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NOMA-based visible light non-pre-equalization communication system

This paper proposes an innovative approach to improve the adjustable bandwidth of the LED, a pre-equalization circuit is used at the end of the transmitting system in the traditional visible light communication system. However, the preequalization circuit causes a large amount of energy loss while increasing the adjustable bandwidth of the LED. To save energy on the pre-equalization circuit, we adopt an advance approach known as, non-orthogonal multiple access (NOMA) [1] in our visible light communication system (VLC). By adopting this method, different signals can be provided by different variation of power with the help of transmitter, without increasing the adjustable bandwidth of the LED. These signals are superimpose in the power domain and after this process signals are transmitted through LED. In the receiver module, serial interference cancellation (SIC) technology is adopted to demodulate these singles. Simulation results will show that our proposed system can save a large amount of energy on the pre-equalization circuit.