Optimal Modulation Technique for Underwater Visible Light Communication Using Rolling-Shutter Sensor
Optimal Modulation Technique for Underwater Visible Light Communication Using Rolling-Shutter Sensor
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DOI：
10.1109/access.2021.3123358
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发表时间：
2021
期刊：
影响因子：
3.9
通讯作者：
Ritsuki Hamagami;T. Ebihara;N. Wakatsuki;K. Mizutani
中科院分区：
文献类型：
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作者：
Ritsuki Hamagami;T. Ebihara;N. Wakatsuki;K. Mizutani
使用基于滚动快门传感器的商用相机的可见光通信(VLC)技术的优势在于，安装在水下设备(例如，无人机、传感器)上的LED和相机可以有效地分别用作水下的发射器(Tx)和接收器(Rx)。另一方面，还没有很好地考虑合适的调制技术来实现在包括高环境光条件的水下信道中使用滚动快门传感器的VLC系统。本文采用相移键控(PSK)、非归零开关键控(NRZ-OOK)和正交频分复用(Ofdm)设计了VLC系统，并通过仿真和实验对其进行了评估。结果表明，在低频环境光环境下，采用PSK或OOK的VLC系统比采用NRZ-OOK的VLC系统具有更强的抗噪声能力；在强环境光环境下，采用PSK或NRZ-OOK的VLC系统具有更强的容错性，从而导致像素饱和。综上所述，本研究表明，PSK是最适合在包含高环境光条件的水下信道中使用滚动快门传感器的VLC系统的调制技术。
The visible light communication (VLC) technique using a rolling-shutter sensor-based commercial camera has an advantage in that the LED and camera mounted on an underwater device (e.g., drone, sensor) can be effectively used as a transmitter (Tx) and a receiver (Rx), respectively, under water. On the other hand, a suitable modulation technique has not been well considered to realize a VLC system using a rolling-shutter sensor in an underwater channel that includes high ambient light conditions. In this paper, we design VLC systems using phase-shift keying (PSK), non-return-to-zero on- off keying (NRZ-OOK), and orthogonal frequency division multiplexing (OFDM), and evaluate them through simulations and experiments. The results suggested that the VLC system using PSK or OFDM is more resilient than that using NRZ-OOK in an underwater channel with low-frequency ambient light, and that a VLC system using PSK or NRZ-OOK is more tolerant than that using OFDM in environments with high ambient light, resulting in pixel saturation. In conclusion, the present study has demonstrated that PSK is the most suitable modulation technique for a VLC system using a rolling-shutter sensor in an underwater channel that includes high ambient light conditions.