时间混合调制无载波幅度相位可见光通信系统

A Time-based Hybrid Modulation Carrier-less Amplitude Phase Visible Light Communication System

许多研究人员已经将基于发光二极管的可见光通信(VLC)与照明通信相结合,然而VLC系统的性能主要受限于系统带宽和信噪比(SNR),之前的实验并没有充分利用信道资源,特别是SNR资源。针对SNR资源利用问题,文章提出了一种基于时间的混合调制无载波幅度相位VLC系统,在该系统中,信号的实际调制级别不仅可以是一个整数,而且可以是一个十进制数,通过按一定的比例对比特进行分组,可以提高信道的SNR资源利用率。通过仿真和实验验证了该系统的可行性和有效性。实验结果表明,当驱动信号的峰峰值电压范围为0.65～0.86V时,可以获得约10%的比特率改善。

Light Emitting Diode(LED)-based Visible Light Communication(VLC),combining with communication with illumination,has been attracted much attention recently.The performance of VLC system is mainly subjected to the limited system bandwidth and Signal-to-Noise Ratio(SNR).However,the previous studies do not make full use of channel resources,especially the SNR resources.In this paper,for the issue of utilization of SNR resource,a time-based hybrid modulation carrier-less amplitude phase(CAP)VLC system is proposed.In this system,the real modulation level of the signal can both be an integer a decimal number,which increases utilization of the SNR resources of the channel by grouping bits by a certain ratio.The feasibility and effectiveness of this system are verified through both simulation and experiment.The bit rate can be improved by^10%when peak-to-peak voltage of driving signal ranges from 0.65 V to 0.86 V in experimental demonstration.