.04.230017.

摘要

【目的】

符号分解技术是降低峰值平均功率比（PAPR）方法中的一种，其将光正交频分复用（O-OFDM）符号分解为PAPR较小的多个分解符号，以抑制发光二极管（LED）的非线性效应。但当O-OFDM的PAPR较大时产生的分解符号较多，降低了信息速率和误码率（BER）性能。

【方法】

文章提出了一种预编码O-OFDM自适应符号分解串行传输（PCO-OFDM-ASDST）方案，采用预编码降低O-OFDM符号的PAPR，从而减小了自适应符号分解的平均符号分解次数。在多径信道下推导了理论信噪比（SNR）表达式，并采用蒙特卡洛仿真分析了PAPR、BER和信息速率性能。

【结果】

结果表明，在非对称限幅光正交频分复用（ACO-OFDM）系统4阶正交幅度调制（QAM）下，PCO-OFDM-ASDST在BER为10

－4

的情况下，其符号功率比自适应符号分解串行传输（ASDST）低7 dB；64QAM下，当符号功率为20 dBm时，可以提高10 Mbit/s的信息速率。

【结论】

PCO-OFDM-ASDST比ASDST系统具有更优的BER和信息传输速率等性能。

Abstract

【Objective】

The symbol decomposition technique aims to decompose Optical Orthogonal Frequency Division Multiplexing (O-OFDM) symbols into multiple symbols with a small Peak to Average Power Ratio (PAPR) to mitigate the non-linear effects of Light Emitting Diodes (LEDs). However

O-OFDM generates more decomposed symbols with a higher PAPR

thereby reducing the information rate and degrading the Bit Error Rate (BER) performance.

【Methods】

The proposed design of Precoding O-OFDM Adaptive Symbol Decomposition with Serial Transmission (PCO-OFDM-ASDST) system uses precoding scheme to reduce the PAPR of O-OFDM symbols. The proposed method can reduce the average number of symbol decompositions for adaptive symbol decomposition. The theoretical Signal-to-Noise Ratio (SNR) expressions are derived for multipath channels

and the performance of PAPR

BER

and information rate is analyzed using Monte Carlo BER simulations.

【Results】

The results demonstrate that under 4 Quadrature Amplitude Modulation (QAM) modulation in Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing (ACO-OFDM) systems

the symbol power required for PCO-OFDM-ASDST is 7 dB less than that of Adaptive Symbol Decomposition with Serial Transmission (ASDST) when the BER is 10

-4

. Moreover

under 64QAM

the information rate can be increased by 10 Mbit/s when the symbol power is 20 dBm.

【Conclusion】

The results indicate that the PCO-OFDM-ASDST outperforms ASDST systems in terms of BER and information transmission rate.

关键词

可见光通信光正交频分复用预编码峰值平均功率比符号分解

Keywords

visible light communicationsO-OFDMprecodingPAPRsymbol decomposing

references

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