Design And Implementation Of Bidirectional High Speed VLC System

With the development of science and technology and the increasing demand for daily life,the problem of scarcity of traditional radio frequency communication spectrum resources has become increasingly prominent.In this context,visible light communication technology has received attention at home and abroad.Visible light communication is a supply for traditional communication.It is mainly used in indoor,electromagnetic environment sensitive and high security requirements.Visible light communication has the advantages of large bandwidth,high communication rate,green,and confidentiality.In the future,visible light communication is an indispensable branch of communication.The first part of this paper designs a high-speed bidirectional visible light communication system.The scheme uses a more general Ethernet port as the universal interface for communication.The hardware platform adopts the development tablet of the model Tiny4412,and the software system adopts the Android system.The system adopts the traditional network communication protocol and modifies the driver of the Ethernet port.The signal of the Ethernet port is modulated onto the LED lamp for transmission through signal conversion,and the receiving unit uses the photodetector to receive,and finally the system achieves two-way stability.The 10M communication rate,the system can be applied to various devices with Ethernet ports,and can also be connected to the Internet.In order to better enable visible light communication technology to enter the public life,visible screen communication was born in this background.Visible screen communication is an emerging branch of practical development of visible light communication,which is a further exploration of the visible light system into the public life.This paper designs a visible light screen communication system based on Convolutional Neural Network(CNN),It includes the definition of the frame structure,the introduction of the receiving unit CNN module,and the design of the resolution mechanism.The definition of the frame structure ensures the reliability of the system and enriches the diversity of the transmission content of the screen communication.The introduction of the CNN module allows the receiving unit to automatically identify the content sent by the screen,and does not rely on traditional positioning detection patterns,which improves the intelligence and information carrying capacity.The design of the two resolution mechanisms improves the universality of screen communication.It achieves 96%recognition success rate,achieves real-time 200 Kbit/s and non-real-time 300 Kbit/s communic ation rate,and can transmit text,picture,audio type files.