离散多音频技术在可见光通信中的应用

Discrete Multi-tone Technique Application on Visible Light Communication

针对室内300~800lx白光LED照明环境,建立了一种基于离散多音频调制技术(DMT)的可见光通信(VLC)系统模型,在多径传输信道模型中对其性能指标进行评估。在400lx光照强度下,误码率为10-3和10-6时,使用DMT调制技术数据传输速率分别为260Mbit/s和220Mbit/s,相对于相同条件下多脉冲幅度调制(M-PAM)基带传输系统分别提高了44.4%和37.5%。分析结果证明,可见光通信系统中,离散多音频调制技术不仅能对抗可见光通信中的码间串扰和热噪声,而且在有限带宽限制下显著提高了数据传输速率。

In the 300 ~ 800lx white light LED indoor lighting environment, a visible light communication(VLC) system is set up based on discrete multi-tone modulation technology(DMT) and its performance in a multi-path transmission channel model is evaluated. When the illuminance of environment brightness is 400lx and the bit error rate are 10-3 and 10-6, the data transfer rate are 260Mb/s and 220Mb/s, increased by 44.4% and 37.5% relative to the multi-pulse amplitude modulation(M-PAM) base band transmission system under the same conditions. The analysis results show that, discrete multi-tone modulation technology can not only resist to inter-symbol interference and noise in communication channels, but also significantly increase the data transmission speed in the limited bandwidth.