针对现有基于低压汞蒸气灯“日盲”紫外光通信系统通信速率低、驱动电压高、光源响应速度慢、电光转换效率低和功耗过高等问题,提出并设计了一套基于LED的“日盲”紫外光通信系统。该系统以深紫外LED作为光源,用光电倍增管探测微弱光信号,采用脉冲位置调制(PPM)技术和最大似然解调技术,并用现场可编程门阵列完成了调制解调部分的设计与仿真。实验表明,采用深紫外LED和PPM技术,可以大幅度提高系统的通信速率、电光转换效率,同时显著降低驱动电压和系统功耗。 Aiming at the problems of low communication speed, high driving voltage, slow response speed of light source, low electro-optic conversion efficiency and high power consumption based on the existing low-pressure mercury vapor lamp “solar blind ” ultraviolet communication system, “Blind ” UV communication system. The system uses deep ultraviolet LED as light source, detects weak optical signal by using photomultiplier tube, adopts pulse position modulation (PPM) technology and maximum likelihood demodulation technique, and completes the design and simulation of modulation and demodulation using field programmable gate array. Experiments show that the use of deep UV LED and PPM technology, can greatly improve the system’s communication rate, electro-optical conversion efficiency, while significantly reducing the drive voltage and system power consumption.