Research On Design And Implementation Of Visible Light Communication System Based On Spread Spectrum

Visible light communication technology has the advantages of abundant spectral resources,high response sensitivity,energy saving,environmental protection,and communication security,which alleviate the problem of spectrum resource constraint in existing wireless communication.Since the technical problems of multipath interference,severe background light interference and light-emitting diode nonlinearity still exist in the current visible light communication system,a technique is proposed to improve the anti-interference capability of the visible light communication system.This paper presents a detailed dynamic analysis of the development and status of visible light communication,and proposes a study on the design and implementation of a spread spectrum-based visible light communication system based on the traditional visible light communication system in combination with spread spectrum modulation technology,which includes.Firstly,the composition and key technical principles of the visible light communication system are highlighted.The working characteristics of the LED light source are studied,the visible light communication channel link mode and channel characteristics are analyzed,the working principle of the photo-detector is introduced,and the principle and characteristics of the spread spectrum technology used are studied.Secondly,the modulation mode of the visible light communication system is simulated and analyzed and the selection of modulation mode is carried out.The framework of the visible light communication simulation system is constructed and the system simulation results are tested,and the influencing factors of the system BER are explored.Thirdly,the overall scheme of the spread spectrum-based visible light communication system is designed,and the device selection and circuit design of its transmitter and receiver are studied,focusing on the spread spectrum and PPM modulation scheme of the system and its corresponding demodulation scheme,and the simulation study of the system is carried out using software and hardware circuit tests.Finally,the audio test device of the visible light communication system is designed,the experimental platform of the spread spectrum based visible light communication system is built,and the overall performance of the system is analyzed using the serial communication system,and the effects of different transmission rates,communication distances,reception angles,and the presence or absence of optical noise on the BER of the system are studied.Comparative experiments were designed and performance tests of the spread spectrum-based visible light communication system were conducted.