基于信号处理的水下无线光通信综述

Overview of underwater optical wireless communication based on signal processing

摘要:

水下无线光通信(UOWC)具有的高带宽、低时延和抗电磁干扰等优势,成为了水下数据传输的重要手段之一。本文简述了UOWC的发展历史,总结了基于高性能光电器件和数字信号处理(DSP)两种方案的高速率长距离和高可靠性UOWC系统的研究现状。DSP中的调制技术能够实现通信速率和传输距离的折衷；信道均衡技术能够消除码间干扰,增大调制带宽；信道编码技术能够纠正接收信号中的错误；分集复用技术则能够分别提高系统可靠性和通信速率。除了研究高性能的光电器件以外,引入DSP技术能够从软件层面上进一步提高系统性能。

Abstract:

Due to the advantages of high bandwidth, low delay, and anti-interference ability, underwater optical wireless communication (UOWC) has become one of the important ways of underwater data transmission. The development history of UOWC is briefly described, and the research status of the high-speed, long-distance and high-reliability UOWC systems based on high-performance optoelectronic devices and digital signal processing (DSP) is summarized. The modulation technology can realize the tradeoff between data rate and transmission distance. Channel equalization technology can eliminate inter-symbol interference and increase the modulation bandwidth. Channel coding technology can correct the errors in the received signals. Diversity and multiplexing technology can improve the reliability and data rate of the system, respectively. In addition to researching high-performance optoelectronic devices, the employment of DSP technology can further improve the system performance in another way.