Demonstration of 575-Mb/s downlink and 225-Mb/s uplink bi-directional SCM-WDM visible light communication using RGB LED and phosphor-based LED
Demonstration of 575-Mb/s downlink and 225-Mb/s uplink bi-directional SCM-WDM visible light communication using RGB LED and phosphor-based LED
复制标题
使用 RGB LED 和荧光粉 LED 演示 575 Mb/s 下行链路和 225 Mb/s 上行链路双向 SCM-WDM 可见光通信
DOI：
10.1364/oe.21.001203
复制
发表时间：
2013-01-14
期刊：
影响因子：
3.8
通讯作者：
Shang, Huiliang
中科院分区：
文献类型：
--
作者：
Wang, Yuanquan;Wang, Yiguang;Shang, Huiliang
我们提出并实验证明了一种新型的全双工双向副载波复用（SCM）-波分复用（WDM）可见光通信（VLC）系统，该系统基于商用红绿蓝（RGB）发光二极管（LED）和基于磷光体的LED（P-LED），具有575 Mb/s的下行和225 Mb/s的上行传输，采用正交幅度调制（QAM）正交频分复用（OFDM）的各种调制阶数。对于下行链路，红色和绿色颜色/波长被分配以携带有用的信息，而蓝色芯片仅保持发光以维持白色颜色照明，并且对于上行链路，实现低成本的P-LED。在本演示中，还采用了预均衡和后均衡来补偿LED的严重频率响应。使用该方案，可以实现4个用户的下行链路和1个用户的上行链路传输。此外，它可以支持更多的用户通过调整每个子信道的带宽。在66 cm自由空间传输后，所有链路的误码率（BER）均低于3.8 x 10（-3）的前向纠错（pre-FEC）阈值。结果表明，该方案在实际VLC系统中具有很大的应用潜力。(C)2013年美国光学学会
We propose and experimentally demonstrate a novel full-duplex bi-directional subcarrier multiplexing (SCM)-wavelength division multiplexing (WDM) visible light communication (VLC) system based on commercially available red-green-blue (RGB) light emitting diode (LED) and phosphor-based LED (P-LED) with 575-Mb/s downstream and 225-Mb/s upstream transmission, employing various modulation orders of quadrature amplitude modulation (QAM) orthogonal frequency division multiplexing (OFDM). For the downlink, red and green colors/wavelengths are assigned to carry useful information, while blue chip is just kept lighting to maintain the white color illumination, and for the uplink, the low-cost P-LED is implemented. In this demonstration, pre-equalization and post-equalization are also adopted to compensate the severe frequency response of LEDs. Using this scheme, 4-user downlink and 1-user uplink transmission can be achieved. Furthermore, it can support more users by adjusting the bandwidth of each sub-channel. Bit error rates (BERs) of all links are below pre-forward-error-correction (pre-FEC) threshold of 3.8 x 10(-3) after 66-cm free-space delivery. The results show that this scheme has great potential in the practical VLC system. (C) 2013 Optical Society of America