可见光通信中LED非线性补偿和带宽拓展技术

可见光通信(VLC)是一项有前景的技术,作为现有无线通信网络的有益补充,可提供高速率、低延迟及多设备接入等通信服务。借助传统无线通信的高性能编码调制技术,已经设计并实现了各种适配于VLC系统的物理层通信技术。不同于传统射频通信,VLC采用LED作为信号的发射源,LED的调制容易产生非线性失真且调制带宽有限,已成为VLC高速通信的技术瓶颈。针对这两方面的挑战,本文以白光LED为出发点,阐述了白光LED能有效兼顾照明和通信的特性,总结和分类了非线性失真补偿和拓展调制带宽的多种技术,最后本文提出了LED封装材料及工艺、新型Micro-LED器件研究、光源布局设计、码间干扰消除技术等开放性研究问题,以期提高可见光通信系统的性能。

LED nonlinearity compensation and bandwidth expansion techniques in visible light communication

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.