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Performance evaluation of power allocation and diversity combining techniques for NOMA-MIMO-VLC systems with multi-user pairing algorithms.

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Názov: Performance evaluation of power allocation and diversity combining techniques for NOMA-MIMO-VLC systems with multi-user pairing algorithms.
Autori: Ibrahim, Hesham S.1,2 (AUTHOR) hesham.sadat@ensta.fr, Abaza, Mohamed3 (AUTHOR) mohamed.abaza@aast.edu, Mansour, Ali1 (AUTHOR) mansour@ieee.org, Alfalou, Ayman2 (AUTHOR) ayman.al-falou@isen-ouest.yncrea.fr
Zdroj: Optical & Quantum Electronics. Sep2025, Vol. 57 Issue 9, p1-27. 27p.
Predmety: *BIT error rate, *MIMO systems, *MONTE Carlo method, *OPTICAL communications, *TELECOMMUNICATION systems, *RESOURCE allocation
Abstrakt: This paper investigates the performance of a multiple-input multiple-output (MIMO)- non-orthogonal multiple access (NOMA)-based visible light communication (VLC) system. It explores various power allocation methods along with user-pairing algorithms aimed at enhancing system performance. A comparative evaluation is performed on fixed power allocation, gain ratio power allocation, and normalized gain difference power allocation, in conjunction with simple multi-user pairing techniques such as, the next-largest difference user-pairing algorithm and the uniform channel gain difference (UCGD) algorithm. Additionally, the study incorporates diversity combining techniques such as: selection combining, equal gain combining, and maximum ratio combining to exploit the benefits of receiver diversity. The performance of the system is assessed through the bit error rate (BER) for both even and odd user configurations in a 2 × 2 NOMA-MIMO-VLC setup utilizing on-off keying modulation. Monte-Carlo simulation results validate an analytical BER, considering both perfect and imperfect successive interference cancellation under the assumption of perfect channel state information. Furthermore, the results indicate that user pairing significantly enhances the BER performance in three-user scenarios compared to the scenario without pairing, while UCGD demonstrates the best BER performance in four-user scenarios. [ABSTRACT FROM AUTHOR]
Databáza: Academic Search Index
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Abstrakt:This paper investigates the performance of a multiple-input multiple-output (MIMO)- non-orthogonal multiple access (NOMA)-based visible light communication (VLC) system. It explores various power allocation methods along with user-pairing algorithms aimed at enhancing system performance. A comparative evaluation is performed on fixed power allocation, gain ratio power allocation, and normalized gain difference power allocation, in conjunction with simple multi-user pairing techniques such as, the next-largest difference user-pairing algorithm and the uniform channel gain difference (UCGD) algorithm. Additionally, the study incorporates diversity combining techniques such as: selection combining, equal gain combining, and maximum ratio combining to exploit the benefits of receiver diversity. The performance of the system is assessed through the bit error rate (BER) for both even and odd user configurations in a 2 × 2 NOMA-MIMO-VLC setup utilizing on-off keying modulation. Monte-Carlo simulation results validate an analytical BER, considering both perfect and imperfect successive interference cancellation under the assumption of perfect channel state information. Furthermore, the results indicate that user pairing significantly enhances the BER performance in three-user scenarios compared to the scenario without pairing, while UCGD demonstrates the best BER performance in four-user scenarios. [ABSTRACT FROM AUTHOR]
ISSN:03068919
DOI:10.1007/s11082-025-08395-7