基于多基色LED和OFDM的可见光通信系统

发布时间：2018-08-20 17:18

【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。
[Abstract]:At present, the spectrum efficiency of the optical orthogonal frequency division multiplexing (OFDM) system based on single white LED is much lower than that of the traditional OFDM system. In order to improve the (SE), the broadband communication potential of multi-primary color LED is studied. Based on the analysis of classical optical OFDM modulation technology, a visible light communication (VLC) system based on multi-primary color LED and OFDM is proposed. M primary color LED is used as transmitter antenna, and binary data is modulated by OFDM. After modulation, multiple complex signals are converted into M-dimensional real vector signals by two-dimensional complex signals and polarity coding method. M primary color LED is driven to send out composite optical signal, and M front-end photodiode (PD) with different color filters is used to receive superimposed composite optical signal. The simulation results show that under the condition of additive Gao Si white noise and measured channel, the 2dB SNR (SNR) gain of the VLC system with asymmetric limiting optical OFDM (ACO-OFDM) is approximately higher than that of the classical asymmetric limiting optical OFDM (ACO-OFDM) system under the condition of the same symbol error rate.
【作者单位】：湖北文理学院物理与电子工程学院;
【基金】：2014襄阳市科学技术局项目(襄科计[2014]12号)资助项目
【分类号】：TN929.1

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