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Performance Research and Theoretical Design of Visible Light LED Communication System

Author: ZhangPengCheng
Tutor: LiuDeMing；LiuChen
School: Huazhong University of Science and Technology
Course: Optical Engineering
Keywords: Visible light communications White LED wireless channel System Performance
CLC: TN929.1
Type: Master's thesis
Year: 2011
Downloads: 138
Quote: 0
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Abstract


LED as a new kind of green light source products in the global energy shortages context , it will replace incandescent and fluorescent lamps has increasingly been recognized , visible LED - based communication also emerged . Visible LED communication relative to radio communications do not need to apply for spectrum , electromagnetic interference , communication and security advantages , there is no need to limit the transmit power advantages relative to the infrared communication . At home and abroad in its study , and mainly focus on the experimental study , for the study of the theory is mainly for small power LED , which no longer conform to the actual current lighting with LED . Therefore, this paper , the theoretical analysis of the high-power visible light LED communication system combined with theoretical analysis to explore the design of the transmitter and receiver . Of this research work as follows: ( 1) of the the white LED spectral characteristics and the modulation characteristics were studied, discussed improve phosphor white LED modulation bandwidth of two methods: the additive blue filter , and optimize the drive circuit . For the latter, a driving circuit based on a pre - equalization technique . (2) In the lighting under the constraint condition on the indoor optical wireless communication channel modeling, to obtain a specific light source , the room , and a detector arranged under the impulse response function ; analysis of the impact of a variety of factors on the SNR of the system , reducing system bandwidth, to improve the power of the emitted light and the concentrated light source can improve the system's signal - to - noise ratio . (3) of the transmission characteristics of the receiving system of white LED research, it has a root-raised cosine roll-off characteristics can eliminate inter-symbol interference and achieve a matched filter, using MATLAB design of the receiving filter to meet the above requirements .

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CLC: > Industrial Technology > Radio electronics, telecommunications technology > Wireless communications > Lightwave communications, laser communications
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