Optical camera communication is foreseen to have an essential role in future systems requiring wireless communication capability. In this regard, high-spectral-resolution cameras, such as multispectral (MS) cameras, present specific characteristics that can be exploited to provide new features to optical camera communication links. Using the MS cameras' features to take advantage of the light-emitting diode (LED) behaviour in a novel communication scheme is focussed. Notably, LED spectral response curves are different when their temperature changes. Therefore, these differences can be detected based on the MS cameras' spectral resolution. Thus, more than one communication channel can be attained using the same LED device since the camera can distinguish the different LED spectral signatures. This new approach is analysed in this work, including some equalisation techniques applied to the channel matrix in the receiver to improve the extraction of the transmitted signal reducing the inter-channel interference. For the specific MS camera employed in the experiments, up to two distinct channels could be obtained with the same transmitter at different temperatures, getting a bit error rate below the forward error correction limit. However, obtaining satisfactory results is highly dependent on the variation that temperature causes in the spectral signatures of the LEDs, so further experiments are recommended in future work with different devices.

中文翻译：

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基于光谱特征复用的多光谱光学相机通信链路

预计光学相机通信将在未来需要无线通信能力的系统中发挥重要作用。在这方面，高光谱分辨率相机，例如多光谱（MS）相机，呈现出可用于为光学相机通信链路提供新功能的特定特性。重点是利用 MS 相机的功能来利用新型通信方案中的发光二极管 (LED) 行为。值得注意的是，LED 的光谱响应曲线在温度变化时会有所不同。因此，这些差异可以根据 MS 相机的光谱分辨率来检测。因此，由于相机可以区分不同的 LED 光谱特征，因此可以使用同一 LED 设备获得多个通信通道。这项工作分析了这种新方法，包括应用于接收器中的信道矩阵的一些均衡技术，以改善传输信号的提取，减少信道间干扰。对于实验中使用的特定 MS 相机，使用同一发射机在不同温度下可以获得最多两个不同的通道，从而获得低于前向纠错极限的误码率。然而，获得满意的结果在很大程度上取决于温度导致 LED 光谱特征的变化，因此建议在未来使用不同的设备进行进一步的实验。使用同一发射机在不同温度下可以获得最多两个不同的通道，从而使误码率低于前向纠错极限。然而，获得满意的结果在很大程度上取决于温度导致 LED 光谱特征的变化，因此建议在未来使用不同的设备进行进一步的实验。使用同一发射机在不同温度下可以获得最多两个不同的通道，从而使误码率低于前向纠错极限。然而，获得满意的结果在很大程度上取决于温度导致 LED 光谱特征的变化，因此建议在未来使用不同的设备进行进一步的实验。