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                                    Simultaneous dimming controlling and data transmission are usually required in a white LED based indoor visible light communication system. However, the diming controlling   LED normally interferes the data transmission due to the modulation nonlinearity of LED. In order to solve this problem, a scheme by separating the LED for the functions of dimming control and data transmission respectively is proposed in this paper. In the scheme, the LEDs used for dimming control function are driven by a dc amplified circuit, and the LEDs for data transmission are driven by a digital modulation circuit respectively. In this way, the modulation distortion to the data signal caused by the modulation nonlinearity can be avoided even if the dimming is at high level dc driven current. The proof-of-concept experiment of a 2.5Mbit/s visible light communication system demonstrates that the dimming controlling and data transmission can be realized simultaneously in a simple way, and the data transmission is not affected by the dimming controlling function. Compared to previous methods, the scheme in this paper is simpler and cost effective, and makes sense when high rate data is transmitted in a visible light communication system.

Existing system	Proposed System
In the golden days, the suppliers only serve  the menu to the customer.        But every often we asking the menu from the supplier is quit complex.   Drawbacks         They need other help.          There is no automatic system.         Power consumption is high.	Here we introduce a new technology in restaurant for automatic digital menu transmission through mobile phone.          LIFI technology is used to wide transmission of data without occurring of noise. Advantages          The system automatically provide the menu in indoor without any manual work.       It reduces the complexity among to server and customer.