摘要
针对可见光通信(VLC)技术存在数据传输速率低、收发端同步困难等问题,提出一种以彩色发光二极管(LED)阵列为发射端、手机摄像头为接收端的光学相机通信(OCC)系统。首先,设计了一种特殊的帧结构来解决系统收发端同步问题,并通过建立图像处理算法提取出彩色LED各通道灰度统计特性以区分LED颜色;然后,引入反向传播神经网络分类器提高颜色识别准确率;最后,以m伪随机序列作为测试数据进行系统通信误码率的测量,研究发射端LED阵列刷新率、相机偏转角、传输距离、LED颜色数对误码率的影响。实验结果表明:所设计的帧结构可以确保信息传输的稳定性;当使用8种颜色进行信息传输时,该系统可以在20~30 cm内实现误码率为10^(-6)量级、通信速率为4.824 kb/s的实时通信。
Aiming at the problems of low data transmission rate and difficulty in synchronization between receiver and transmitter in visible light communication(VLC)technology,an optical camera communication(OCC)system with color light-emitting diode(LED)array as transmitter and mobile camera as receiver is proposed.Firstly,a special frame structure was designed to solve the synchronization problem of the receiving and sending ends of the system,and an image processing algorithm was established to extract gray statistical characteristics of each channel of color LED to distinguish the color of LED.Then,the back propagation neural network classifier is introduced to improve the color recognition accuracy.Finally,the m pseudo-random sequence is used as the test data to measure the system communication bit error rate,and the impact of the transmitter refresh rate,camera deflection angle,transmission distance,LED color number on the bit error rate is studied.The experimental results show that the designed frame structure can ensure the stability of information transmission.The system can realize real-time communication with bit error rate of 10^(-6) magnitude and communication rate of 4.824 kb/s within 20~30 cm.
作者
胡延静
蔡喜平
卢钰松
程贵东
HU Yanjing;CAI Xiping;LU Yusong;CHENG Guidong(School of Physical Science and Technology,Heilongjiang University,Harbin 150080,China)
出处
《光通信技术》
2023年第1期31-39,共9页
Optical Communication Technology
关键词
可见光通信
光学相机通信
发光二极管阵列
多输入多输出技术
颜色编码
visible light communication
optical camera communication
light-emitting diode array
multiple-input multiple-output technology
color coding
