基于LED的可见光MISO定位系统中波束成形的研究  

The Investigation of Beamforming in LED Based MISO Positioning Visible Light Communication System

作　　者：梁尚雨 周盈君 乔梁[1] 张梦洁[1] 熊良明 迟楠[1] 

机构地区：[1]复旦大学,上海200433 [2]长飞光纤光缆股份有限公司,湖北武汉430070

出　　处：《照明工程学报》2018年第1期13-17,共5页China Illuminating Engineering Journal

基　　金：广东省科技前沿与关键技术专项资金(2016B010111002);国家自然科学基金项目(61177071)

摘　　要：由于可见光通信技术的能耗小且无电磁干扰等特点,该技术已越来越多地被运用到室内可见光定位系统中。但是,当定位目标接收到来自多个LED发送的位置信息时,受系统设备、传输路径或者多路定位信号本身等引入的系统延迟的影响,定位精度会大大降低。我们通过系统仿真和实验首次发现,由于系统延时的存在,接收信号的强度会发生波动。在多输入单输出(MISO)系统中,我们对在不同条件下的系统延时进行补偿,通过比较系统的误码率发现波束成形技术会明显提高系统定位精度。With the characteristics of energy-saving and no electromagnetic interference,visible light communication( VLC) technology is becoming more and more welcomed in indoor positioning system.However,due to the influence of system delay between signals including delay caused by devices,path delay and signal delay,positioning accuracy of an indoor visible light positioning system will be affected when targets receive positioning information from multiple LEDs. In this paper,we find that the intensity of the received signal will have a fluctuation due to the existence of system delay through simulation and experiment for the first time. In this Multiple-Input Single-Output( MISO) system,the specific system delay of the system under different conditions is mitigated by introducing delay between transmitted signals and comparing the bit error rate of the system. By using beamforming,the positioning accuracy of visible light positioning system is improved.

关 键 词：可见光通信 室内定位 MISO 波束成形 

分 类 号：TN929.12[电子电信—通信与信息系统]