基于蓝光LED的水下远距离通信系统设计

Design of underwater long-distance communication system based on blue LED

为满足水下远距离、高速率、低误码、高性能的通信要求,该文设计了一套低功耗、小型化的水下无线光通信系统。以蓝光LED阵列作为光源既提高了输出功率又增大了发射视角,以光电倍增管(PMT)作为探测器、极大提高了接收增益,整个收发系统以FPGA为基础,实现了数据的RS编解码,同时加入8B/10B编码以解决OOK调制的均衡问题,内部电路的优化处理提高了系统整体性能,外部结构设计控制收发视角以提高系统的能量传输效率。经水池实验测试,该系统可实现水下距离50 m,通信速率100 kb/s、误码率(BER)低于10^(-6)的稳定通信,为后续水下远距离无线光通信的发展奠定了基础。

In order to meet the communication requirements of underwater long-distance,high-speed,low-error code and high-performance communication,this paper designs a low-power,miniaturized underwater wireless optical communication system.The blue LED array is used as the light source to improve the output power and increase the transmitting angle of view,the photomultiplier tube(PMT)is used as the detector to greatly improve the receiving gain,the whole transceiver system is based on FPGA to realize the RS coding and decoding of the data,while adding 8B/10B coding to solve the equalization problem of OOK modulation,the internal circuit optimization process to improve the overall performance of the system,and the external structure design controls the transceiver perspective,which improves the energy transmission efficiency of the system.After the pool experimental test,the system can realize stable communication with underwater distance of 50 m,communication rate of 100 kb/s and bit error rate(BER)lower than 10^(–6),which lays a foundation for the development of underwater long-distance wireless optical communication.