摘要
目前,基于单白光LED的光正交频分复用(OFDM)系统结构的频谱效率(SE)成倍低于传统OFDM系统,为了提高SE,对多基色LED的宽带通信潜能进行了研究,在综合分析经典光OFDM调制技术的基础上,提出一种基于多基色LED和OFDM的可见光通信(VLC)系统。系统发射机采用M基色LED作为发射天线,并采用OFDM对二进制数据进行调制,调制后的多个复信号再通过二维复信号转M维实向量信号的方法和极性编码方法,驱动M基色LED发出复合光信号,接收机采用M个前端设置有不同颜色滤波器的光电二极管(PD)接收叠加复合光信号。仿真结果表明,在相同误符号率情况下,本文系统在加性高斯白噪声环境和实测信道条件下比经典的非对称限幅光OFDM(ACO-OFDM)的VLC系统大约有2dB的信噪比(SNR)增益。
In order to investigate the potential broadband communication performance of multi-prime color light-emitting diode （LED）, a visible light communication （VLC） system based on multi-prime color LED and orthogonal frequency division multiplexing （OFDM） is proposed. In the proposed system, the transmitter adopts M-prime color LEDs as the transmitting antenna and uses OFDM technology to mod- ulate the binary data. By the method of two-dimension （2-D） to M-dimension （M-D） real vector and bi- polar encoding scheme,the modulated complex signals are converted into an M-D vector signal and then it drives M-prime color LEDs to emit compound light signals. The receiver adopts M photo diodes with different color filters in the front end to receive the compound optical signals. The simulation results show that under the same symbol error rate,the new system has about 2 dB signal-to-noise ratio （SNR） gain than the classic asymmetrically clipped optical OFDM （ACO-OFDM） VLC system in additive white Gaussian noise （AWGN） and measured channel.
出处
《光电子．激光》
EI
CAS
CSCD
北大核心
2017年第6期611-617,共7页
Journal of Optoelectronics·Laser
基金
2014襄阳市科学技术局项目(襄科计[2014]12号)资助项目
