Short-distance high-speed two-way data transmission system based on wavelength division multiplexing rgb-led light source

Abstract

The invention relates to a close-range high-speed bidirectional data transmission system based on a wavelength division multiplexing RGB-LED light source. The system comprises at least two data transmission terminals, wherein at least one of the data transmission terminals is a mobile terminal; the data transmission terminal comprises a bidirectional data communication module used for sending and receiving LED optical signals; a master control module used for starting and controlling receiving and sending communication processes of data by the LED optical signals; a data storage module used for storing the received and sent data; the bidirectional data communication module comprises a physical layer device, an MAC layer device and a data bus; and the physical layer device comprises an LED optical signal transmitting end, a receiving end and a power supply. According to the system provided by the invention, the light source of the LED optical signals is an LED three-primary-color light source, and the limitation of an LED device modulation bandwidth to a data transmission rate is overcome by S-OFDM-QAM signal modulation. The system provided by the invention can realize bidirectional point-to-point high-speed data transmission, and can realize high-speed data transmission with transmission rate of 1.5 Gb / s within a close distance range of 1-10cm.

Description

technical field [0001] The invention belongs to the technical field of LED visible light wireless communication, and in particular relates to a short-distance high-speed two-way data transmission system based on a wavelength division multiplexing RGB-LED light source. Background technique [0002] Light-emitting diode (LED) has the characteristics of high brightness, high reliability, low energy loss and long service life. On the one hand, as a recognized next-generation green light source device, LED can be widely used in full-color display, signal indication and lighting source, etc. Many occasions. On the other hand, LED has the characteristics of good modulation performance and high response sensitivity, so it can modulate the digital signal to the visible light emitted by LED, and realize data transmission and information communication through the weak change of visible light intensity. Therefore, LED can combine the functions of display, lighting and data communicatio...

AI Technical Summary

Problems solved by technology

(3) Visible light cannot penetrate the wall, and the system has confidentiality

The first type is wired transmission. In the case of wired transmission to achieve big data sharing, whether it is transmitted through USB or through a wired network port, there are: the cable is not convenient to carry, and the transmission through the LAN is easy to cause information leakage. Point-to-point transmission needs to go through two or more times of copying and forwarding, USB and other interfaces have many problems and limitations such as low transmission rate and long time-consuming for G-bit large files and large data

The second category is wireless transmission. Short-distance wireless information transmission technologies mainly include Bluetooth, Wi-Fi LAN, RFID radio frequency, UWB ultra-wideband, ZIGBEE wireless sensor, etc. These technologies, without exception, belong to microwave or radio frequency communication, with: There are many disadvantages such as high cost for merchants and users, difficult installation of forwarding equipment, need to use radio waves to cause electromagnetic radiation, poor information security performance, low data transmission rate, and Wi-Fi wireless LAN requires traffic fees, etc.

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