激光通信系统的波特间隔均衡器设计  

Design of baud interval equalizer in laser communication system

作　　者：曹明静 郭玉秀[1] 刘娜[1] CAO Mingjing;GUO Yuxiu;LIU Na(Department of physics and Information Engineering,Cangzhou Normal University,Cangzhou Hebei 061001,China)

机构地区：[1]沧州师范学院物理与信息工程系,河北沧州061001

出　　处：《激光杂志》2023年第12期156-160,共5页Laser Journal

基　　金：河北省高等学校科学技术研究项目(No.ZD2020410)。

摘　　要：当前应用的均衡器,主要采用单一的盲自适应算法实现信道均衡处理,容易出现误差扩散的现象,导致均衡器误码率较高。因此,针对激光通信系统,设计一种新的波特间隔均衡器。根据激光通信系统的接收端接收信号模型、干扰模型,定义激光通信系统信道模型。基于信道均衡要求,设计由前滤波器、反馈滤波器两个主要部分组成的多阶滤波器,作为波特间隔均衡器的基础结构。通过设置MSE切换门限联动LMS算法和CMA算法,形成自适应混合均衡算法,确保均衡器具有优越的信道均衡处理性能。最后,在FPGA上实现波特间隔均衡器。实验结果显示:应用所设计均衡器后,激光通信系统的最小误码率降低至10-4,达到了提升激光通信质量的目的。The currently applied equalizers,which mainly use a single blind adaptive algorithm to achieve channel equalization processing,are prone to the phenomenon of error spreading,resulting in a high equalizer BER.There-fore,a new baud interval equalizer is designed for the laser communication system.According to the received signal model and interference model of laser communication system,the channel model of laser communication system is de-fined.Based on the channel equalization requirements,a multi-order filter consisting of two main parts,pre-filter and feedback filter,is designed as the basic structure of the baud interval equalizer.By setting the MSE switching thresh-old to link the LMS algorithm and CMA algorithm,an adaptive hybrid equalization algorithm is formed to ensure the e-qualizer has superior channel equalization processing performance.Finally,the baud interval equalizer is implemented on FPGA.The experimental results show that after applying the designed equalizer,the minimum BER of the laser communication system is reduced to 10-4,which achieves the purpose of improving the quality of laser communication.

关 键 词：激光通信 波特间隔均衡器 码间干扰 信道 自适应算法 抽头系数 

分 类 号：TN949[电子电信—信号与信息处理]