LED visible light communication: communication with lights!

Visible light communication refers to a technical means for transmitting information by using high-speed light and dark light signals emitted by fluorescent lamps or light-emitting diodes. Compared with radio communication, visible light communication has opened up new spectrum resources, its transmission rate, security and privacy are extremely high, no electromagnetic interference and radiation, no frequency band licensing, and high speed can be realized at low cost by means of LED lights. Wireless communication is a typical green communication technology. After being designated by the United Nations as the "International Year of Light and Light-Based Technology" in 2015, the value and application potential of visible light communication is well known, and it has become the next generation of core communication technology competing in the world.

Rapid technological development

Opening up new spectrum resources

At present, the massive demand for wireless communication services and applications has led to the emergence of wireless communication technologies such as radio frequency identification, Bluetooth, ultra-wideband, and WiFi, which has also aggravated the contradiction between supply and demand of radio spectrum resources. In search of new spectrum resources and information transmission media, scientists turned their attention to visible light and made breakthroughs in a short period of time.

In 1998, the University of Hong Kong first proposed the concept of outdoor visible light communication. Two years later, Japanese scientists proposed the idea of ​​using LED lights as communication base stations for indoor wireless communication, and carried out basic theoretical research. Europe and the United States have focused on improving the technical performance of communication performance. The UK once refreshed the offline rate to 10 Gbit/s. In 2008, after the United States noticed the significant scientific value of visible light communication, the government invested 185 million US dollars to launch the "Smart Lighting" project, and plans to develop LED wireless communication intelligent lighting architecture within 10 years.

In 2008, the Chinese Academy of Sciences launched the "Semiconductor Lighting Information Network" research based on visible light communication. The National 973 Program and the 863 Program respectively set up key research projects for visible light communication technology. In 2014, the People's Liberation Army Information Engineering University led the establishment of the "China Visible Light Communication Industry Technology Innovation Strategic Alliance", which increased the real-time transmission rate of visible light communication to 50 Gbps and the modulation bandwidth to 430 Mbps.

Expert Xiao Chuan: Yu Hongyi, Dean of Information Systems Engineering College of PLA Information Engineering University, Doctoral Supervisor, Chief Expert of “Key Technology Research of Visible Light Communication System” of National 863 Program; First Prize of National Teaching Achievement, National Science and Technology Progress II 1 prize, 1 military science (provincial and ministerial level) first prize for scientific and technological progress, 11 national invention patents, and 2 monographs.

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