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紫外光通信技术具有低窃听、低位辨、全方位、全天候、抗干扰等优点,而基于紫外光灯的通信系统存在光源体积大、易碎、调制困难、通信速率低、功耗大等问题。设计了一种基于紫外C波段(UVC)LED的小型化无线通信系统方案,并对系统性能进行了理论分析。系统光源采用UVC LED,探测器采用日盲光电倍增管(PMT)和窄带紫外滤光片,通信系统采用开关键控(OOK)和脉冲位置调制(PPM)调制方案。仿真结果表明所设计的紫外无线通信系统可在200mW发射光功率情况下实现直径200m范围内的非视距语音通信和100mW发射光功率情况下实现250m的64Kbps准视距通信。
Ultraviolet light communication technology has the advantages of low eavesdropping, low discrimination, all-around, all-weather, anti-interference and so on. However, the communication system based on the ultraviolet light lamp has the problems of bulky light source, fragile modulation, low modulation rate, A scheme of miniaturized wireless communication system based on ultraviolet C-band (UVC) LED was designed and its performance analyzed theoretically. The UVC LED was used as the light source of the system. The detector was equipped with PMT (blind photomultiplier tube) and narrow-band UV filter. The communication system used on-off keying (OOK) and pulse position modulation (PPM) modulation scheme. The simulation results show that the designed UV wireless communication system can achieve non-line-of-sight (NLOS) 200m diameter and 200kW (64Kbps) NLOS with 200mW transmit power and 100mW transmit power.