The Spatial Dimming Scheme for the MU-MIMO-OFDM VLC System
Multiuser visible light communication (MU-VLC) systems utilizing multiple-input multiple-output (MIMO) and orthogonal frequency-division multiplexing (OFDM) are gaining increased attentions recently. Visible light communication (VLC) links are expected to work under different illumination conditions...
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IEEE
2018-01-01
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| Series: | IEEE Photonics Journal |
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| Online Access: | https://ieeexplore.ieee.org/document/8444052/ |
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| author | Zhen Feng Caili Guo Zabih Ghassemlooy Yang Yang |
| author_facet | Zhen Feng Caili Guo Zabih Ghassemlooy Yang Yang |
| author_sort | Zhen Feng |
| collection | DOAJ |
| description | Multiuser visible light communication (MU-VLC) systems utilizing multiple-input multiple-output (MIMO) and orthogonal frequency-division multiplexing (OFDM) are gaining increased attentions recently. Visible light communication (VLC) links are expected to work under different illumination conditions and, thus, the need for dimming control mechanisms. However, the traditional analog- and digital-based dimming schemes have adverse effects on the data communications performance, such as clipping distortion and the variation of the duty cycle. In this paper, spatial dimming schemes based on the zero-forcing and the minimum mean-squared error precoding schemes are proposed for direct-current biased optical OFDM based indoor MU-MIMO VLC system, and the bipolar optical OFDM signal is biased by a fixed dc level. Transmit antenna selection algorithms are designed for the optimum working light emitting diodes (LEDs) subset at each dimming level. Owing to the simultaneously exploration of the selection diversity of LEDs-based lights and the channel state information, the proposed spatial dimming schemes outperform the traditional dimming schemes, which is also verified by simulation results. Thus, the proposed schemes are shown to have a great potential to be applied in practical MU-MIMO-OFDM VLC systems. |
| format | Article |
| id | doaj-art-a94b72a2c4e846b0bdc41ee5b3f4ddea |
| institution | Kabale University |
| issn | 1943-0655 |
| language | English |
| publishDate | 2018-01-01 |
| publisher | IEEE |
| record_format | Article |
| series | IEEE Photonics Journal |
| spelling | doaj-art-a94b72a2c4e846b0bdc41ee5b3f4ddea2025-08-20T03:31:16ZengIEEEIEEE Photonics Journal1943-06552018-01-0110511310.1109/JPHOT.2018.28667068444052The Spatial Dimming Scheme for the MU-MIMO-OFDM VLC SystemZhen Feng0https://orcid.org/0000-0001-5791-1946Caili Guo1https://orcid.org/0000-0001-8892-4520Zabih Ghassemlooy2https://orcid.org/0000-0002-5780-9703Yang Yang3https://orcid.org/0000-0002-1353-0890Beijing Laboratory of Advanced Information Networks, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, ChinaBeijing Key Laboratory of Network System Architecture and Convergence, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, ChinaOptical Communications Research Group, NCRLab, Faculty of Engineering and Environment, Northumbria University, Newcastle-upon-Tyne, U.K.Beijing Laboratory of Advanced Information Networks, School of Information and Communication Engineering, Beijing University of Posts and Telecommunications, Beijing, ChinaMultiuser visible light communication (MU-VLC) systems utilizing multiple-input multiple-output (MIMO) and orthogonal frequency-division multiplexing (OFDM) are gaining increased attentions recently. Visible light communication (VLC) links are expected to work under different illumination conditions and, thus, the need for dimming control mechanisms. However, the traditional analog- and digital-based dimming schemes have adverse effects on the data communications performance, such as clipping distortion and the variation of the duty cycle. In this paper, spatial dimming schemes based on the zero-forcing and the minimum mean-squared error precoding schemes are proposed for direct-current biased optical OFDM based indoor MU-MIMO VLC system, and the bipolar optical OFDM signal is biased by a fixed dc level. Transmit antenna selection algorithms are designed for the optimum working light emitting diodes (LEDs) subset at each dimming level. Owing to the simultaneously exploration of the selection diversity of LEDs-based lights and the channel state information, the proposed spatial dimming schemes outperform the traditional dimming schemes, which is also verified by simulation results. Thus, the proposed schemes are shown to have a great potential to be applied in practical MU-MIMO-OFDM VLC systems.https://ieeexplore.ieee.org/document/8444052/Visible light communication (VLC)dimming controlmultiple-input multiple-output (MIMO)orthogonal frequency-division multiplexing (OFDM)multiuser. |
| spellingShingle | Zhen Feng Caili Guo Zabih Ghassemlooy Yang Yang The Spatial Dimming Scheme for the MU-MIMO-OFDM VLC System IEEE Photonics Journal Visible light communication (VLC) dimming control multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) multiuser. |
| title | The Spatial Dimming Scheme for the MU-MIMO-OFDM VLC System |
| title_full | The Spatial Dimming Scheme for the MU-MIMO-OFDM VLC System |
| title_fullStr | The Spatial Dimming Scheme for the MU-MIMO-OFDM VLC System |
| title_full_unstemmed | The Spatial Dimming Scheme for the MU-MIMO-OFDM VLC System |
| title_short | The Spatial Dimming Scheme for the MU-MIMO-OFDM VLC System |
| title_sort | spatial dimming scheme for the mu mimo ofdm vlc system |
| topic | Visible light communication (VLC) dimming control multiple-input multiple-output (MIMO) orthogonal frequency-division multiplexing (OFDM) multiuser. |
| url | https://ieeexplore.ieee.org/document/8444052/ |
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