Research On Solving The Multipath Effect Of Visible Light Communication

With the rapid progress of science and technology,people's requirements for the quality of life continue to improve,one of which is the requirement for communication.At present,the 5th generation communication technology has gradually realized commercial use.At present,various countries have begun to develop 6th generation communication technology.However,in many fields or occasions,there are still blind spots and defects in many communications,and they are not intelligent enough.The revolution of communication technology is imperative.Many communication problems exist in different fields and production units,which restrict the development of the industry and reduce productivity and work efficiency.A new form of communication that is more convenient,faster,safer,and free of electromagnetic effects is urgently needed to solve this communication problem.Visible light has been creatively proposed as the carrier of signal transmission.Visible Light Communication is a perfect solution to the above problems: because communication can only be realized when There is a light source,so Visible Light Communication ensures the security of information.Light waves replaced radio signals,effectively avoiding electromagnetic interference,people's life,and property safety,and industrial production safety is also guaranteed.However,the application of Visible Light Communication still faces many problems,one of which is the multipath effect.The overall bit error rate of the communication system increases under the influence of the multipath effect,which also weakens the stability of the system.In the Visible Light Communication system,the multipath effect is very obvious because of The high frequency and short wavelength of visible light.With analyzing the characteristics of The Visible Light Communication system in the multipath fading channel by modeling and simulation,Orthogonal frequency division multiplexing(OFDM)technology is proposed to solve the multipath effect problem in Visible Light Communication.Orthogonal frequency division multiplexing(OFDM)technology has become a new favorite of current communication technology because of its good ability to resist inter symbol interference(ISI),economical and intensive frequency band utilization,and stable communication ability.Based on the existing Theoretical basis,simulation research and analysis are carried out based on the ability of OFDM and ACO-OFDM to solve the problem of the multipath effect in Visible Light Communication.The main works are as follows:(1)The establishment of the optical communication channel model,analysis of its channel characteristics,impact response characteristics,system communication performance;(2)The influence of the multipath effect on optical power and the bit error rate of visible light communication is obtained by modeling and analyzing the multipath effect Rayleigh model and the multipath effect Rician model.(3)The visible light communication system is improved by using OFDM technology,and the bit error rate is reduced under different SNR conditions through simulation.(4)By analyzing the disadvantages and deficiencies of OFDM,we try to use the improved ACO-OFDM to simulate the multipath effect,and get the system communication error rate which is more optimized than that of OFDM.