Exploring the nonlinear coded superposed modulation MISO visible light communication system

Zengyi XU; Wenqing NIU; Hui CHEN; Zhixue HE; Nan CHI

doi:10.11959/j.issn.2096-3750.2022.00275

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Exploring the nonlinear coded superposed modulation MISO visible light communication system

Topic: IoT and Wireless Optical Communication | 更新时间：2024-06-05

- Exploring the nonlinear coded superposed modulation MISO visible light communication system
- Chinese Journal on Internet of Things Vol. 6, Issue 3, Pages: 14-22(2022)
- 作者机构：
  
  1. 复旦大学电磁波信息科学教育部重点实验室，上海 200433
  2. 上海低轨卫星通信与应用工程技术研究中心，上海 200433
  3. 上海低轨卫星通信技术协同创新中心，上海 200433
  4. 鹏城实验室，广东深圳 518055
- 作者简介：
- 基金信息：
- DOI：10.11959/j.issn.2096-3750.2022.00275
  CLC： TN929.1
- Online First：2022-09，
  
  Published：30 September 2022
- 稿件说明：
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Zengyi XU, Wenqing NIU, Hui CHEN, et al. Exploring the nonlinear coded superposed modulation MISO visible light communication system[J]. Chinese Journal on Internet of Things, 2022, 6(3): 14-22.
DOI：

Zengyi XU, Wenqing NIU, Hui CHEN, et al. Exploring the nonlinear coded superposed modulation MISO visible light communication system[J]. Chinese Journal on Internet of Things, 2022, 6(3): 14-22. DOI： 10.11959/j.issn.2096-3750.2022.00275.

摘要

基于发光二极管（LED

light-emitting diode）的可见光多输入单输出（MISO

multi-input single-output）系统信道带宽往往受 LED 器件的非线性和其发光的非相干特性限制。在信号传输中使用预编码可以以较低的成本缓解这一限制，目前的研究多采用相同的编码方式对全部信道进行编码。提出了一种非对称的编码方式，在两发一收的可见光通信系统中的一路使用了非线性编码。该方法以编码信道的误码率为代价，扩展了未编码信道的动态范围。在误码率门限设置为 3.8×10

-3

时，这一编码方式使得未编码信道较编码信道的动态范围扩大 30%。若同时使用非对称的前向纠错编码冗余，此种编码方式可以在维持两路信道正常通信的前提下灵活控制信道的动态范围，从而适应信道环境的变化。该研究将有利于室内多光源多输入可见光系统或水下可见光通信系统的研究。

Abstract

The light-emitting diode (LED) based visible light multi-input single-output (MISO) system usually suffers from the nonlinearity in LED and its incoherent nature in emission.Adopting precoding would alleviate this limitation at comparatively lower cost.Existing researches usually apply the same coding scheme to all the channels.An asymmetric coding scheme was proposed

which nonlinearly encodes one of the two channels in a MISO system.This solution enlarges the dynamic range of the uncoded channel at the cost of a higher bit error ratio (BER) in the coded one.When the BER threshold is set at 3.8×10

-3

the uncoded channel gains a dynamic range 30% larger than that of the coded one.If this solution is combined with flexible forward error correction redundancy

it would allow the system to adapt to varying channel condition while still maintaining the communication in both channels.This research would be beneficial in the study on indoor or underwater visible light communication (VLC) system.

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references

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