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Cooperative Terrestrial-Underwater Wireless Optical Links by Using an Amplify-and-Forward Strategy.

Antonio Jurado-Navas1, Carmen Álvarez-Roa1, María Álvarez-Roa1

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This study analyzes a combined terrestrial-underwater optical communication link for high-speed connectivity. Researchers used dual-hop amplify-and-forward systems and advanced simulations to achieve accurate bit error rate results.

Keywords:
Málaga turbulenceWeibullamplify-and-forwardcombined terrestrial-underwater optical communication

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Area of Science:

  • Optical Communications
  • Wireless Networks
  • Signal Processing

Background:

  • Terrestrial-underwater optical links are crucial for high-speed data transmission between onshore and submerged systems.
  • Free-space optical (FSO) systems face challenges from atmospheric and underwater turbulence.
  • Previous research has explored individual link performance, but combined system analysis is less common.

Purpose of the Study:

  • To analyze the performance of a combined terrestrial-underwater optical communication link.
  • To evaluate different transmission signaling schemes for optimizing average bit error rate (ABER).
  • To develop accurate performance models for dual-hop FSO systems under realistic channel conditions.

Main Methods:

  • Utilized a dual-hop amplify-and-forward (AF) system model.
  • Modeled the terrestrial link with Málaga distributed turbulence.
  • Modeled the underwater link with a Weibull channel model.
  • Employed a semi-analytical simulation procedure with hyper-exponential fitting for BER analysis.

Main Results:

  • Achieved closed-form expressions for bit error rate (BER).
  • Obtained high-accuracy numerical results for the combined system's performance.
  • Demonstrated the system's behavior based on known conditional bit-error-rate (CBER) in clear conditions.

Conclusions:

  • The proposed semi-analytical method provides accurate performance evaluation for combined terrestrial-underwater optical links.
  • The study offers valuable insights into optimizing signaling schemes for robust high-speed optical connectivity in hybrid environments.
  • This research contributes to the advancement of reliable underwater and terrestrial optical communication systems.