Outdoor visible light communication system based on mimo technology and ofdm technology

Abstract

The invention discloses an outdoor visible light communication system based on MIMO technology and OFDM technology, which includes: an encoding module, which converts information into a baseband digital signal, so that the information can be transmitted through an electrical signal; a modulation module, which modulates the baseband digital signal on a carrier wave Above; serial-to-parallel conversion module; the serial transmission signal is converted into multiple parallel transmission signals; the LED light group includes multiple LED lights, and each LED light will modulate one of the multiple parallel transmission signals. Make the signals of each channel orthogonal to each other, and then convert the sub-signals into optical signals through electro-optical conversion; and the information receiver includes a photoelectric conversion module for receiving optical signals, a subcarrier demodulation module connected with the photoelectric conversion module, The parallel-to-serial conversion module connected to the subcarrier demodulation module, the demodulation module connected to the parallel-to-serial conversion module, and the decoding module connected to the demodulation module are used to receive optical signals and convert them into information.

Description

technical field [0001] The present invention relates to the field of visible light communication systems, in particular to an outdoor visible light communication system based on MIMO technology and OFDM technology. Background technique [0002] Information is encoded and modulated to form electrical signals. Visible light communication uses light-emitting diodes to convert electrical signals into light signals, and uses lights to transmit information; photoelectric receivers convert optical signals into electrical signals, and demodulate and decode electrical signals. ,OK. Optical communication has the characteristics of strong anti-interference ability, does not occupy radio channels, and is simple to implement. Outdoors, there are abundant public lighting resources such as street lights, advertising lights, neon lights, and traffic lights. Using these lighting resources for visible light communication is conducive to solving urban wireless communication problems. To meet ...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide an outdoor visible light communication system based on MIMO technology and OFDM technology, which aims to solve the problem of reducing the intensity of light signals due to the scattering and absorption of light by the atmosphere, and the phase and phase of light coming from different light sources when the light reaches the receiver. The inconsistent time delay and the influence of background light lead to multipath fading, which restricts the technical problems of outdoor visible light communication quality

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