Experimental Demonstration of OFDM-VLC System Employing Clustering Algorithm

This paper introduces a high-speed visible light communication system based on Direct Current biased Optical-OFDM (DCO-OFDM), which combines the clustering algorithm (K-mediods) in machine learning with visible light communication to achieve post-equalization and signal demodulation. This equalization method can effectively reduce the impact of noise, facilitate the judgement of distorted constellation points, and enhance system performance. The system utilizes a commercial blue LED as emission source, a pre-equalization circuit to expand the modulation bandwidth, and a clustering algorithm as a post-equalizer. Based on DCO-OFDM, we experimentally demonstrated a 1.06 Gbit/s visible light link with 1m free space transmission, and experimental results indicated that the bit error rate (BER) is under the forward error correction threshold of 3.8×10-3.