Cubic-Receiver-Based Indoor Optical Wireless Location System

A cubic-receiver-based indoor optical wireless location system is proposed in this paper. The cubic receiver arranging five photodiodes (PDs) as a cubic structure is used as photodetector to measure the angles of arrival (AOAs) of the incident light from multiple light-emitting diodes. Due to the cubic structure, the AOA has a simple relationship with the differential received photocurrents; hence, the AOA can be conveniently obtained by measuring the differential received photocurrents of five PDs. This system is shown to have several advantages, such as wide field of view (FOV), low algorithm complexity, and high accuracy. The system performance is numerically simulated, and the experiment shows that a mean positioning error of 3.3 cm can be achieved.