The Research And Realization Of Transmission Technology In Visible Light Communication System Based On FPGA Prototyping

With the development of light emitting diode(LED)technology,LED lamps are widely used throughout the world.Visible light communication technology has many advantages,such as: safety,cost savings,without taking up additional spectrum resources and so on.And LEDs also have a lot of advantages like: low cost,fast response,long life and so on.The combination of these two has good prospects for development,which is attracting more and more attention.Orthogonal frequency division multiplexing(OFDM)is an effective approach to enhance transmission data rate of the visible light communication(VLC).However,the inherent nonlinearity of LEDs transmitter imposes performance limitations to the VLC systems.The nonlinearity of LEDs could be changed depending on the conditions of temperature variation,device aging and so on.In this paper,the channel estimation,equalization and predistortion are researched.Firstly,the advantages of the VLC system based on OFDM are introduced and the basic architecture of VLC by Field Programmable Gate Array(FPGA)is proposed.The basic realizaiton of each module is detailed.Then it introduces the channel estimation and equalization technique.Finally,it introduces various kinds of the mathematic model of nonlinear devices,and on this basis the polynomial model of LED is proposed and the method to realize the digital predistortion of LED is researched.