Visible Light based Positioning by Continuous Frequency-Modulated LEDs in Combination with Fingerprinting

This work proposes an indoor positioning solution to achieve positioning in a low complex way. Our solution approach is based on frequency-modulated light sources without the need for complex modulation and encoding schemes. By utilizing a least-square approximation, the composition of the frequency spectrum of the impinging light on a receiver unit is calculated. Based on the generation of the ratio between the different modulation frequencies, a positioning algorithm is implemented that fulfills the task of positioning without the need for complex calculations. Utilizing a simulation environment, which is based on MATLAB, Simulink, and Simscape, we can precisely simulate the proposed scenario in order to generate the offline map for performing fingerprinting. By experimental results, we verify our proposed low complex solution, showing that our system can be realized with off-the-shelf components and without the necessity of specialized hardware for controlling the light sources or in the receiver design.