Study of NLOS effect on Indoor Visible Light Positioning in Different Room Sizes

In indoor visible light positioning systems, indoor reflections in different room size will cause different impact on positioning accuracy. In this work, we investigate the RSS-based positioning errors with different room size. Results show that when the room size increases, positioning accuracy is becoming higher. When room size reaches 15m*15m*3m, the maximum positioning error due to non-line-of-sight (NLOS) is only 1 mm worse than that for line-of-sight (LOS) case. Thus, if room size exceeds this value, we can ignore NLOS effect. We also considered the effect of LED half power angle and receiver field-of-view changes on maximum positioning error. Results show that the former has greater impact on positioning.