一种光通信数字图像传输系统的设计与实现

本文以光通信数字图像传输为目标,基于FPGA设计了一种可见光通信数字图像传输系统。首先,在光通信系统发射端利用数字图像编码技术将图片信息转换为BMP图像编码格式,然后通过UART串口通信协议将图像数据发送至FPGA调制系统进行OOK调制,经功率放大后以光通信方式进行传输。其次,在接收端将接收到的图像数据进行非相干解调,将解调后的图像数据在接收端显示或进行后续处理。在此基础上,基于FPGA对光通信的调制、解调电路及紫光LED通信电路进行了设计,并利用System Verilog语言进行了实现。最后,对光通信图像传输系统进行了实验测试,实验结果表明该系统可以在满足通信速率与误码率的条件下,实现图片信息的有效传输。

Design and implementation of a digital image transmission system basing on light communication

In this paper, for the purpose of transmitting digital images via light communication, a visible light communication digital image transmission system basing on FPGA is designed. First of all, in terms of the digital image encoding technique, the content of an image is converted into BMP file format at the transmitting end of the optical communication system. Then, the dataset of a digital image is transmitted to the FPGA modulation system for OOK modulating and in this procedure, transmission is based on UART protocol. After modulation, the modulated signal is power amplified before being sent out via optical wireless communication. Secondly, the received dataset of the image is demodulated non-coherently at the receiving end of the optical communication system so that it can be displayed or further processed. Furthermore, basing on the FPGA, the modulation and demodulation circuits of optical communication and violet LED communication circuits are designed and software algorithms are implemented via System Verilog. Finally, the whole system was tested and the experimental results proved that in the condition of satisfying communication speed and BER, the feasibility of effective transmission of image information could be verified.