A received signal strength-based visible light positioning system with multiple light sources is investigated. In this system, each light source is assigned a unique signature code, which is constructed based on the vertex coloring of graph theory. The signature code is separated into three parts for different purposes, i.e., discriminating the beginning of the received signals, distinguishing different light sources, and correcting errors when they occur. The length of the code is determined by the numbers of the light sources. A sequential decoding scheme is devised to identify different light sources stepwisely. The light source with the highest received light intensity is discerned first by utilizing the characteristic of the signature codes. Then it is reduced from the received signals, and the remaining light sources are discriminated one by one using this scheme. With the knowledge of the coordination of these light sources, the location of the receiver can be acquired based on trilateration positioning algorithm. The simulation and the experiment results verify that the proposed signature codes can eliminate the interference from multiple sources and achieve good positioning performance.

中文翻译：

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基于多光源的可见光定位系统签名码的构建

研究了一种基于接收信号强度的多光源可见光定位系统。在该系统中，每个光源都被分配了一个唯一的签名代码，该代码是基于图论的顶点着色构造的。为了不同的目的，签名码被分成三个部分，即区分接收信号的开始，区分不同的光源，以及在它们发生时纠正错误。代码的长度由光源的数量决定。设计了一种顺序解码方案来逐步识别不同的光源。利用签名码的特性，首先识别出接收光强度最高的光源。然后从接收到的信号中减去，其余的光源使用该方案一一区分。有了这些光源协调的知识，就可以基于三边测量定位算法获取接收器的位置。仿真和实验结果验证了所提出的特征码能够消除多源干扰，实现良好的定位性能。