摘要
针对移动场景下高速可见光通信中存在信号衰减快与系统带宽受限问题,创新设计了能够实现高速、稳定可见光通信系统的自适应均衡硬件电路。首先,从自适应控制接收信号衰减角度,提出一种面向移动可见光通信的自适应增益电路设计方案。其次,从补偿通信系统频响衰减角度,设计了一种模拟预均衡与后均衡电路。最后,基于所设计的电路搭建了可见光通信硬件测试平台。实验结果表明,将自适应均衡电路应用于可见光通信系统中,可以有效提高通信速率,还可有效克服移动过程中信号衰减与中断问题。
Visible light communication(VLC)has a broadband spectrum available without a license,which can effectively supplement the existing overcrowded spectrum to meet the demands of future high-speed wireless data transmission.However,achieving high-speed visible light communication still faces two key challenges:(1)The modulation bandwidth of VLC systems is limited,and common LED frequency responses have significant delays,which,to some extent,limit the LED modulation bandwidth.Moreover,the frequency domain response of LEDs severely attenuates at high frequencies,limiting their high-speed optical communication applications.(2)High-speed VLC systems require high alignment between the transmitter and receiver,and the movement of wireless terminals accelerates the attenuation of visible light signals,leading to communication interruption.Therefore,in response to the problems of fast signal attenuation and limited system bandwidth in high-speed VLC in mobile scenarios,hardware circuits that can achieve high-speed and stable VLC systems must be designed.As one of the important technologies for improving signal transmission quality and expanding system bandwidth,equalization can effectively solve the problem of frequency response attenuation in communication systems.Therefore,this study designed an analog pre-equalization and post-equalization circuit to improve the frequency response attenuation of VLC systems.Meanwhile,to further improve the reliability of VLC systems,soft equalization was introduced to reduce the bit error rate.In addition,due to the significant difference in signal amplitude received by the receiver at different positions illuminated by the light source,weak positions of the received signal may lead to a decrease in the system's data transmission rate and an increase in the bit error rate.To solve this problem,this study designed an improved adaptive amplification circuit composed of a variable attenuator,a detection circuit,and a gain voltage control circuit,which could automatically adjust the gain bas
作者
李宗艳
何凌燕
孙俊倡
张冠杰
马帅
方俊彬
李世银
LI Zongyan;HE Lingyan;SUN Junchang;ZHANG Guanjie;MA Shuai;FANG Junbin;LI Shiyin(School of Information and Control Engineering,China University of Mining and Technology,Xuzhou 221116,China;Peng Cheng Laboratory,Shenzhen 518055,China;The Department of Optoelectronic Engineering,Jinan University,Guangzhou 510632,China)
出处
《实验技术与管理》
CAS
北大核心
2024年第1期91-99,共9页
Experimental Technology and Management
基金
教育部供需对接就业育人项目(20230103784)
中国矿业大学教学学术研究重点子课题(2022ZDKT03-101)
中国矿业大学研究生教育教学改革研究与实践项目(2023YJSJG026)。
关键词
可见光通信
均衡电路
自适应放大电路
以太网通信
visible light communication
equalization circuit
adaptive amplification circuit
ethernet communication
