Tested and certified by the Ministry of Industry and Information Technology, China's "Key Technology Research of Visible Light Communication System" has recently achieved a major breakthrough, real-time communication rate increased to 50Gbps (bits per second), equivalent to 0.2 seconds to complete the download of a high-definition movie.
Visible light communication is a new high-speed data transmission technology that uses the light of semiconductor lighting (LED lights) to achieve "on the Internet with light." The visible light communication technology is green and low-carbon, can realize near-zero energy consumption communication, and can effectively avoid the weakness of radio communication electromagnetic signal leakage, and quickly construct a safety information space for anti-interference and anti-interception.
Qi Jiangxing, an expert in China's information field and an academician of the Chinese Academy of Engineering, said that at present, there are about 44 billion lamps and lanterns in the world, and the integration of tens of billions of LED lighting equipment with other devices will constitute a huge visible light communication network.
It is conceivable that after the realization of large-scale visible light communication in the future, each lamp can be used as a high-speed network hotspot. When people wait for the car, they can download several movies under the street light. On the plane and high-speed rail, they can also use the LED light source to wirelessly access the high-speed Internet. To meet the network end wireless communication requirements of indoor network, Internet of Things, Internet of Vehicles, Industry 4.0, secure payment, smart city, defense communication, weaponry, electromagnetic sensitive area, etc., to provide a new and cheap access method for Internet+.
Yan Jiangxing predicts that in the next few decades, the transmission of information will exceed the carrying capacity of the existing radio spectrum. The visible light communication technology can effectively break through the serious shortage of radio spectrum resources, and is the next generation wireless communication technology with broad application prospects. First, it can form a strategic emerging industry with an annual output value of tens of billions.
High-speed transmission has always been one of the focus of research in the field of visible light communication. Yu Hongyi's R&D team of the People's Liberation Army Information Engineering University adopts a synergistic processing method of optics and electricity, breaking through the key technologies such as high-efficiency suppression of mutual interference in visible space channels, and entering the stage of integration and miniaturization design and implementation.
This university is a research institute engaged in the research and development of visible light communication technology in China. In 2013, it took the lead in undertaking China's first visible light 863 project and established the "China Visible Light Communication Industry Technology Alliance". After more than three years of scientific and technological research, it has successfully developed application demonstration systems such as “visible light on demand TV serviceâ€, “visible light wireless broadcast†and “visible light precise positioningâ€.
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