A Novel Experimental Visible Light Positioning System with Low Bandwidth Requirement and High Precision Pulse Reconstruction

• Published in: 2023 13th International Conference on Indoor Positioning and Indoor Navigation (IPIN) pp. 1 - 6
• Main Authors: Huang, Xuan, Pan, Xueming, Wan, Zhixin, Xu, Mengzheng, Wang, Zhenghai, Liu, Xiaodong, Wang, Yuhao, Zhang, Xun
• Format: Conference Proceeding
• Language: English
• Published: IEEE 25.09.2023
• Subjects: Bandwidth; beacon design; Costs; Light emitting diodes; Photodetectors; Receivers; Reconstruction algorithms; sampling rate; Transmitters; Visible light positioning
• ISSN: 2471-917X
• DOI: 10.1109/IPIN57070.2023.10332488

Visible light positioning (VLP) has advantages over traditional indoor positioning techniques in terms of high positioning accuracy and low cost. However, in resource-constrained VLP systems, especially devices deployed on Internet-of-Things networks, both the bandwidth of the light-emitting diode (LED)-based transmitter and the sampling rate of the photodetector (PD)-based receiver are limited. In turn, this significantly limits the positioning accuracy. To address this issue and accommodate the scenario of low bandwidth and hardware cost, a novel positioning scheme with low bandwidth requirements and high-precision pulse reconstruction is proposed in the paper. Specifically, a new beacon signal is designed based on the on-off keying pulse pairs to remove the synchronization requirement and save bandwidth costs. Then, based on the maximum a posteriori probability criterion, a low sampling rate positioning scheme is exploited to estimate the location from the pulse pairs received by the PD. Moreover, an experimental test-bed is constructed to verify the effectiveness and feasibility of the proposed positioning scheme. Experimental results demonstrate that the proposed scheme achieves a positioning accuracy of 1.7 cm by using the reconstructed 2 GHz sampling rate in the case of a bandwidth of 50 MHz and a real sampling rate of 100 MHz. The positioning accuracy achieved by the proposed scheme remains within 30 cm, even under the few MHz of inherent LED bandwidth.