Hardware design and realization of visible light communication system based on 2ASK modulation

The visible light communication(VLC) is a novel wireless optical communication technology based on white LED. It can integrate the illumination function with communication function. To increase the transmission distance,the binary amplitude shift keying(2ASK)modulation and pretreatment scheme is proposed by considering the limited bandwidth of white LED. The corresponding LED modulation transmitting and demodulation receiving systems were designed and realized. The principle and circuit structure of each module in the system are described. The performance of this communication system was explored in hardware experiments. The experimental results prove that the maximum distortionless transmission distance can reach503 cm when the modulation frequency is 50 k Hz,which can satisfy the requirement of low-speed long-distance transmission.