摘要
白光LED不仅可以用来照明还可以作为通信系统的光源,近年来随着光电器件性能的提高,室内可见光通信系统的研究成为热点。但照明用白光LED受自身器件特性限制,有效带宽仅为1MHz,为了在有限的带宽内提高通信速度和通信质量,设计了一种预失真的四进制辐移键控(4ASK)调制方案。在系统的发射端采用RC均衡和预失真电路,用以缓解LED带宽不足的情况;通过模拟实验得到最优化的参数后,搭建了可见光通信(VLC)传输系统的硬件电路。实验结果表明,在1m的传输距离内,系统最快传输速率可达到20MHz/s,误码率(BER)小于10-6。
The white LED is used not only for lighting, but also as the light source in communication sys terns. In recent years,as the performance of the optoelectronic devices improves, the indoor visible light communication system has attracted much attention of researches. But the efficient bandwidth of white LED used for illumination is around I MHz due to its device characteristics. To improve the rate and the quality of the communication, a demodulation scheme is designed based on pre-distorted 4 amplitude shift keying （4ASK） and the visible light communication transmitting system is constructed. To relieve the LED＇s bandwidth deficiency, the RC equalization and pre-distorted circuit are used at transmitting termi- nal of the visible light communication system. The optimization parameters are got by simulation. The hardware circuit of the visible light communication system is built. The experimental results show that the maximum bit rate is up to 20 Mbit/s,the bit error rate （BER） is less than 10-6 ,and the communi- cation distance is about 1m.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2014年第8期1502-1505,共4页
Journal of Optoelectronics·Laser
