On the realization of across wavy water-air-interface diffuse-line-of-sight communication based on an ultraviolet emitter
KAUST DepartmentComputer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division
Electrical Engineering Program
KAUST Grant NumberBAS/1/1614-01-01||KCR/1/2081-01-01||GEN/1/6607-01-01
Online Publication Date2019-06-27
Print Publication Date2019-07-08
Permanent link to this recordhttp://hdl.handle.net/10754/655997
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AbstractWe experimentally demonstrated high-speed diffuse line-of-sight optical wireless communication across a wavy water-air-interface. The testbed channel was evaluated, in terms of data rate, coverage and robustness to the dynamic wave movement, based on the performance of different modulation schemes, including non-return-to-zero on-off keying (NRZ-OOK) and quadrature amplitude modulation (QAM)-orthogonal frequency division multiplexing (OFDM). Under the emulated calm water condition, 8-QAM-OFDM offers a data rate of 111.4 Mbit/s at the aligned position, while only 55 Mbit/s is achieved using NRZ-OOK. On the other hand, effective communication can still be maintained at a high data rate of 11 Mbit/s when the photodetector is off aligned laterally by 5 cm based on NRZ-OOK modulation, leading to a coverage of ~79 cm2. By utilizing OFDM modulation scheme, a data rate of 30 Mbit/s can be achieved up to 2.5-cm misalignment, leading to a coverage of ~20 cm2. Furthermore, in the presence of strong waves (15-mm wave height, causing a scintillation index of 0.667), 4-QAM-OFDM modulation showed a better resilience to channel instability than NRZ-OOK modulation. Our studies pave the way for the eventual realization of communication across a challenging water-air interface without the need for an interface relay, which is much sought-after for implementing a robust and large-coverage underwater-to-terrestrial internet-of-things.
CitationSun, X., Kong, M., Shen, C., Kang, C. H., Ng, T. K., & Ooi, B. S. (2019). On the realization of across wavy water-air-interface diffuse-line-of-sight communication based on an ultraviolet emitter. Optics Express, 27(14), 19635. doi:10.1364/oe.27.019635
SponsorsKing Abdulaziz City for Science and Technology (KACST) Grant KACST TIC R2-FP-008; King Abdullah University of Science and Technology (KAUST) BAS/1/1614-01-01, KCR/1/2081-01-01 and GEN/1/6607-01-01.
PublisherThe Optical Society