Non-line-of-sight WDM-MIMO optical camera communications with the DBPWR algorithm

Ningcong Jiang, Bangjiang Lin*, Qiwei Lai, Tianming Huang, Zabih Ghassemlooy, Othman Isam Younus, Jiabin Luo, Yufang Xie, Lingfeng Dai, Zhuo Huang

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


Non-line-of-sight (NLOS) optical camera communications (OCC) is a potential wireless communication technology, which offers robustness to blocking and blooming effect, higher data throughput over longer transmission distances compared with line-of-sight OCC. In this work, we propose a wavelength division multiplexing (WDM)-multiple inputs multiple outputs (MIMO) NLOS OCC system with multi-level pulse width modulation (MPWM) and difference-based pulse width recognition (DBPWR) schemes. Signals on different color channels are separated through the RGB filter of the CMOS camera, while MPWM signals on the same color channel are separated using the DBPWR algorithm. Compared with the conventional threshold-based demodulation scheme, the proposed DBPWR scheme has lower complexity, higher reliability, and improved sampling frequency offset tolerance. A total data rate of 10.8 kb/s is experimentally demonstrated over more than 2 m NLOS link using the proposed WDM-MIMO OCC system, which is sufficient in many Internet of things applications.

Original languageEnglish
Article number128371
JournalOptics Communications
Early online date27 Apr 2022
Publication statusPublished - 1 Sept 2022


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