Study On Key Techniques Of White Light LED Communication Reception System

With the improve of white light LED's luminance,white light LED lighting will be more popular.The trend that semiconductor lighting replace traditional lighting will be realize sooner or later.Because LED's modulation frequency is so high that white light LED can be use to communicate.Compared with other way of communication white light LED communication have a lot of merits,so there are more and more study of visible light communication based on white light LED.This paper is base on the white light LED's irradiance mechanism.By discuss the work theory of the white light LED lighting communication system,the paper emphasize the reception system.Through the analyse of photodiode's structure and work theory we study the matter that how to design reception circuit and construct the reception system.The noise source and how to restrain the noise of the white LED lighting communication system was studyed deeply.The reception system was optimized and the performance was improved obviousely.This paper base on the influence factors of white light LED's communication performance,The SNR(Signial Noise Ratio) and the intersymbol interference produced by difference path of the white light LED lighting communicationg system is studyed.By studying the white light LED's distribution of illuminance and the SNR,we pointed out how much the effect of the the intersymbol interference produced by difference path to the communication performance.We apply the diversity reception in white light LED lighting communication system.We put forward a reception technology based on angle diversity to resist the intersymbol interference produced by difference path and advance the SNR.By theory analyse and experiment investigate we gave out the model of the optical detector layout and the diversity reception of the circuit,then the performance of the optical receiver with diversity reception was studied at last.