一种基于变周期调制的白光通信系统设计与实现  

Design and implementation of a white light communication system based on variable period modulation

作　　者：冯祎[1] FENG Yi(Information Institute,North China University of Technology,Beijing 100144,China)

机构地区：[1]北方工业大学信息学院电子实验中心,北京100144

出　　处：《光通信技术》2020年第1期49-53,共5页Optical Communication Technology

基　　金：北方工业大学教育教学改革重点项目(108051360019XN141/015)资助;北京市自然科学基金-海淀原始创新联合基金项目(重点研究课题L182039)资助。

摘　　要：白光发光二极管(LED)的响应速度,会影响通信链路的调制带宽,更直接限制了白光通信系统的数据传输速率。为了提高在调制带宽受限时的通信速率,设计了一种变周期调制的白光通信系统。系统发送端由微控制器产生数据源,采用现场可编程门阵列(FPGA)对数据进行组帧、调制,经驱动电路及LED光源发送。系统接收端的FPGA对经过光电二极管及信号调理电路输出的数字信号进行解调。实验结果表明:相对于开关键控、脉冲位置调制和差分脉冲位置调制等数字基带调制方式,系统有效地提高了数据传输速率。The response speed of the white light emitting diodes(LED)affects the modulation bandwidth of the communication link and directly limits the data transmission rate of the white light communication system.In order to improve the communication rate when the modulation bandwidth is limited,a variable-period modulation white light communication system is designed.The data source is generated by the microcontroller at the transmitting end of the system,and the data is framed and modulated by a field programmable gate array(FPGA),and transmitted through the driving circuit and the LED light source.The FPGA at the receiving end of the system demodulates the digital signal output through the photodiode and the signal conditioning circuit.The experimental results show that the system effectively increases the data transmission rate compared to digital baseband modulation such as on-off keying,pulse position modulation,and differential pulse position modulation.

关 键 词：白光通信 变周期调制 数字基带调制 现场可编程门阵列 

分 类 号：TN929.12[电子电信—通信与信息系统]