Real-Time 2.2-Gb/s Water-Air OFDM-OWC System With Low-Complexity Transmitter-Side DSP

Underwater optical wireless communication (UOWC) is of great interest to the academic and the industry community. In this article, we propose a low-complexity and effective joint transmitter-side digital signal processing (DSP) including geometric shaping, time-domain tone reservation (TR), and clip...

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Bibliographic Details
Published inJournal of lightwave technology Vol. 38; no. 20; pp. 5668 - 5675
Main Authors Shao, Yingjie, Deng, Rui, He, Jing, Wu, Kaiquan, Chen, Lian-Kuan
Format Journal Article
LanguageEnglish
Published New York IEEE 15.10.2020
The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subjects
Complexity
Complexity theory
Digital signal processing
OFDM
Optical transmitters
Orthogonal Frequency Division Multiplexing
PAPR
Peak to average power ratio
Real time
real-time FPGA
Real-time systems
Resource utilization
Stability analysis
Systems stability
Time domain analysis
Underwater communication
Underwater optical wireless communications
Video transmission
Wireless communication
Wireless communications
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Summary:Underwater optical wireless communication (UOWC) is of great interest to the academic and the industry community. In this article, we propose a low-complexity and effective joint transmitter-side digital signal processing (DSP) including geometric shaping, time-domain tone reservation (TR), and clipping. The peak-to-average power ratio reduction performance and implementation complexity of the proposed time-domain TR are extensively analyzed. We then develop a real-time 2.2-Gb/s system, which is optimized for its shaping ratio and clipping ratio. With the help of the efficient DSPs, an 8-dB received optical power enhancement is realized under the bit-error-rate threshold of 3.8 × 10 −3 . We successfully demonstrate a time-multiplexed four 4K video transmission in real-time using the proposed scheme over a 3.6-m underwater and 8-m free-space channel. The implementation details, as well as the analyses of system stability, resource utilization, and latency, are presented. The results validate the feasibility and effectiveness of the proposed scheme and a 2.2-Gbit/s real-time OWC system is demonstrated for a water-air communication link.
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ISSN:0733-8724
1558-2213
DOI:10.1109/JLT.2020.3001864