基于可见光的通信定位一体化技术研究  

Research on integrated communication and positioning technology based on visible light

作　　者：王玮 王建萍[1] 冯莉芳 金建力 WANG Wei;WANG Jianping;FENG Lifang;JIN Jianli(School of Computer&Communication Engineering,Beijing Univercity of Science and Technology,Beijing 100083,China)

机构地区：[1]北京科技大学计算机与通信工程学院,北京100083

出　　处：《电信科学》2023年第5期57-66,共10页Telecommunications Science

基　　金：广东省基础与应用基础研究基金资助项目(No.2021B1515120086,No.2022A1515110770,No.2022A1515110154);北京科技大学青年教师学科交叉研究项目(中央高校基本科研业务费专项资金)资助项目(No.FRF-IDRY-21-019)。

摘　　要：可见光无线技术通过可见光传递信息,利用发光二极管(LED)光源在照明的同时实现通信和定位。可见光通信定位一体化(VLCP)技术是未来大规模物联网(IoT)应用的关键支撑技术之一。采用正交频分复用(OFDM)技术可将不同的频谱资源分别分配给可见光通信(VLC)和可见光定位(VLP)系统,同时实现通信和定位功能。资源分配是提升VLCP系统效率、拓展VLCP系统适用范围的关键所在。提出了一种基于误差矢量幅度(EVM)的新型资源分配方法,利用EVM分配VLCP系统中用于定位和通信的子载波,依据信道参数动态调整通信与定位性能,保证系统服务质量(QoS),提升系统信道利用率。实验结果表明,在1.5 m×1.5 m×1.5 m的室内环境下,提出的资源分配算法比固定资源分配算法至少可提高19.5%的信道利用率,在与采用信噪比(SNR)进行资源分配的算法性能相当的前提下,可大大节省系统资源,易于实际应用。Visible light wireless technology transmits information through visible light,utilizing light-emitting diode(LED)light sources to achieve communication and positioning while illuminating.Visible light communication posi-tioning integration(VLCP)technology is one of the key supporting technologies for future large-scale Internet of things(IoT)applications.Orthogonal frequency division multiplexing(OFDM)technology can be used to allocate different spectral resources to visible light communication(VLC)and visible light positioning(VLP)systems,while achieving communication and positioning functions.Resource allocation is the key to improving the efficiency of VLCP systems and expanding their applicability.A new resource allocation method based on error vector magnitude(EVM)was proposed.EVM was utilized to allocate subcarriers for positioning and communication in VLCP systems,communication and positioning performance was dynamically adjusted based on channel parameters,system quality of service(QoS)was ensured,and system channel utilization was improved.The experimental results indicate that at 1.5 m×1.5 m×1.5 m indoor environment,the proposed resource allocation algorithm can improve channel utilization by at least 19.5%compared to fixed resource allocation algorithms.Under the premise of comparable performance to algorithms that use signal-to-noise ratio(SNR)for resource allocation,it greatly saves system resources and is easy to apply in practice.

关 键 词：可见光通信定位 子载波分配 信道利用率 误差矢量幅度 

分 类 号：TN929.12[电子电信—通信与信息系统]