无线光相干通信智能信道均衡技术实验研究  

Experimental research on intelligent channel equalization technology for optical wireless coherent communication

作　　者：杨尚君 柯熙政[1,2] 梁静远 Yang Shangjun;Ke Xizheng;Liang Jingyuan(School of Automation and Information Engineering,Xi′an University of Technology,Xi′an 710048,China;Shaanxi Civil-Military Integration Key Laboratory of Intelligence Collaborative Networks,Xi′an 710048,China)

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

出　　处：《仪器仪表学报》2023年第5期131-139,共9页Chinese Journal of Scientific Instrument

基　　金：陕西省重点产业创新项目(2017ZDCXL-GY-06-01);西安市科技计划(2020KJRC0083)项目资助。

摘　　要：宽带无线光相干通信通过信道均衡来抑制大气湍流产生的码间串扰。以湍流环境下的中频信号作为样本,分别采用反向传播(BP)神经网络和长短期记忆(LSTM)神经网络进行训练,将训练达到稳定的网络模型作为信道均衡器,以均衡器输出的中频信号作为系统性能评价指标并与自适应光学波前畸变校正算法进行比较。仿真结果表明,智能信道均衡算法对于系统误码率的改善优于自适应光学波前畸变校正算法。实验结果表明:采用BP神经网络信道均衡技术、LSTM神经网络信道均衡技术,以及波前畸变校正技术后,中频信号直方图的峰值分别位于0.49、0.38、0.38 V,相应的系统误码率分别为3.79×10^(-5)、1.64×10^(-4)和8.48×10^(-2)。智能信道均衡技术相比于波前畸变校正技术对于中频信号幅值随机起伏和误码率都有明显改善。Channel equalization is used to suppress the inter symbol interference caused by atmospheric turbulence in the broadband optical wireless coherent communication system.In this article,intermediate frequency signals in turbulent environment are used as training samples.Back propagation(BP)neural network and long short-term memory(LSTM)neural network are utilized for training.The trained stable network model is used as a channel equalizer,and the output intermediate frequency signal by equalizer is used as the evaluation index of system performance and compared with the adaptive optics wavefront distortion correction algorithm.The simulation results show that by using BP neural network channel equalization technology,LSTM neural network channel equalization technology,and wavefront distortion correction technology,the peak values of intermediate frequency signal histogram are located at 0.49,0.38,and 0.38 V,and the corresponding system bit error rate is 3.79×10~(-5)、1.64×10~(-4)and 8.48×10~(-2),respectively.Compared with wavefront distortion correction technology,intelligent channel equalization technology has significantly improved on the random fluctuation of intermediate frequency signal amplitude and bit error rate.

关 键 词：无线光相干通信 信道均衡 波前畸变校正 中频信号 

分 类 号：TH741[机械工程—光学工程] TN929.12[机械工程—仪器科学与技术]