Location awareness using Angle-of-arrival based circular-PD-array for visible light communication

LEDs (Light Emitting Diodes) are considered by many researcher to represent the next-generation lighting technology. Furthermore indoor LED lighting has a potential to converge with IT technology such as Visible Light Communication (VLC) based Location Awareness. In this paper, we suggest Angle of Arrival (AOA) estimation algorithm under VLC environment in order to find out the location of a light source (LED) using circular-PD-array. We propose truncated-weighting method in order to enhance the accuracy of estimated AOA. Through simulations, we confirm that the number of PDs in circular-PD-array affects the AOA estimation error performance of a light source. In addition, our proposed truncated-weighting scheme shows better AOA estimation performance than those of simple average and Max schemes. Based on AOA algorithms, we also investigate the performance indoor location estimation. As a consequence, we can final that our truncated scheme also shows better location awareness performance than other conventional ones.