Efficient capacity enhancement using OFDM with interleaved subcarrier number modulation in bandlimited UOWC systems

Jiamin Chen, Bohua Deng, Chen Chen, Min Liu, H. Y. Fu, Harald Haas

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Abstract

We propose and demonstrate an efficient capacity enhancement scheme for bandlimited underwater optical wireless communication (UOWC) systems by utilizing orthogonal frequency division multiplexing with interleaved subcarrier number modulation (OFDM-ISNM). In the proposed OFDM-ISNM, joint number and constellation mapping/de-mapping is utilized to avoid error propagation and subblock interleaving is further applied to address the low-pass effect of the bandlimited UOWC system. The feasibility and superiority of the proposed OFDM-ISNM scheme for practical bandlimited UOWC systems have been verified through both simulations and experiments. The obtained results demonstrate that the proposed OFDM-ISNM scheme is capable of efficiently improving the achievable data rate of the bandlimited UOWC system. Specifically, the experimental results show a significant 28.6% capacity enhancement by OFDM-ISNM over other benchmark schemes, achieving a data rate of 3.6 Gbps through a 2-m water channel.
Original languageEnglish
Pages (from-to)30723-30734
Number of pages12
JournalOptics Express
Volume31
Issue number19
Early online date1 Sept 2023
DOIs
Publication statusPublished - 11 Sept 2023

Keywords

  • underwater optical wireless communication (UOWC)
  • OFDM-ISNM
  • bandlimited systems

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