可见光通信中多级PLDPC与迭代译码设计  

Design of Multilevel PLDPC and Iterative Decoding in Visible Light Communications

作　　者：李宗艳 雷小茜 高寒 李世银 LI Zongyan;LEI Xiaoxi;GAO Han;LI Shiyin(School of Information and Control Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]中国矿业大学信息与控制工程学院,江苏徐州221116

出　　处：《光通信研究》2025年第2期40-45,共6页Study on Optical Communications

基　　金：国家自然科学基金资助项目(61976169);广西无线宽带通信与信号处理重点实验室资助项目(GXKL06230204)。

摘　　要：【目的】为有效提高可见光通信(VLC)系统的传输速率,降低通信系统的误码率(BER),文章提出了一种多级原模图低密度奇偶校验码(PLDPC)及迭代译码设计方案。【方法】首先,文章对基于色移键控(CSK)VLC系统中多级PLDPC和调制星座结构进行了深入研究,设计了多级PLDPC-CSK传输方案;然后,基于感知色约束条件,引入发送连续符号序列方法,提出了最小欧式距离处最小化符号序列数的CSK映射方案;最后,基于多级PLDPC-CSK传输系统设计了多级迭代软译码方案。【结果】仿真结果表明,在R=2和3 bit/symbol数据速率下,相比标准下同速率CSK星座结构,文章所提符号序列多级PLDPC-CSK设计方案分别有约1.8和4.5 dB的性能增益。【结论】文章所提设计方案的BER性能明显优于对比方案,提高了数据传输的可靠性,优化了VLC的系统性能。【Objective】In order to effectively improve the transmission rate of Visible Light Communication(VLC)system and reduce the Bit Error Rate(BER)of the communication system,a multilevel Protograph Low-density Parity-check Codes(PLDPC)and iterative decoding design scheme is proposed.【Methods】First,the multilevel PLDPC code and modulation constellation structure in the VLC system based on Color Shift Keying(CSK)are thoroughly investigated,and a multilevel PLDPC-CSK transmission scheme is designed.Secondly,based on the perceived color constraints,the method of transmitting consecutive symbol sequences is introduced,and the CSK mapping scheme that minimizes the number of symbol sequences at the minimum Euclidean distance is proposed.Finally,a multi-level iterative soft decoding scheme is designed based on the multi-level PLDPC-CSK transmission system.【Results】The simulation results show that at the data rates of R=2 and 3 bits/symbol,the multilevel PLDPC-CSK design scheme for symbol sequences proposed in this paper has a performance gain of about 1.8 and 4.5 dB,respectively,compared with the standard and other same-rate CSK constellation structures.【Conclusion】In summary,the BER performance of the design scheme of the paper is significantly better than that of the comparison scheme,which improves the reliability of data transmission and optimizes the system performance of VLC.

关 键 词：可见光通信 原模图低密度奇偶校验码 符号序列 多级迭代软译码 

分 类 号：TN929.1[电子电信—通信与信息系统]