RSS/AOA Positioning Scheme Using Multiple Receivers in Indoor VLC Communications

Abstract

Since GPS is not available in tunnels or indoor environments, the systems using LEDs are drawing attention as one of the various indoor positioning methods. Recently, an indoor positioning technique based on RSS(Received Signal Strength) has been proposed using a receiver consisting of multiple visible light sensors in a single LED environment. However, there is a problem that this technique cannot be operated in a real environment because the angle of incidence is assumed to be an accurate value. Therefore, in this paper we propose an indoor positioning technique that combines RSS and AOA (Angle of Arrival) in a receiver environment consisting of a single LED transmitter and a receiver consisting of four optical sensors. In the proposed technique, the angle of incidence is measured based on the image projected from each optical sensor of the receiver to estimate the distance between the LED and each sensor and determine the location of the receiver with the LSM (Least Square Method) algorithm. The validity of the proposed technique was proved through location estimation performance verification according to the change in the angle of incidence in the indoor simulation environment.