滚动快门OCC中的符号速率最大化：设计与实现考虑
Symbol Rate Maximization in Rolling-Shutter OCC: Design and Implementation Considerations
AI总结：
本文提出了一种基于滚动快门相机模型的OCC系统，通过等效数字通信模型实验验证了最大符号速率，并通过线性均衡器补偿ISI，实现Nyquist采样率下的OCC系统工作。
摘要：
光学相机通信（OCC）系统可以利用滚动快门相机逐行扫描的过程来捕捉来自可见光通信（VLC）LED发射机的快速光强变化。为了研究此类OCC系统能够实现的最大数据率，本文提出了其等效数字通信系统模型，在该模型中，将滚动快门相机建模为一个矩形匹配滤波器，其时间宽度等于相机的曝光时间，随后在相机的像素行扫描速率下进行采样。基于提出的滚动快门相机模型，证明了此类OCC系统所能支持的最大符号速率，并通过干扰符号间干扰（ISI）的形式表征了VLC发射机与滚动快门OCC接收机之间不完美时间同步的影响。由此过程产生的等效三tap信道模型经实验验证，通过使用线性均衡器对生成的ISI进行补偿。仿真和实验结果显示出强烈的相关性，证明了所提出的方法可以使OCC系统在奈奎斯特采样率下工作，这相当于接收端所用滚动快门相机的像素行扫描速率。
英文摘要：
Optical Camera Communication (OCC) systems can take advantage of the row-by-row scanning process of rolling-shutter cameras to capture the fast variations of light intensity coming from Visible Light Communication (VLC) LED-based transmitters. In order to study the maximum data rate that is feasible in such kind of OCC systems, this paper presents its equivalent digital communication system model in which the rolling-shutter camera is modeled as a rectangular matched-filter whose time width is equal to the exposure time of the camera, followed by a sampling process at the pixel row sweep rate of the camera. Based on the proposed rolling-shutter camera model, the maximum symbol rate that such OCC systems can support is experimentally demonstrated, and the impact of imperfect time synchronization between the VLC transmitter and the rolling-shutter OCC receiver is characterized in the form of Inter-Symbol Interference (ISI). The equivalent three-tap channel model that results from this process is experimentally validated and the generated ISI is compensated with the use of linear equalization in reception. Simulation and experimental results show a strong correlation between them, demonstrating that the proposed approach can be used to make the OCC system work at the Nyquist sampling rate, which is equivalent to the pixel row sweep rate of the rolling-shutter camera used in reception.
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