Decoding-Order-Based Power Allocation (DOPA) Scheme for Non-Orthogonal Multiple Access (NOMA) Visible Light Communication Systems
Non-orthogonal multiple access (NOMA) is an effective multiple access scheme that can be used to improve considerably the spectral efficiency of indoor downlink visible light communication (VLC) systems. However, NOMA suffers from inevitable multi-user interference which degrades the system performa...
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MDPI AG
2022-10-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/9/10/718 |
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| author | Ali H. Alqahtani Esam M. Almohimmah Mohammed T. Alresheedi Ahmad Fauzi Abas Ahmad-Adnan Qidan Jaafar Elmirghani |
| author_facet | Ali H. Alqahtani Esam M. Almohimmah Mohammed T. Alresheedi Ahmad Fauzi Abas Ahmad-Adnan Qidan Jaafar Elmirghani |
| author_sort | Ali H. Alqahtani |
| collection | DOAJ |
| description | Non-orthogonal multiple access (NOMA) is an effective multiple access scheme that can be used to improve considerably the spectral efficiency of indoor downlink visible light communication (VLC) systems. However, NOMA suffers from inevitable multi-user interference which degrades the system performance. In this paper, a NOMA scheme is applied in a downlink VLC system and the impact of the multi-user interference on the system performance is studied. A closed-form expression for the user symbol error rate (SER) is derived and a decoding-order-based power allocation (DOPA) method is proposed to reduce the multi-user interference and find the optimal power allocation that minimizes the SER. The significance of the proposed schemes is demonstrated by simulation. The results show that the proposed DOPA method is able to reduce effectively the multi-user interference and provide more sum rate in comparison with benchmarking schemes such as the gain ratio PA (GRPA) and the normalized gain difference PA (NGDPA) methods. |
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| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-09T19:33:34Z |
| publishDate | 2022-10-01 |
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| series | Photonics |
| spelling | doaj.art-55b469cdc19e4ffa98538131072ade9e2023-11-24T02:01:30ZengMDPI AGPhotonics2304-67322022-10-0191071810.3390/photonics9100718Decoding-Order-Based Power Allocation (DOPA) Scheme for Non-Orthogonal Multiple Access (NOMA) Visible Light Communication SystemsAli H. Alqahtani0Esam M. Almohimmah1Mohammed T. Alresheedi2Ahmad Fauzi Abas3Ahmad-Adnan Qidan4Jaafar Elmirghani5College of Applied Engineering, King Saud University, Riyadh 11451, Saudi ArabiaDepartment of Electrical Engineering, King Saud University, Riyadh 11421, Saudi ArabiaDepartment of Electrical Engineering, King Saud University, Riyadh 11421, Saudi ArabiaDepartment of Electrical Engineering, King Saud University, Riyadh 11421, Saudi ArabiaSchool of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UKSchool of Electronic and Electrical Engineering, University of Leeds, Leeds LS2 9JT, UKNon-orthogonal multiple access (NOMA) is an effective multiple access scheme that can be used to improve considerably the spectral efficiency of indoor downlink visible light communication (VLC) systems. However, NOMA suffers from inevitable multi-user interference which degrades the system performance. In this paper, a NOMA scheme is applied in a downlink VLC system and the impact of the multi-user interference on the system performance is studied. A closed-form expression for the user symbol error rate (SER) is derived and a decoding-order-based power allocation (DOPA) method is proposed to reduce the multi-user interference and find the optimal power allocation that minimizes the SER. The significance of the proposed schemes is demonstrated by simulation. The results show that the proposed DOPA method is able to reduce effectively the multi-user interference and provide more sum rate in comparison with benchmarking schemes such as the gain ratio PA (GRPA) and the normalized gain difference PA (NGDPA) methods.https://www.mdpi.com/2304-6732/9/10/718non-orthogonal multiple access (NOMA)visible light communication (VLC)successive interference cancellation (SIC)interference management |
| spellingShingle | Ali H. Alqahtani Esam M. Almohimmah Mohammed T. Alresheedi Ahmad Fauzi Abas Ahmad-Adnan Qidan Jaafar Elmirghani Decoding-Order-Based Power Allocation (DOPA) Scheme for Non-Orthogonal Multiple Access (NOMA) Visible Light Communication Systems Photonics non-orthogonal multiple access (NOMA) visible light communication (VLC) successive interference cancellation (SIC) interference management |
| title | Decoding-Order-Based Power Allocation (DOPA) Scheme for Non-Orthogonal Multiple Access (NOMA) Visible Light Communication Systems |
| title_full | Decoding-Order-Based Power Allocation (DOPA) Scheme for Non-Orthogonal Multiple Access (NOMA) Visible Light Communication Systems |
| title_fullStr | Decoding-Order-Based Power Allocation (DOPA) Scheme for Non-Orthogonal Multiple Access (NOMA) Visible Light Communication Systems |
| title_full_unstemmed | Decoding-Order-Based Power Allocation (DOPA) Scheme for Non-Orthogonal Multiple Access (NOMA) Visible Light Communication Systems |
| title_short | Decoding-Order-Based Power Allocation (DOPA) Scheme for Non-Orthogonal Multiple Access (NOMA) Visible Light Communication Systems |
| title_sort | decoding order based power allocation dopa scheme for non orthogonal multiple access noma visible light communication systems |
| topic | non-orthogonal multiple access (NOMA) visible light communication (VLC) successive interference cancellation (SIC) interference management |
| url | https://www.mdpi.com/2304-6732/9/10/718 |
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