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A Review of Modulation Schemes for Visible Light Communication


Faisal A. Dahri, Sajjad Ali, Muhammad Moazzam Jawaid


Vol. 18  No. 2  pp. 117-125


Visible Light Communication is one of the most researched topics because of high data rates and handles the today’s data requirement of the world. VLC uses optical sources such as Light Emitting Diode (LED) and Light Amplification by Stimulated Emission of Radiation (LASER) for optical wireless communication. The promising features of VLC are higher bandwidth, high data rates, reliability and a secure communication compared to other wireless technologies (such as Wi-Fi, LTE). This paper aims to review the impact of the different modulation schemes, single carrier and multicarrier as highlighted as Multiple Pulse Position Modulation, Variable Pulse Amplitude Position Modulation, Pulse Position Modulation, Color Shift Keying Modulation, Pulse Width Modulation, Double Inverse Pulse Position Modulation, Orthogonal Frequency Division Multiplexing Modulation and Non-return-to-zero modulation. The paper explores the performance of modulation schemes for VLC, the selected parameters and fundamental requirement of VLC system are power, bandwidth efficiency, spectral efficiency and the dimming factor of light sources. The efficiency and reliability of the communication system are analyzed based on tabulated parameters of VLC technology such as data rate, Signal to Noise Ratio (SNR) and Bit Error Rate (BER). In this study, a review of various modulation schemes have been undertaken by numerous researchers and it provides advantage and limitation of modulation schemes. This review contributes a fruitful data for visible light communication with suitable modulation schemes.


Visible light communication, LEDs