Low Density Parity Check Code (LDPC) for Enhancement of Visible Light Communication (VLC) Performance

Abstract

Visible Light Communication (VLC) that utilizes free space optics as a transmission channel has a high-speed data communication capability, which uses Light Emitting Diode (LED) as a transmitter. Problems occurred in this wireless communication is the distance. VLC can only reach relatively short distance if compared to Radio Frequency (RF). There are many ways to reach a better distance performance on VLC and one of them is the error correction. In this paper, a comparison between uncoded and Quasi-Cyclic-Low Density Parity Check (QC-LDPC) codes implementation on VLC has been compared and the number of decoding iterations is simulated to reach better performance. The encoding technique of QC-LDPC codes is using the G-Matrix and Bit Flipping algorithm as the decoding. The result shows that distance increases 7% in case of QC-LDPC codes from the uncoded VLC system and 27.5% energy efficiency are increased. The number of decoding iterations also contributes an impact to Bit Error Rate (BER) performance. The simulation results proof that on VLC system using QC-LDPC codes shows better performance compared to the uncoded system.