Demonstration of Performance Improvement in Multi-User NOMA VLC System Using Joint Transceiver Optimization
The bit error ratio (BER) performance of a non-orthogonal multiple access (NOMA) visible light communication (VLC) system is poor due to the unequal distances between adjacent points in the superposition constellation (SC). In this paper, we propose a novel scheme to improve the BER performance by a...
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MDPI AG
2022-03-01
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| Series: | Photonics |
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| Online Access: | https://www.mdpi.com/2304-6732/9/3/168 |
| _version_ | 1797443501706706944 |
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| author | Tong Wu Zixiong Wang Shiying Han Jinlong Yu Yang Jiang |
| author_facet | Tong Wu Zixiong Wang Shiying Han Jinlong Yu Yang Jiang |
| author_sort | Tong Wu |
| collection | DOAJ |
| description | The bit error ratio (BER) performance of a non-orthogonal multiple access (NOMA) visible light communication (VLC) system is poor due to the unequal distances between adjacent points in the superposition constellation (SC). In this paper, we propose a novel scheme to improve the BER performance by adjusting parameters to change the shape of SC at the transmitter and by adjusting the parameters of successive interference cancellation (SIC) decoding at the receiver simultaneously, which is called a SC and SIC adjustment (SC-SIC-A) scheme. For multi-user NOMA VLC system, we derive the closed-form BER expression for each user, where the modulation format is four-quadrature amplitude modulation. According to the derived BER expressions, we formulate an optimization problem that minimizes the average BER for all users by adjusting the obtained parameters of SC and SIC decoding via differential evolution algorithm. The improvement of capacity performance is investigated consequently. In order to verify the feasibility and effectiveness of the proposed SC-SIC-A scheme, we carried out theoretical analysis, Monte Carlo simulation and experiments of two-user and three-user NOMA VLC systems. Results show that the SC-SIC-A scheme outperforms the existing schemes in NOMA VLC system, where the signal-to-noise ratio (SNR) reductions to achieve BER of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>3</mn></mrow></msup></semantics></math></inline-formula> are 1.3 dB and 0.8 dB for both users in the two-user NOMA VLC system, respectively, and the SNR reductions to achieve BER of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>3</mn></mrow></msup></semantics></math></inline-formula> are 5.7 dB, 4.3 dB and 4.6 dB for all users in the three-user NOMA VLC system, respectively. |
| first_indexed | 2024-03-09T12:57:00Z |
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| id | doaj.art-7e265173d9ee471087a520f1e8417537 |
| institution | Directory Open Access Journal |
| issn | 2304-6732 |
| language | English |
| last_indexed | 2024-03-09T12:57:00Z |
| publishDate | 2022-03-01 |
| publisher | MDPI AG |
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| series | Photonics |
| spelling | doaj.art-7e265173d9ee471087a520f1e84175372023-11-30T21:59:09ZengMDPI AGPhotonics2304-67322022-03-019316810.3390/photonics9030168Demonstration of Performance Improvement in Multi-User NOMA VLC System Using Joint Transceiver OptimizationTong Wu0Zixiong Wang1Shiying Han2Jinlong Yu3Yang Jiang4Tianjin International Engineering Institute, Tianjin University, Tianjin 300072, ChinaSchool of Electrical and Information Engineering, Tianjin University, Tianjin 300072, ChinaCollege of Electronic Information and Optical Engineering, Nankai University, Tianjin 300350, ChinaSchool of Electrical and Information Engineering, Tianjin University, Tianjin 300072, ChinaCollege of Physics, Guizhou University, Guiyang 550025, ChinaThe bit error ratio (BER) performance of a non-orthogonal multiple access (NOMA) visible light communication (VLC) system is poor due to the unequal distances between adjacent points in the superposition constellation (SC). In this paper, we propose a novel scheme to improve the BER performance by adjusting parameters to change the shape of SC at the transmitter and by adjusting the parameters of successive interference cancellation (SIC) decoding at the receiver simultaneously, which is called a SC and SIC adjustment (SC-SIC-A) scheme. For multi-user NOMA VLC system, we derive the closed-form BER expression for each user, where the modulation format is four-quadrature amplitude modulation. According to the derived BER expressions, we formulate an optimization problem that minimizes the average BER for all users by adjusting the obtained parameters of SC and SIC decoding via differential evolution algorithm. The improvement of capacity performance is investigated consequently. In order to verify the feasibility and effectiveness of the proposed SC-SIC-A scheme, we carried out theoretical analysis, Monte Carlo simulation and experiments of two-user and three-user NOMA VLC systems. Results show that the SC-SIC-A scheme outperforms the existing schemes in NOMA VLC system, where the signal-to-noise ratio (SNR) reductions to achieve BER of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>3</mn></mrow></msup></semantics></math></inline-formula> are 1.3 dB and 0.8 dB for both users in the two-user NOMA VLC system, respectively, and the SNR reductions to achieve BER of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>3</mn></mrow></msup></semantics></math></inline-formula> are 5.7 dB, 4.3 dB and 4.6 dB for all users in the three-user NOMA VLC system, respectively.https://www.mdpi.com/2304-6732/9/3/168non-orthogonal multiple access (NOMA)visible light communication (VLC)superposition constellation adjustmentsuccessive interference cancellationbit error ratioNOMA triangle |
| spellingShingle | Tong Wu Zixiong Wang Shiying Han Jinlong Yu Yang Jiang Demonstration of Performance Improvement in Multi-User NOMA VLC System Using Joint Transceiver Optimization Photonics non-orthogonal multiple access (NOMA) visible light communication (VLC) superposition constellation adjustment successive interference cancellation bit error ratio NOMA triangle |
| title | Demonstration of Performance Improvement in Multi-User NOMA VLC System Using Joint Transceiver Optimization |
| title_full | Demonstration of Performance Improvement in Multi-User NOMA VLC System Using Joint Transceiver Optimization |
| title_fullStr | Demonstration of Performance Improvement in Multi-User NOMA VLC System Using Joint Transceiver Optimization |
| title_full_unstemmed | Demonstration of Performance Improvement in Multi-User NOMA VLC System Using Joint Transceiver Optimization |
| title_short | Demonstration of Performance Improvement in Multi-User NOMA VLC System Using Joint Transceiver Optimization |
| title_sort | demonstration of performance improvement in multi user noma vlc system using joint transceiver optimization |
| topic | non-orthogonal multiple access (NOMA) visible light communication (VLC) superposition constellation adjustment successive interference cancellation bit error ratio NOMA triangle |
| url | https://www.mdpi.com/2304-6732/9/3/168 |
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