A Review on Visible Light Communication System for 5G

Visible-Light Communications (VLC) is an emerging wireless communication technology, which appears as a promising solution for very high speed SG wireless networks in short-range communications. Is based on Intensity Modulation (IM). The implementation of VLC is based on Intensity Modulation/ Direct Detection (IM/DD) where the signal is directly modulated onto the instantaneous optical carrier power and direct detection-based photo-detector is used to generate an electrical current that is directly proportional to incident light power. The incident light, on the other hand carries no just the data signal but is also noise. In this paper, the proposed VLC-based signal transmission system model using IM/DD is presented. The injection current is modulated by a NRZ binary pseudo-random bit sequence. At the receiver, the photodiode produces a noisy electrical current which is proportional to the input optical intensity.