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Spectral-efficient reconstructed LACO-OFDM transmission for dimming compatible visible light communications

Spectral-efficient reconstructed LACO-OFDM transmission for dimming compatible visible light communications
Spectral-efficient reconstructed LACO-OFDM transmission for dimming compatible visible light communications

Dimming control is critical in practical visible light communication (VLC) systems to satisfy illumination demand. Upon exploiting multiple layers of asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) signals for simultaneous transmission, layered ACO-OFDM (LACO-OFDM) constitutes a promising spectral-efficient modulation technique for VLC. However, dimming by integrating the industry-preferred pulsewidth modulation (PWM) to the LACO-OFDM scheme induces severe clipping noise due to the nonlinearity of LEDs. In this paper, we conceive a reconstructed LACO-OFDM (RLACO-OFDM) scheme incorporating the PWM technique for VLC to accommodate the dimming demands for indoor illumination, while maintaining a spectral-efficient communication link. Moreover, superior to its counterparts, the transmitted symbols in the RLACO-OFDM based VLC system can be readily recovered by a standard LACO-OFDM receiver while no additional detection of the PWM signal is required, which reduces the receiver complexity. Numerical results demonstrate that the proposed RLACO-OFDM is capable of realizing high spectral efficiency over a broad dimming range.

asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM), dimming control, layered ACO-OFDM, pulse width modulation (PWM), Visible light communication (VLC)
1943-0655
Li, Baolong
63383588-91d3-448e-a94e-2779484f5a7f
Xu, Wei
cef87ede-4edd-4bde-a9f8-a4c63e18c418
Feng, Simeng
038a3c0d-9d57-4031-8d38-2203ea230e79
Li, Zhengquan
7a0fc2f0-10f0-42ee-9430-3a8cddd70d84
Li, Baolong
63383588-91d3-448e-a94e-2779484f5a7f
Xu, Wei
cef87ede-4edd-4bde-a9f8-a4c63e18c418
Feng, Simeng
038a3c0d-9d57-4031-8d38-2203ea230e79
Li, Zhengquan
7a0fc2f0-10f0-42ee-9430-3a8cddd70d84

Li, Baolong, Xu, Wei, Feng, Simeng and Li, Zhengquan (2019) Spectral-efficient reconstructed LACO-OFDM transmission for dimming compatible visible light communications. IEEE Photonics Journal, 11 (1). (doi:10.1109/JPHOT.2019.2892849).

Record type: Article

Abstract

Dimming control is critical in practical visible light communication (VLC) systems to satisfy illumination demand. Upon exploiting multiple layers of asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM) signals for simultaneous transmission, layered ACO-OFDM (LACO-OFDM) constitutes a promising spectral-efficient modulation technique for VLC. However, dimming by integrating the industry-preferred pulsewidth modulation (PWM) to the LACO-OFDM scheme induces severe clipping noise due to the nonlinearity of LEDs. In this paper, we conceive a reconstructed LACO-OFDM (RLACO-OFDM) scheme incorporating the PWM technique for VLC to accommodate the dimming demands for indoor illumination, while maintaining a spectral-efficient communication link. Moreover, superior to its counterparts, the transmitted symbols in the RLACO-OFDM based VLC system can be readily recovered by a standard LACO-OFDM receiver while no additional detection of the PWM signal is required, which reduces the receiver complexity. Numerical results demonstrate that the proposed RLACO-OFDM is capable of realizing high spectral efficiency over a broad dimming range.

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Published date: 1 February 2019
Keywords: asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM), dimming control, layered ACO-OFDM, pulse width modulation (PWM), Visible light communication (VLC)

Identifiers

Local EPrints ID: 430594
URI: https://eprints.soton.ac.uk/id/eprint/430594
ISSN: 1943-0655
PURE UUID: 31207053-75db-4de1-bf2a-acd64d808f30

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Date deposited: 03 May 2019 16:30
Last modified: 09 Dec 2019 17:43

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