基于霍夫曼编码的室内可见光通信系统混合概率几何整形技术研究

In order to further improve channel capacity and narrow the gap with Shannon\'s limit, this paper proposes a new mixed probability geometric shaping method based on Huffman coding for indoor visible light communication systems.On the basis of probability shaping through Huffman encoding, a new constellation structure is designed for geometric shaping based on the generated code word hierarchy.By reusing the interleaver to add redundancy to the codewords, a bit sequence capable of channel transmission was generated, and the error rate and standardized mutual information performance of the scheme were evaluated through indoor visible light communication system simulation.The results verified that the error rate of the mixed probability geometric shaping system based on Huffman coding was significantly lower than that of the 13QAM with only geometric shaping, as well as the traditional 12QAM and 16QAM. The standard mutual information of this system was prioritized to reach 1 compared to other systems.