Abstract

In this paper, a non-line-of-sight multiple-input multiple-output space and time division multiple access optical camera communications system is proposed for an indoor environment. Mask matching and equal-gain combining (EGC) schemes as well as differential modulation and frame subtraction are used. We propose a unique packet structure to label the transmitters and a new detection method for data extraction from the captured video streams. We outline a comprehensive theoretical model and have developed an experimental testbed to evaluate the performance of the proposed system. The results highlight that zooming and defocusing of the camera does not have a significant impact on the system performance, therefore the aperture can be set to its maximum value. The system performs well over a link span of 10 m with a low transmit power of 12 mW and in the presence of ambient light due to the non-linear conversion of RAW to JPEG. Using mask matching and EGC improves the tolerance of the system to the noise.

© 2019 IEEE

Non-line-of-sight 2 × N indoor optical camera communications

Navid Bani Hassan, Zabih Ghassemlooy, Stanislav Zvanovec, Pengfei Luo, and Hoa Le-Minh
Appl. Opt. 57(7) B144-B149 (2018)

Interference cancellation in MIMO NLOS optical-camera-communication-based intelligent transport systems

Navid Bani Hassan, Zabih Ghassemlooy, Stanislav Zvanovec, Mauro Biagi, Anna Maria Vegni, Min Zhang, and Yingjia Huang
Appl. Opt. 58(34) 9384-9391 (2019)

Non-line-of-sight optical camera communication aided by a pilot

Shao-Qi Chen, Xue-Fen Chi, and Te-Yu Li
Opt. Lett. 46(14) 3348-3351 (2021)

Wavefront shaping for multi-user line-of-sight and non-line-of-sight visible light communication

Xiaomeng Zhou, Jianyang Shi, Nan Chi, Chao Shen, and Ziwei Li
Opt. Express 31(16) 25359-25371 (2023)

Simplified model for non-line-of-sight optical camera communication with a simple patterned reflective surface

Zhengye He, Jian Chen, and Changyuan Yu
Appl. Opt. 63(2) 506-514 (2024)