信道复用技术在LED水下可见光通信中的应用  

Application of channel multiplexing technology in LED underwater visible light communication

作　　者：彭嘉驰 郭建中 李燕龙[2] 张亮 周英 艾勇 梁赫西 PENG Jiachi;GUO Jianzhong;LI Yanlong;ZHANG Liang;ZHOU Ying;AI Yong;LIANG Hexi(School of Electronic and Electrical Engineering,Wuhan Textile University,Wuhan 430200,China;Key Laboratory of Cognitive Radio and Information Processing(Ministry of Education),Guilin University of Electronic Technology,Guilin 541004,China;Optical Communication Equipment Research and Development Department,Wuhan Liubo Optoelectronic Technology Co.,Ltd.,Wuhan 430072,China;School of Computer and Information Engineering,Hubei Normal University,Huangshi 435002,China)

机构地区：[1]武汉纺织大学电子与电气工程学院,湖北武汉430200 [2]桂林电子科技大学认知无线电与信息处理省部共建教育部重点实验室,广西桂林541004 [3]武汉六博光电技术有限责任公司光通信设备研发部,湖北武汉430072 [4]湖北师范大学计算机与信息工程学院,湖北黄石435002

出　　处：《应用光学》2023年第5期1133-1141,共9页Journal of Applied Optics

基　　金：湖北省科技厅创新发展项目(2021BAB099);武汉市科技局课题(2020010602012047)。

摘　　要：以发光二极管(LED)为发射端的水下可见光通信(UVLC)系统因器件带宽所限其传输速率较低,且受水质环境影响较大,致使通信综合性能不佳。为提高信道容量与通信质量,将信道复用技术应用在LED-UVLC系统中,以现场可编程门阵列(FPGA)为数据处理核心,搭建LED蓝绿光发射阵列以及雪崩光电二极管(APD)接收阵列,设计出了一个4×4的多信道UVLC系统。我们将系统置于长20 m的水下环境中,以26.7 Mbit/s的通信速率,完成了误码率(BER)约为10^(−7)的双向传输。实验数据表明,当传输不同大小的数据文件时,对比传统的单输入单输出水下可见光通信(SISO-UVLC)系统,节省了约4倍的通信时间,且与仿真的信道容量增益一致。另外,在水质和通信距离相同的条件下,本系统能获得更优的BER性能。Underwater visible light communication(UVLC)system with light emitting diode(LED)as transmitter has a low transmission rate due to the limited device bandwidth and it is greatly affected by water environment quality that makes the communication comprehensive performance poor.In order to improve the channel capacity and communication quality,the channel multiplexing technology into the LED-UVLC system was applied.The FPGA was used as the data processing core,LED blue and green light emission array and avalanche photodiode(APD)receiving array were built,and a 4×4 multichannel UVLC system was designed.We placed the system in an underwater environment with a length of 20 m and achieved bidirectional transmission with a bit error rate(BER)of approximately 10^(−7) at a communication rate of 26.7 Mbit/s.The experimental results show that when transmitting data files of different sizes,compared with the traditional single input single output(SISO)-UVLC system,the communication time is saved about 4 times and the channel capacity gain is consistent with the simulation.In addition,with the same water quality and communication distance,the system can achieve better BER performance.

关 键 词：水下可见光通信 信道容量 通信质量 信道复用技术 

分 类 号：TN929.1[电子电信—通信与信息系统]