Research On De-strobing Technology In White Light Visible Light Communicatio

Visible light communication technology has the advantages of rich spectrum resources,fast communication rate,etc.It can be used as light source for communication while for illumination.It can relives the pressure of spectrum resources from the current radio frequency communication.It can be widely used to indoor position,intelligent home,intelligent transportation and other fields.However,the modulation of light source in the communication process will cause the occurrence of stroboflash,which will seriously affect the quality of lighting,and bring people both physical and psychological problems such as decreased vision,aggravated fatigue and inner anxiety.The circuits of the transmitter and receiver in the visible light communication are designed and an indoor visible light communication experimental system is set up.On this basis,the influence of stroboflash on human vision in indoor visible light communication system is studied.In the experiment,RC integral circuit is used to simulate the simulation end of the human eye.When the signal generator successively sends out signals of different frequencies,waveforms and duty ratios,the changing rule of human vision affected by the stroboflash is obtained respectively at the receiving end.In order to solve the stroboscopic problem of indoor visible light communication system,hybrid multi-pulse position modulation(MPPM)is introduced into the visible light communication system.The software part of the visible light communication system based on hybrid multi-pulse position modulation is designed by simulation.And the receiving and sending waveforms of the simulation system are compared,which further proves that the hybrid multi-pulse position modulation has a certain improved effect on the stroboflash of the communication system.In order to compare with other stroboscopic suppression methods,simulation experiments,theoretical analysis and data calculation are carried out for several methods when the signal source transmits the same data information.By comparing the graphics and information transmission rates before and after modulation of the visible light communication system based on Manchester encoding and multi-pulse position modulation,it can be concluded that the visible light communication system based on hybrid multi-pulse position modulation has a higher communication rate.