1 桂林理工大学信息科学与工程学院, 广西桂林 541004
2 桂林理工大学广西嵌入式技术与智能系统重点实验室, 广西桂林 541004
针对车联网中的通信需求, 本文提出了一种即插即用的可见光车灯信号发送控制装置。装置利用车灯低压直流供电线路进行信号传输, 并通过车灯发送可见光通信信号。装置前级将接收的输入信号, 由高速开关电路控制线路的供电通断, 从而将通信信号传导至后级并由后级控制 LED车灯发送可见光信号。通过推导和实验选用电容作为线路储能器件, 并采用 2FSK调制和 Modbus协议建立前后级间通信。实验证明装置可以利用线路实现最快不低于 4 Mb/s的信号传输, 并通过可见光车灯控制地锁的实验模型, 进一步验证了该装置接收信号并通过低压直流供电线路控制车灯发送可见光信号的功能。本设计为利用直流供电线路传输信息并点亮的 LED灯实现可见光通信, 提供了参考设计模型。
直流电力线通信 可见光通信 LED通信 车地通信 车联网 direct current power line communication visible light communication LED communication vehicle to device communication internet of vehicle 光学 精密工程
2020, 28(12): 2710
Author Affiliations
Abstract
1 School of Information Science Technology, East China Normal University, Shanghai 200241, China
2 College of Information Science and Engineering, Guilin University of Technology, Guilin 541004, China
3 Colleges and Universities Key Laboratory of Intelligent Integrated Automation, Guilin University of Electronic Technology, Guilin 541004, China
A real-time visible light communication (VLC) to universal asynchronous receiver/transmitter (UART) conversion system is made up of a transmitter with a light emitting diode (LED) and a receiver with a photodiode (PD), by which a VLC system is connected to traditional communication modes, and the data are transferred by wireless visible light. UART packets are converted to light packets by the modulation of a 10 kHz on-off-keying (OOK) light signal, and the data losses in the transportation are avoided by the protection of a data buffer mechanism. The experimental results reveal that the real-time VLC to UART conversion system can provide a real-time VLC transmission way for two UART devices in not less than 10 m at a baud rate not less than 19 200 Bd with stable ambient lighting at the same time.
光电子快报（英文版）
2016, 12(4): 299
1 桂林理工大学 信息科学与工程学院, 广西 桂林 541004
2 桂林理工大学 广西空间信息与测绘重点实验室, 广西 桂林 541004
3 桂林理工大学 机械与控制工程学院, 广西 桂林 541004
针对当前LED交通诱导屏要求高可靠、高稳定、少维修的特点,本文将整块显示屏分为多个子区域,利用ZigBee无线网络对各子区域进行分布式控制.每个子区域作为一个ZigBee节点由一片CC2530控制实现显示、通信、检测等功能.所有节点硬件设计相同,均含高频核心板与低频底板.主控制模块与远程控制中心通信,生成各子区域的点阵显示数据并传送给协调器.使用Z-Stack协议栈在基于事件处理的多任务构架下设计了用户程序,实现了单播和广播通信,以及基于有限状态机的串口通信.高频核心板+低频底板的结构可降低PCB制板成本并提高电路板通用性和互换性.该设计增加了系统稳定性和可靠性,防止了故障扩散,减少了维修频度,还能将数据吞吐量分担到多个CPU上,使整个系统成为多核并行处理机.
ZigBee网络 分布式系统 底板+核心板 单播 广播 交通诱导屏 ZigBee wireless network distributed system core board and base board point to point communication broadcast communication variable message sign
Author Affiliations
Abstract
1 College of Information Science and Engineering, Guilin University of Technology, Guilin 541004, China
2 East China Normal University, Shanghai 200241, China
In this paper, an experimental scheme for cordwood color division multiplexing (CDM) visible light communication (VLC) system is proposed. The principle and structure of the experimental scheme are described. Right angle prisms and band-pass filter are used to make the unit of the optical collector and splitter. We can add or subtract the unit as we need. The cordwood CDM-VLC system can also be effectively used as a model to accomplish color shift keying and color division duplexing. The experimental system provides a new way for researching VLC.
光电子快报（英文版）
2014, 10(6): 459
