Spectral-Efficient Reconstructed LACO-OFDM Transmission for Dimming Compatible Visible Light Communications

IEEE Photonics Journal

卷:11

Baolong Li¹  Zhengquan Li¹  Wei Xu²  Simeng Feng³ 

[1] Jiangsu Provincial Engineerinig Laboratory of Pattern Recognition and Computational Intelligence, Jiangnan University, Wuxi, China;

[2] National Mobile Communication Research Laboratory, Southeast University, Nanjing, China;

[3] Next Generation Wireless, School of Electronics and Computer Science, University of Southampton, UK;

关键词: Visible light communication (VLC);    dimming control;    pulse width modulation (PWM);    asymmetrically clipped optical orthogonal frequency division multiplexing (ACO-OFDM);    layered ACO-OFDM;   

DOI  :  10.1109/JPHOT.2019.2892849

来源: DOAJ

【 摘 要 】

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.

【 授权许可】

Unknown