Hu Chao, Chen Chen, Guo Min, Yang Yanbing, Luo Jun, Chen Liangyin
Opt Lett. 2020 Sep 1;45(17):4927-4930. doi: 10.1364/OL.403914.
In this Letter, we propose and demonstrate a practical optical-spatial-summing-based non-orthogonal multiple access (OSS-NOMA) technique for visible light communication (VLC) systems. This technique is innovative in adopting OSS in that the transmitter of OSS-NOMA VLC can be built upon commercial illuminating light emitting diodes (LEDs), free of LEDs' harmful nonlinearity. Unlike conventional NOMA VLC using analog components such as digital-to-analog converters and bias-T in the transmitter side, OSS-NOMA exploits only digital control signals to drive a LED array in forming optical power superposition for NOMA signals. We demonstrate that by simply switching different amounts of LED chips on or off, the proposed OSS-NOMA transmitter can deliver a fine-grained power allocation ratio ranging from 0.01 to one for two users. The implemented OSS-NOMA VLC prototype leveraging commercial components can achieve low bit error rates of ≤3.1×10 for two users at a data rate of 800 kbps, confirming the promising potential of this novel OSS-NOMA VLC for Internet of Things (IoT) applications.
在本信函中，我们提出并演示了一种用于可见光通信（VLC）系统的基于光空间求和的实用非正交多址接入（OSS-NOMA）技术。该技术在采用光空间求和方面具有创新性，因为OSS-NOMA VLC的发射机可以基于商用照明发光二极管（LED）构建，不受LED有害非线性的影响。与在发射机端使用数模转换器和偏置三通等模拟组件的传统NOMA VLC不同，OSS-NOMA仅利用数字控制信号来驱动LED阵列，以形成用于NOMA信号的光功率叠加。我们证明，通过简单地打开或关闭不同数量的LED芯片，所提出的OSS-NOMA发射机可以为两个用户提供范围从0.01到1的细粒度功率分配比。利用商用组件实现的OSS-NOMA VLC原型在800 kbps的数据速率下，可为两个用户实现≤3.1×10的低误码率，证实了这种新型OSS-NOMA VLC在物联网（IoT）应用中的广阔前景。
