基于FPGA的LED交通灯可见光通信系统

LED Traffic Lamp Visible Light Communications System Based on FPGA

在LED交通灯通信系统中,为了降低误码率和提高通信距离,将脉冲位置调制(PPM)技术应用在智能交通光通信系统中,并且在原有的调制技术上增加了同步帧头便于确定信息位的到来,从而实现在复杂环境下的LED交通灯与车辆的高质量通信要求。在此基础上利用Matlab对改进PPM进行仿真,使用Verilog语言进行硬件编程,运用ISE软件进行仿真,搭建外围硬件平台进行室外实验验证。实验结果表明:该系统在室外光照强度为1.1×10~5 1x的环境下,实现了传输距离达到4 m并且误码率低于10^(-3)。

In order to reduce the bit error ratio（BER） and improve the communication distance in the LED traffic lamp communication system, the pulse position modulation （PPM） technology is applied to the intelligent transportation system, and the synchronization frame is added to the original modulation technology to determine the arrival of information bits then to achieve the high quality communication requirements between LED traffic lights and vehicles in a complex environment. On this basis, Matlab is used to simulate the improved PPM, u- sing Verilog for hardware programming, ISE software to simulate, and a peripheral hardware platform for out- doors experiment verification is built. The results show that the system achieves the transmission distance of 4 m and the BER is less than 10-3 in the environment of outdoor light intensity being 1.1 ×10^5lx.