Lighting Extra Data via OWC Dimming
Lighting Extra Data via OWC Dimming
复制标题
通过 OWC 调光照明额外数据
DOI：
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
Li Xiao
中科院分区：
文献类型：
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作者：
Xiao Zhang;Li Xiao
大多数OWC系统使用led作为发射器，在恶劣的信道条件下，采用或切换到最强大的开关键控（OOK）调制，而复杂的高阶调制方案在恶劣的光学环境中容易受到更多错误位的破坏。然而，OOK的数据速率受限于其低密度调制设计和使用补偿符号来支持调光控制。在本文中，我们提出识别数据流中经常出现的位模式，并将每个位模式映射为补偿符号（CS），以便携带更多的数据位，以提高数据速率和吞吐量。我们还设计了无闪烁的光学符号和CS重新定位方案，以支持平滑的照明和通信。实验表明，我们提出的方法在保持低误码率的同时，使系统吞吐量提高了一倍，与高阶调制（8-CASK和32-CSK）的改进水平相同。
Most OWC systems use LEDs as transmitters and in poor channel conditions adopt or switch to the most robust On-Off Keying (OOK) modulation from complex high-order modulation schemes that are fragile with more error bits in poor optical environments. However, the data rate of OOK is limited to its low-density modulation design and its use of compensation symbols to support light dimming control. In this paper, we propose to identify bit patterns frequently occurred in the data stream, and map each bit pattern with a compensation symbol (CS) for which to carry more data bits for improved data rate and throughput. We also design non-flicker optical symbols and CS relocation schemes to support smooth lighting and communication. Experiments show that our proposed approach double the system throughput, the same improvement level as high-order modulations (8-CASK and 32-CSK) while maintaining low BER.