Two-dimensional power allocation scheme for NOMA-based underwater visible light communication systems.

Area of Science:

• Optical Communications
• Wireless Networks
• Signal Processing

Background:

• Underwater visible light communication (UVLC) faces challenges in performance and user management.
• Non-orthogonal multiple access (NOMA) offers potential for enhanced spectral efficiency in UVLC systems.
• Efficient power allocation is crucial for optimizing NOMA-based UVLC system performance.

Purpose of the Study:

• To propose a novel two-dimensional power allocation scheme for NOMA-based UVLC systems.
• To investigate the impact of fractional transmit power allocation (FTPA) and the sine cosine algorithm (SCA) on system performance.
• To enhance the transmission rate and mitigate user pairing effects in deep-sea UVLC environments.

Main Methods:

• Development of a two-dimensional power allocation scheme combining FTPA and SCA.
• Simulation of a downlink NOMA-based UVLC system utilizing blue-light-emitting diodes.
• Evaluation of system performance under varying FTPA coefficients and SCA parameters.

Main Results:

• The proposed two-dimensional power allocation scheme effectively reduces the impact of user pairing.
• Significant improvements in system transmission rates were observed compared to conventional methods.
• The FTPA coefficient and SCA parameters demonstrate a notable influence on overall system performance.

Conclusions:

• The combined FTPA and SCA power allocation scheme offers a robust solution for NOMA-based UVLC systems.
• This approach enhances communication performance in challenging deep-sea environments.
• The study highlights the effectiveness of intelligent algorithms in optimizing future UVLC networks.