Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication
An efficient optical modulation technique for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) visible light communication system is proposed in this paper. The proposed modulation technique is termed as extended spatial-index light-emitting diode (LED) modulation. I...
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doaj-66a36336bf23409fba7f4aa575456aaa2020-11-25T01:38:06ZengMDPI AGElectronics2079-92922020-01-019116810.3390/electronics9010168electronics9010168Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless CommunicationHany S. Hussein0Mohamed Hagag1Mohammed Farrag2Electrical Engineering Department, Faculty of Engineering, King Khalid University, Abha 61411, Saudi ArabiaElectrical Engineering Department, Faculty of Engineering, Aswan University, Aswan 81528, EgyptElectrical Engineering Department, Faculty of Engineering, King Khalid University, Abha 61411, Saudi ArabiaAn efficient optical modulation technique for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) visible light communication system is proposed in this paper. The proposed modulation technique is termed as extended spatial-index light-emitting diode (LED) modulation. In the proposed technique, the indices (the spatial domain) of the LEDs are exploited in a dynamic style to not only get rid of the optical OFDM time-domain (<inline-formula> <math display="inline"> <semantics> <msub> <mi>OFDM</mi> <mrow> <mi>t</mi> <mi>d</mi> </mrow> </msub> </semantics> </math> </inline-formula>) shaping problem but also to expand the LED indices spatial modulation domain. The indices of the active LEDs in the proposed technique are changed from the two LEDs active situation to the situation where all or several LEDs are active. Moreover, within the selected active LED indices, the power weight distribution and the positions of the OFDM components are varied to expand the resultant spatial domain. Therefore, the proposed technique offers a considerable spectral efficiency improvement over the up-to-date LED index OFDM modulation schemes even with a lower number of LEDs. The key idea of the proposed technique is to maximize the LEDs’ indices spatial position (spatial domain) utilization, where both the power weight allocation and the positions of the complex OFDM time domain components are varying several times over the same active LED indices combination, which improve the optical system spectral efficiency. The simulation results asserted the superiority of the proposed technique, as it improves both the average bit error rate (ABER) and the achievable data rate (<i>R</i>) compared with existing up-to-date OFDM-LED index modulations with even lower computational complexity.https://www.mdpi.com/2079-9292/9/1/168optical mimo-ofdmvisible light communication (vlc)ofdm-led index modulationgeneralized led index modulation |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Hany S. Hussein Mohamed Hagag Mohammed Farrag |
spellingShingle |
Hany S. Hussein Mohamed Hagag Mohammed Farrag Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication Electronics optical mimo-ofdm visible light communication (vlc) ofdm-led index modulation generalized led index modulation |
author_facet |
Hany S. Hussein Mohamed Hagag Mohammed Farrag |
author_sort |
Hany S. Hussein |
title |
Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication |
title_short |
Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication |
title_full |
Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication |
title_fullStr |
Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication |
title_full_unstemmed |
Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication |
title_sort |
extended spatial-index led modulation for optical mimo-ofdm wireless communication |
publisher |
MDPI AG |
series |
Electronics |
issn |
2079-9292 |
publishDate |
2020-01-01 |
description |
An efficient optical modulation technique for multi-input multi-output (MIMO) orthogonal frequency division multiplexing (OFDM) visible light communication system is proposed in this paper. The proposed modulation technique is termed as extended spatial-index light-emitting diode (LED) modulation. In the proposed technique, the indices (the spatial domain) of the LEDs are exploited in a dynamic style to not only get rid of the optical OFDM time-domain (<inline-formula> <math display="inline"> <semantics> <msub> <mi>OFDM</mi> <mrow> <mi>t</mi> <mi>d</mi> </mrow> </msub> </semantics> </math> </inline-formula>) shaping problem but also to expand the LED indices spatial modulation domain. The indices of the active LEDs in the proposed technique are changed from the two LEDs active situation to the situation where all or several LEDs are active. Moreover, within the selected active LED indices, the power weight distribution and the positions of the OFDM components are varied to expand the resultant spatial domain. Therefore, the proposed technique offers a considerable spectral efficiency improvement over the up-to-date LED index OFDM modulation schemes even with a lower number of LEDs. The key idea of the proposed technique is to maximize the LEDs’ indices spatial position (spatial domain) utilization, where both the power weight allocation and the positions of the complex OFDM time domain components are varying several times over the same active LED indices combination, which improve the optical system spectral efficiency. The simulation results asserted the superiority of the proposed technique, as it improves both the average bit error rate (ABER) and the achievable data rate (<i>R</i>) compared with existing up-to-date OFDM-LED index modulations with even lower computational complexity. |
topic |
optical mimo-ofdm visible light communication (vlc) ofdm-led index modulation generalized led index modulation |
url |
https://www.mdpi.com/2079-9292/9/1/168 |
work_keys_str_mv |
AT hanyshussein extendedspatialindexledmodulationforopticalmimoofdmwirelesscommunication AT mohamedhagag extendedspatialindexledmodulationforopticalmimoofdmwirelesscommunication AT mohammedfarrag extendedspatialindexledmodulationforopticalmimoofdmwirelesscommunication |
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