基于多层非对称剪裁光正交频分复用的水下光无线通信系统  

Layered Asymmetrically Clipped Optical Orthogonal Frequency Division Multiplexing Based Underwater Optical-Wireless Communication System

作　　者：刘龙 周骥 王海德 熊灿阳 黄红斌[1] 刘伟平[1] Liu Long;Zhou Ji;Wang Haide;Xiong Canyang;Huang Hongbin;Liu Weiping(College of Information Science and Technology,Jinan University,Guangzhou,Guangdong 510632,China)

机构地区：[1]暨南大学信息科学技术学院,广东广州510632

出　　处：《激光与光电子学进展》2021年第21期62-68,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金资助项目(62005102,61875076);广东省自然科学基金资助项目(2019A1515011059);中央高校基本科研业务费资助项目(21619309);信息光子学与光通信国家重点实验室(北京邮电大学)开放课题(IPOC2019A001)。

摘　　要：为了提高水下光无线通信(UOWC)的频谱效率和功率效率,提出了一种基于多层非对称剪裁光正交频分复用(Layered-ACO-OFDM)的UOWC系统。该系统通过对子载波分层调制的方法,充分利用了传统非对称剪裁光正交频分复用(ACO-OFDM)中损失的频谱资源,极大地提高了光无线通信系统的频谱效率。此外,Layered-ACOOFDM系统不需要加入直流偏置,故功率效率也得到了大大提升。考虑了可见光在海水中传输过程中的吸收和散射效应,建立了基于蒙特卡罗方法的UOWC信道模型,并较为全面地研究了海水中不同叶绿素浓度和不同接收机参数下的信道响应。结果表明,与传统ACO-OFDM相比,基于Layered-ACO-OFDM的UOWC系统具有频谱效率高的优势。同时,当信噪比为27 dB时,在清澈海水中其可以实现10 m距离下1 Gb/s的高速率通信。In order to improve the spectral efficiency and power efficiency for underwater optical-wireless communication(UOWC),a UOWC system based on layered asymmetrically clipped optical orthogonal frequency division multiplexing(Layered-ACO-OFDM)is proposed.The system makes full use of the spectrum resources lost in traditional asymmetrically clipped optical orthogonal frequency division multiplexing(ACO-OFDM)by the means of layered modulation of subcarriers,which greatly improves the spectrum efficiency for optical wireless communication system.Moreover,since the Layered-ACO-OFDM system does not need to add direct current bias,the power efficiency is also greatly improved.A UOWC channel model based on Monte Carlo method is established considering the absorption and scattering effects of visible light transmission in seawater,and the channel response under different chlorophyll concentrations and different receiver parameters is studied comprehensively.The results show that the UOWC system based on Layered-ACO-OFDM has the advantage of high spectrum efficiency compared with the traditional ACO-OFDM.When the signal-to-noise ratio is 27 dB,it can achieve high-speed communication of 1 Gb/s at a distance of 10 m in clean seawater.

关 键 词：光通信 多层非对称剪裁光正交频分复用系统 频谱效率 蒙特卡罗仿真 信道特征 水下光无线通信 

分 类 号：TN929.1[电子电信—通信与信息系统]