摘要
针对传统室外可见光通信系统中盲似然检测算法存在的问题,提出了一种改进的盲似然检测算法,即通过在发射端设置脉冲位置调制(PPM)帧头,接收端按帧检测分组和约束搜索。分析比较了实际室外环境下固定阈值检测、均值检测、传统盲似然检测和改进盲似然检测算法的系统误码性能。仿真结果表明:该算法有效地解决了平板问题,降低了复杂度。当湍流强度、背景光强度、传输距离和发光强度改变时,与其它检测算法相比,改进的盲似然算法的准确度更高,更适合应用于室外可见光通信。
Aiming at the problems of blind likelihood detection algorithm in traditional outdoor visible light communication system,this paper proposes an improved blind likelihood detection algorithm.By setting the pulse position modulation(PPM)header at the transmitting end,the receiving end detects the packet and constrains the search by frame.The system error performance of fixed threshold detection,mean detection,traditional blind likelihood detection and improved blind likelihood detection algorithm in real outdoor environment is analyzed and compared.The simulation results show that the algorithm effectively solves the plate problem and reduces the complexity.When the turbulence intensity,background light intensity,transmission distance and luminous intensity change,the improved blind likelihood algorithm is more accurate than other detection algorithms,and is more suitable for outdoor visible light communication.
作者
秦岭
宋科宁
李宝山
杜永兴
QIN Ling;SONG Kening;LI Baoshan;DU Yongxing(School of Information Engineering,Inner Mongolia University of Science and Technology,Baotou Inner Mongolia 014010,China)
出处
《光通信技术》
北大核心
2019年第2期9-13,共5页
Optical Communication Technology
基金
国家自然科学基金(No.61501266)资助
关键词
可见光通信
盲似然检测
脉冲位置调制
大气湍流
visible light communication
blind likelihood detection
pulse position modulation
atmospheric turbulence
作者简介
秦岭(1979-),女,内蒙古包头人,博士,副教授,主要研内容包括:智能交通领域的可见光通信、大气激光通信中的调制解调和室内定位技术。现任EI收录的中文核心期刊《光学学报》的审稿专家,在重要期刊和国际学术会议上公开发表论文20余篇,其中被SCI、EI、ISTP三大索引检索4篇,主持和参加国家自然科学基金3项,获得发明专利1项;通信作者:杜永兴(Emai:dyxql@imust.edu.cn)。
