Performance Comparison of ACO-OFDM with C-OFDM using 4-QAM to Reduce BER in Visible Light Communication System

In this study, we evaluate the performance of Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing (ACO-OFDM) by comparing it to that of Conventional Orthogonal Frequency Division Multiplexing (C-OFDM) using Quadrature Amplitude Modulation (QAM). BER is compared between the innovative ACO-OFDM and the more common C-OFDM using the MATLAB programme. Both ACO-OFDM and standard OFDM employ a sample size of twenty, with a pre-test power of eighty percent, an alpha of 0.05, and a beta of 0.2. The significant BER for ACO-OFDM was measured to be 0.09, while for C-OFDM it was measured to be 0.1. In order to convert a bipolar OFDM signal to a unipolar OFDM signal, DC bias is not necessary for ACO-OFDM, hence the BER performance is enhanced. A significance level of 0.001 was found (p 0.05). Results obtained shows that the novel ACO-OFDM has significant and reduced BER when compared with C-OFDM using 4-QAM.