The phase estimation of geometric shaping 8-QAM modulations based on K-means clustering in underwater visible light communication

摘要

With more and more human underwater activities carrying out, underwater visible light communication has received increasing attention worldwide. To solve the problem of noise and nonlinearity in underwater visible light communication systems, we proposed a phase deviation correction algorithm based on K-means clustering to correct the phase deviation of special-shaped 8-QAM constellations. The experimental results indicate the performance of the circle has the maximum improvement after using the phase deviation correction algorithm. Before the use of the K-means phase correction algorithm, the highest data rate that circle can achieve is 1.3875 Gbps. The highest data rate increases to 1.4625 Gbps after applying the algorithm.