Publication

Abstract : Precise indoor positioning is a widely researched topic currently. Many existing or new radio devices and standards are being explored for this purpose. Existing infrastructure or technology is always advantageous as it might reduce the cost and at the same time can be used for other purposes. The emerging visible light communication (VLC) is another technology being researched for precise positioning, especially in the indoor environment. VLC can be designed on existing infrastructure or slightly modified systems, and positioning using VLC would find usage in real-life scenarios. In this positioning system, an object whose location needs to be determined must have a VLC receiver. In this work, a comparative study is performed for popular algorithms through simulation as well as hardware demonstration. Thorough analysis and simulation are performed for circular lateration, hyperbolic lateration, differential detection, and angulation; the hardware implementation and demonstration as a proof of concept (POC) is completed for circular lateration and differential detection. Both these models use received signal strength (RSS) to calculate distances. We use a single photodetector for implementing circular lateration whereas two photodetectors for demonstrating differential technique. We observe that the differential detection performs relatively better compared to circular lateration, that is, the error is reduced in differential detection.