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NOMA cooperative VLC systems: design and performance analysis with OOK and L-PPM modulation.
Applied Optics
|September 14, 2023
Summary
This study introduces nonorthogonal multiple access (NOMA) cooperative techniques for visible light communication (VLC) systems. The proposed methods enhance spatial diversity and system capacity, validated by bit error probability calculations.
Area of Science:
- Optical Communications
- Wireless Networking
- Signal Processing
Background:
- Visible Light Communication (VLC) leverages white LEDs for simultaneous lighting and data transmission, improving resource efficiency.
- Cooperative communication strategies, including relaying, can significantly enhance spatial diversity, coverage, and capacity in wireless systems.
- Nonorthogonal Multiple Access (NOMA) is an advanced multiplexing technique enabling multiple users to share the same resource, improving spectral efficiency.
Purpose of the Study:
- To propose and analyze novel nonorthogonal multiple access (NOMA) cooperative techniques for Visible Light Communication (VLC) systems.
- To evaluate the performance of these techniques using On-Off Keying (OOK) and L-Pulse-Position Modulation (L-PPM).
- To investigate the impact of successive interference cancellation (SIC) under both perfect and imperfect conditions on system performance.
Main Methods:
- Development of NOMA cooperative VLC system models utilizing OOK and L-PPM modulation.
- Implementation of Maximum Ratio Combining (MRC) at the receiver for signal aggregation.
- Adoption of the decode-and-forward relaying protocol for cooperative transmissions.
- Analytical calculation of Bit Error Probability (BEP) for multi-user, two-user, and three-user scenarios.
Main Results:
- The study provides analytical expressions for the Bit Error Probability (BEP) of the proposed NOMA cooperative VLC system.
- Performance evaluation under both perfect and imperfect successive interference cancellation (SIC) scenarios is presented.
- Simulation results are generated to corroborate the derived analytical BEP outcomes.
Conclusions:
- The proposed NOMA cooperative techniques offer a viable approach to enhance performance in VLC systems.
- The analytical framework developed allows for accurate prediction of system behavior under various conditions.
- The findings validate the effectiveness of cooperative NOMA strategies in improving spatial diversity and capacity in VLC networks.
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