水下无线光通信中MIMO技术研究现状

Research Status of MIMO Technology in Underwater Wireless Optical Communication

水下无线光通信(UWOC)具有大容量和高速率等优势,然而受水下复杂环境和光学器件带宽的影响,实际通信范围和传输速率受到制约。多输入多输出(MIMO)技术将空间单流数据转换为多流数据并行传输,可以扩展UWOC的通信距离,缓解水下吸收、散射效应和湍流引起的通信性能下降,因而受到广泛关注。基于此,文章围绕UWOC中的MIMO技术,分析和总结了MIMO-UWOC的信道模型、研究现状、实验装置与原型以及发展趋势与展望。

Underwater Wireless Optical Communication(UWOC)has the advantages of large capacity,high speed and etc.However,it suffers from limited communication range and data rate in practice due to the complex underwater environment and the limited bandwidth of optical devices.Multiple-Input Multiple-Output(MIMO)technology has received considerable attention since it converts spatial single-stream data into multiple-stream data for parallel transmission.Therefore it can extend the UWOC range and alleviate the performance degradation caused by underwater absorption,scattering,and turbulence.In this paper,focusing on the MIMO technology in UWOC systems,we analyzed the channel modeling,research progress,experimental setups and prototypes,and the development and future trend of MIMO-UWOC technology.