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由于医院、飞机等特殊场合对电磁波比较敏感,传统的无线电通信方式不适合此类场所,本文根据VLC原理,对大气信道进行建模分析的基础上,设计开发了一套室内点对点VLC通信平台。系统采用IM/DD调制方式,通信链接为直射式LOS链接,通过合理设计发射端光源LED的调制驱动电路、接收端探测电路、放大器电路,选用0.5W功率的LED灯珠,在室内白天强背景光干扰及室内灯光干扰状态下,实现了室内0.3m的无失真稳定的信息传输,验证了基于白光LED的可见光通信系统的可实现性;同时采用本系统对室内环境参量进行了实时监测传输,系统传输性能稳定、可靠,验证了基于白光LED可见光通信系统在室内的可实用性。
Due to the sensitivity to electromagnetic waves in special occasions such as hospitals and airplanes, the traditional radio communication methods are not suitable for such places. Based on the VLC principle and modeling and analysis of atmospheric channels, an indoor point-to-point VLC communication platform is designed and developed. The system uses IM / DD modulation mode, the communication link is direct LOS link, through the reasonable design of the transmitter driver LED modulation circuit, the receiver detection circuit, the amplifier circuit, the selection of 0.5W power LED lamp beads, Light interference and indoor lighting interference, the realization of indoor 0.3m distortion-free transmission of information to verify the feasibility of the visible light communication system based on white LED; at the same time using the system of indoor environmental parameters of real-time monitoring transmission, System transmission performance is stable and reliable, which verifies the practicability of indoor white light LED visible light communication system.