基于反向传播神经网络盲均衡算法的水下涡旋光复用系统性能研究  

Performance Research on Underwater Vortex Optical Multiplexing System Based on Back Propagation Neural Network Blind Equalization Algorithm

作　　者：王明军[1,2] 屠思凯 Wang Mingjun;Tu Sikai(School of Automation and Information Engineering,Xi’an University of Technology,Xi’an 710048,Shaanxi,China;Shaanxi Civil-Military Integration Key Laboratory of Intelligence Collaborative Networks,Xi’an 710126,Shaanxi,China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048 [2]陕西省智能协同网络军民共建重点实验室,陕西西安710126

出　　处：《激光与光电子学进展》2023年第17期101-107,共7页Laser & Optoelectronics Progress

基　　金：国家自然科学基金重大研究计划培育项目(92052106);国家自然科学基金(61771385,62101313);陕西省杰出青年科学基金(2020JC-42);固体激光技术重点实验室开放基金(6142404190301);西安市高校人才服务企业工程项目(GXYD14.26)。

摘　　要：在水下信道中使用涡旋光复用通信技术可以有效提高通信系统的信道容量,然而海洋湍流会引起涡旋光束的模态间串扰,造成通信系统的性能下降。为了缓解模态串扰问题,本文引入基于反向传播(BP)神经网络的盲均衡算法,采取4路涡旋光进行复用传输,使用随机相位屏法模拟海洋湍流,仿真分析了系统在加入BP盲均衡算法后,改变海洋湍流强度、传输距离以及涡旋光复用模式等因素下,系统误码率的改善情况。仿真结果表明,利用BP神经网络的盲均衡算法能够有效降低海洋湍流对系统误码率的影响,且在复用模式间隔选为2时,系统性能改善明显。Vortex optical multiplexing communication technology can effectively improve the channel capacity of a communication system in an underwater channel.However,ocean turbulence causes the inter modal crosstalk of the vortex beam,degrading the performance of the communication system.To alleviate the modal crosstalk problem,this study presents a blind equalization algorithm based on a back propagation(BP)neural network.Four channels of vortex light are used for multiplexing transmission,and the random phase screen method is used to simulate ocean turbulence.After the BP blind equalization algorithm is implemented,the improvement in the system bit error rate is simulated and analyzed under conditions of varying ocean turbulence intensities,transmission distances,and vortex light multiplexing modes.The simulation results show that the blind equalization algorithm using the BP neural network can effectively reduce the impact of ocean turbulence on the bit error rate of the system,and the system performance significantly improves when the multiplexing mode interval is 2.

关 键 词：海洋光学 涡旋光复用通信 海洋湍流 反向传播神经网络 盲均衡 误码率 

分 类 号：TN929.1[电子电信—通信与信息系统]