基于可见光通信的在线调试方法研究

Research on Online Debug Method Based on Visible Light Communication

无线传感器节点部署到人无法触及的区域后,当无线通信故障时,其无法通过依赖于无线通信的调试交互来修复丢失的节点。可见光通信(Visible Light Communication,VLC)作为无线电波通信的补充,具有单向传播特性,可以提高物理层的传输安全性。基于此,利用智能手机和传感器节点实现了基于VLC的混合通信调试系统。在该系统中,下行链路以智能手机作为VLC网关,通过闪光灯将调试代码发送到传感器节点。为了提高下行链路的传输效率,研究新的信源编码方法,在分析二进制指令的基础上,使用位掩码技术压缩操作数,使得传输数据量下降了80%。对于混合通信调试系统的上行链路,使用传感器节点的板载LED将反馈调试信息传输到智能手机。同时,设计一种新型DH-PIM编码格式来优化上行链路的传输质量。实验表明,优化后的上行传输时间和误码率相比原始DH-PIM大幅降低。

Once the sensor networks are deployed in untouchable area and lost,the network owner is hard to debug and fix them via the existing wireless communication infrastructure.Visible Light Communication(VLC)can be taken as available complementary way for network debug.The unidirectional propagation characteristic of VLC also improve the security of debug from physical layer.For this,this paper realizes a duplex VLC-based mixed debug system using smart-phone and sensor nodes.In this system,the smartphone as VLC gateway sends debugging code using flashlight and forms downlink.To improve the transmission efficiency,we propose the novel source coding method.For this method,we analyze the binary instructions and compress the operand by masking technology.The transmission data is reduced by 80%.We further realize the uplink of the system using node-boarding LED and camera of smartphone.At the same time,we also change the coding format of DH-PIM to optimize the transmission quality of uplink.The experiment illustrates its outperformance.