| 摘要: |
| 无线传感器网络节点可能会被部署到开发维护人员难以接触的环境中.一旦节点出现故障，需要通过无线网络实施对故障节点的调试修复.然而，一些无线通信故障会导致节点从网络中失联，这时依赖于无线网络的传统调试修复交互手段可能失效.此外，由于传感器网络节点的硬件结构简单，一般也很难提供额外的调试手段.为此，通过挖掘现有传感器节点与光学相机上多种可见光相关模块的潜能，在不修改硬件的前提下，设计并实现了基于可见光通信的混合双工调试交互系统.针对调试交互系统下行链路中，环境光照度传感器感光延时导致数据传输率过低的问题，提出一种基于压缩表达的双头脉冲间隔调制CDH-PIM.针对调试系统上行链路中，感知节点通过光源发送数据无法与光学相机形成图像帧同步的问题，提出一种面向卷帘快门的反馈式帧同步机制.实验结果表明CDH-PIM相较于DH-PIM吞吐量提升11.09%，能耗降低8.70%.上行链路帧同步方案可在30fps条件下达到600b/s的数据传输率. |
| 关键词: 传感器节点 在线调试 可见光通信 调制 卷帘快门 帧同步 |
| DOI： |
| 分类号: |
| 基金项目:浙江省科技厅重大科技专项计划基金（2015C01033） |
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| Research on Online Debugging Interaction Based on Visible Light Communication for Wireless Sensor Nodes |
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LI Cheng-Lin1, ZHU Yun-Kai2, QIU Jie-Fan1, ZHENG Pan1, CHI Kai-Kai1
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1.College of Computer Science and Technology, Zhejiang University of Technology, Hangzhou 310023, China;2.Zhejiang Hangjia Technology Development Co. Ltd, Hangzhou 310015, China
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| Abstract: |
| Wireless sensor network nodes are deployed in the places that are difficult to reach and maintain. Once a failure of sensor nodes occurs, debugging interaction depends on the network infrastructure. However, some wireless communication malfunctions very lead to sensor nodes lost from the network. Traditional debugging interactions based on the networks become invalid. In addition, due to the low-cost hardware structure of the sensor node, it is hard to provide additional interactions. To this end, this paper mines the potentialities of visible light sensor and light emitting unit and realizes a mixed-duplex debugging interaction system (DIS) based on visible light communication. Moreover, for the downlink of DIS, the sensing delay of ambient light sensor decreases the data transmitting rate. A compressed dual-header pulse interval modulation to the increase data transmitting rate is presented. And also, for the uplink of DIS, the light emitting unit of sensor node cannot match the image frame of camera generation, so a frame synchronization applied in camera rolling shutter mechanism is presented. The experiment results illustrates that the throughput of CDH-PIM is 11.09% higher than that of DH-PIM, and the energy consumption is reduced by 8.70%. The uplink frame synchronization scheme can achieve a data transfer rate of 600 b/s at 30 fps. |
| Key words: sensor nodes online debugging visible light communication modulation rolling shutter frame synchronization |
