无线光通信中喷泉码的发展现状与展望  

Development and prospect of fountain codes in optical wireless communication

作　　者：吴一 刘宏展[1] 郝源 刘丽媛 Wu Yi;Liu Hongzhan;Hao Yuan;Liu Liyuan(Guangdong Provincial Key Laboratory of Nanophotonic Functional Materials and Devices,School of Information and Optoelectronics,South China Normal University,Guangzhou,Guangdong 510006,China)

机构地区：[1]华南师范大学信息光电子科技学院,广东省微纳光子功能材料与器件重点实验室,广东广州510006

出　　处：《光电工程》2020年第3期43-52,共10页Opto-Electronic Engineering

基　　金：国家自然科学基金资助项目(61875057,61475049)。

摘　　要：无线光通信信道复杂多变,喷泉码作为一种新兴的无速率编码无需信道的先验信息即可实现不同信道环境下的自适应传输,与传统编码相比更能提升无线传输的质量。本文首先总结了喷泉码应用于无线光通信的优势以及国内外喷泉码的发展现状,然后深入研究了两类喷泉码编码方案的设计以及对喷泉码性能影响重大的度分布函数的设计,总结了一种喷泉码即(LT)码的译码方法以及近些年不断提出优化的方案,同时指出了喷泉码设计中亟需解决的关键难点,最后提出了喷泉码应用于无线光通信的必要技术和探索方向。The optical wireless communication channel is complex and changeable. Fountain codes as an emerging rateless coding can achieve adaptive transmission in different channel environments without a priori information of the channel. Compared with traditional coding, it can improve the quality of wireless transmission. In this paper, we first summarize the advantages of fountain codes applied to optical wireless communication and the domestic and foreign researches on the development status of fountain codes. Then we deeply study the design of two kinds of fountain codes coding schemes, as well as the degree distribution function which has significant influence on the performance of fountain code. Soon we put forward one kind of fountain codes, namely Luby transform(LT) codes, and introduce the optimization schemes in recent years. Meanwhile, the key difficulties that need to be solved in the fountain codes design are pointed out. Finally, the necessary technologies and explorations direction of fountain codes for wireless optical communication are proposed.

关 键 词：无线光通信 喷泉码 无速率编码 度分布函数 

分 类 号：TN929.1[电子电信—通信与信息系统]