Exposure Synchronization in Optical Camera Communications for Time Division Multiplexing
Exposure Synchronization in Optical Camera Communications for Time Division Multiplexing
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DOI：
10.1109/jphot.2023.3247908
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发表时间：
2023-04
影响因子：
2.4
通讯作者：
Hiroaki Matsunaga;T. Yendo;Shintaro Arai;T. Yamazato
中科院分区：
文献类型：
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作者：
Hiroaki Matsunaga;T. Yendo;Shintaro Arai;T. Yamazato
光学相机通信（OCC）是一种采用相机作为接收器的可见光通信类型。已经提出了使用通用低帧速率相机的各种无闪烁OCC方法。特别是，欠采样方法使用短曝光相机和比相机的帧速率更快闪烁的发光二极管。尽管曝光时间短，但发射机必须发送一个符号达一个帧周期或更长，因为发射机的符号定时和接收机的曝光定时之间的关系是不确定的。我们建议解决这个不确定性同步曝光定时发射机。在所提出的方法中，发射机通过时分复用在一个帧周期内发送多个数据信道，并且接收机选择一个信道。然后，从帧中的单个像素值提取多级相移键控的单个符号。实验证实，即使在信噪比下降的情况下，曝光定时也可以同步，并且接收器可以选择所需的信道。在各种调制方式下，信噪比为46.2 dB时，该方法的误码率为10 ^{-6}$。
Optical camera communication (OCC) is a type of visible light communication that employs a camera as the receiver. Various flicker-free OCC methods using a general-purpose low-frame rate camera have been proposed. In particular, the undersampling method uses a short exposure camera and a light-emitting diode that blinks faster than the camera's frame rate. Despite the short exposure time, the transmitter has to send a symbol for a frame period or longer because the relationship between the symbol timing of the transmitter and exposure timing of the receiver is indeterminate. We propose resolving this indeterminacy by synchronizing the exposure timing to the transmitter. In the proposed method, the transmitter sends multiple data channels in a frame period by time division multiplexing, and the receiver selects a channel. Then, a single symbol of multilevel phase shift keying is extracted from a single pixel value in a frame. Experiments confirmed that the exposure timing could be synchronized even with a degraded signal–noise ratio and that the receiver could select the desired channel. The proposed method achieved a bit error rate of $10^{-6}$ at a signal–noise ratio of 46.2 dB under various modulation schemes.