【Abstract】Visible light communication technology is mainly based on light emitting diodes (LEDs). Rely on the existing lighting network infrastructure to complete information transmission and networking. For indoor multi-light lighting scenarios, the constellation diagram optimization and power resource optimization under lighting constraints are studied; combined with optical intelligent reflective surfaces, the reflection channels are dynamically controlled to improve the system transmission data rate and coverage. At the same time, preliminary research has revealed the impact of the stroboscopic effect of low-frequency modulated light signals on the human body, which means that LED photobiological effects need to be fully considered in future signal design.
【Keywords】Visible light communication; light-emitting diode; optical intelligent reflective surface; stroboscopic effect
0 Preface
Visible light communication (VLC) uses the visible spectrum band of 380 to 780 nm for wireless transmission of information. The most common method is to perform high-speed intensity modulation on the lighting source that is imperceptible to the naked eye, so that it can carry the information that needs to be transmitted. The receiving end completes the information reception by detecting changes in light intensity. In-depth research and popularization of visible light communication technology have been mainly concentrated in the past two to three decades. In the 1990s, Dr. Shuji Nakamura and others made an epoch-making invention of the blue light emitting diode (LED), which won the 2014 Nobel Prize in Physics. This marks the third revolutionary leap in the history of artificial light source development, and the successful promotion of LED industrialization has greatly promoted the development of visible light communication technology.
LED-based semiconductor lighting technology has the advantages of high power-to-light energy conversion efficiency (power saving), fast response adjustment, adjustable intensity and color temperature, long service life, and small size. These advantages have promoted its rapid promotion. Analysis of energy consumption data shows that when LED lamps are fully utilized to replace lighting fixtures, lighting power consumption is expected to eventually decrease from