We propose and experimentally demonstrate a simple and elegant modulation format shifting (MFS) scheme by continuously changing the modulation formats between OOK and Manchester signal for optical camera communication (OCC) using a commercially available mobile phone. Leveraging the MFS scheme, extra data bits are delivered without reducing the pixel width of each bit, resulting in higher transmitted data rate. Meanwhile, multi-thresholding scheme is proposed for modulation format identification and signal decoding at the receiver. The experimental results demonstrate that the proposed MFS scheme can achieve a data rate of 8.16 Kbps with the bit error rate (BER) of $2.9\times 10^{-3}$ at the illuminance of 400 lux. In addition, compared with conventional OOK modulation, MFS scheme can remarkably improve the BER performance at the same data rate.

中文翻译：

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光学相机通信调制格式转换方案

我们提出并通过实验证明了一种简单而优雅的调制格式转换 (MFS) 方案，通过使用商用手机连续改变 OOK 和曼彻斯特信号之间的调制格式，用于光学相机通信 (OCC)。利用 MFS 方案，可以在不减少每个位的像素宽度的情况下传输额外的数据位，从而提高传输数据速率。同时，提出了多阈值方案用于接收端的调制格式识别和信号解码。实验结果表明，所提出的 MFS 方案在 400 lux 的照度下可以实现 8.16 Kbps 的数据速率，误码率 (BER) 为 $2.9\times 10^{-3}$。此外，与传统的OOK调制相比，MFS方案在相同数据速率下可以显着提高BER性能。