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<p>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 <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="11082_2025_8395_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="39" /> </InlineMediaObject> <EquationSource Format="TEX">\(2 \times 2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>2</mn> <mo>×</mo> <mn>2</mn> </mrow> </math></EquationSource> </InlineEquation> 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.</p>

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

  • 期刊论文

  • 发表日期：

    2025年8月20日

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  • Hesham S. Ibrahim,
  • Mohamed Abaza,
  • Ali Mansour,
  • Ayman Alfalou

摘要

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 \(2 \times 2\) 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.