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Wang Y H, Cao F, Deng Z Y, et al. LED nonlinearity compensation and bandwidth expansion techniques in visible light communication[J]. Opto-Electron Eng, 2020, 47(3): 190671. doi: 10.12086/oee.2020.190671
Citation: Wang Y H, Cao F, Deng Z Y, et al. LED nonlinearity compensation and bandwidth expansion techniques in visible light communication[J]. Opto-Electron Eng, 2020, 47(3): 190671. doi: 10.12086/oee.2020.190671
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LED nonlinearity compensation and bandwidth expansion techniques in visible light communication

  • 1.

    School of Information Engineering, Nanchang University, Nanchang, Jiangxi 330000, China

  • 2.

    School of Electronic Information, Wuhan University, Wuhan, Hubei 430072, China

  • 3.

    School of Information and Control Engineering, China University of Mining and Technology, Xuzhou, Jiangsu 221116, China

    • Fund Project: Supported by National Natural Science Foundation of China (61661028), Major Projects of the Ministry of Science and Technology (2018YF1404300), and Provincial Youth Fund Major Project (20152ACB21008)
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Received Date 31 October 2019
Revised Date 03 January 2020
Published Date 01 March 2020
    Abstract
  • Visible light communication (VLC) is a promising technology that complements existing wireless communication networks to provide high-speed, low-latency, and multi-device access. With the high-performance code modulation technology of traditional wireless communication, various physical layer communication technologies adapted to VLC systems have been designed and implemented. Different from traditional radio frequency (RF) communication, VLC uses LED as the signal source. The modulation of LED is easy to produce nonlinear distortion and the modulation bandwidth is limited. It has become the technical bottleneck of VLC high-speed communication. In view of the challenges of these two aspects, taking white LED as the starting point, this paper expounds that white LED can effectively balance the characteristics of illumination and communication, summarizes and classifies various techniques of nonlinear distortion compensation and extended modulation bandwidth. Finally, this paper proposes open research issues such as LED package materials and processes, new Micro-LED device research, light source layout design, and intercode interference cancellation technology are expected to improve the performance of visible light communication systems.
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    • Overview

  • Overview: Visible light communication (VLC) is a promising technology that can be used as a useful complement to existing wireless communication networks, it can provide high speed, low latency and multi-device access communication services. With the help of high performance coding modulation technology of traditional wireless communication, a variety of physical layer communication technologies adapted to VLC system have been designed and implemented. Different from traditional radio frequency communication, VLC use LED as the transmitting source of signals. The modulation of LEDs is prone to produce nonlinear distortion and limits the modulation bandwidth, which has become the technical bottleneck of VLC high-speed communication. According to these two challenges, with white LED as the starting point, this paper expounds the characteristics of white LED that can effectively both illumination and communications, and then summarizes and classifies a variety of technologies for the nonlinear distortion compensation and extension of the LED modulation bandwidth. In view of the nonlinear distortion compensation technology, this paper enumerates pre-distortion compensation scheme such as the pre-distortion circuit model, memory polynomial model, adaptive pre-distortion model, and post-distortion compensation schemes which include the decision feedback equalization model, adaptive distortion model, the frequency domain equalization. However, a lot of limitations in nonlinear model, computational complexity, additional physical feedback loop, model structure and other indicators need to be improved and optimized. For the LED bandwidth expansion technology, the paper classifies and discusses the pre-equalization technology and post-equalization technology that expanding the bandwidth of white LED can further improve the communication performance of the system and reduce the cost of the system. It is necessary to further study the software indicators such as adjust the circuit complexity, circuit debugging difficulty, circuit stability, sensitivity of component hardware index and computing resources, complexity of model structure. The advantages and disadvantages of the pre-distortion compensation technology and LED bandwidth expansion and the complexity of the design are summarized from the receiver and transmitter to further optimize the system. This team adopted pre-distortion technology and analog pre-equalization technology at the transmitter, and added digital post-equalization technology at the receiver to optimize the performance of VLC. At last, in order to improve the performance of visible light communication system, this paper puts forward some open research problems, such as LED packaging materials and technology, new micro-LED device research, light source layout design, inter-code interference elimination technology.

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