THE EFFECT OF FOV ANGLE ON A RSSI-BASED VISIBLE LIGHT POSITIONING SYSTEM

Abstract

The effect of field of view (FOV) angle on the positioning performance in a visible light positioning (VLP) system utilizing light-emitting diodes (LEDs) is examined. Due to its simplicity and low cost, the received signal strength indication (RSSI) technique with trilateration is used for distance measurement. Since being robust to noise sources, the optical code division multiple access (CDMA) is preferred for broadcasting the unique identification and location information of each LED at the same time. LEDs are deployed on the ceiling of a highly reflective room with the aim of providing homogenous and suitable lighting. The varying angle of FOV - 30 degrees up to 88 degrees with 2-degree increments - is considered in the photodetector (PD) to obtain the effect of FOV on six different VLP scenarios with respect to the number of LEDs. All scenarios have the non-line of sight (NLOS) channel models up to three reflections. Simulation results show that increasing the number of transmitters (Txs) decreases the distance error sensitivity to the changes in the FOV angle. Consequently, indoor scenarios with increased Txs allow the use of low FOV angles. Acceptable distance errors are obtained even in harsh conditions, i.e., near the corner of the room.

Keywords

• Visible Light Positioning
• Field of View Angle
• Received Signal Strength Indication
• Non-Line of Sight Channel Model

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