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Open AccessArticle

Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication

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Electrical Engineering Department, Faculty of Engineering, King Khalid University, Abha 61411, Saudi Arabia
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Electrical Engineering Department, Faculty of Engineering, Aswan University, Aswan 81528, Egypt
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Electrical Engineering Department, Assiut University, Assiut 71515, Egypt
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Author to whom correspondence should be addressed.
Electronics 2020, 9(1), 168; https://doi.org/10.3390/electronics9010168
Received: 28 October 2019 / Revised: 7 January 2020 / Accepted: 13 January 2020 / Published: 16 January 2020
(This article belongs to the Special Issue Visible Light (VLC) and Camera 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. 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 ( OFDM t d ) 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 (R) compared with existing up-to-date OFDM-LED index modulations with even lower computational complexity. View Full-Text
Keywords: optical MIMO-OFDM; visible light communication (VLC); OFDM-LED index modulation; generalized led index modulation optical MIMO-OFDM; visible light communication (VLC); OFDM-LED index modulation; generalized led index modulation
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MDPI and ACS Style

S. Hussein, H.; Hagag, M.; Farrag, M. Extended Spatial-Index LED Modulation for Optical MIMO-OFDM Wireless Communication. Electronics 2020, 9, 168.

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