Joint Dimming and Data Transmission Optimization for Multi-User Visible Light Communication System

Visible light communication (VLC) is regarded as a promising technology for indoor communications due to its safety, availability, and efficiency. By deploying multiple light-emitting diodes (LEDs) at the transmitter, high data rate can be achieved. On the other hand, the dimming control is necessary in VLC systems to meet the lighting requirements, and puts an additional constraint to the system design. Thus, providing required communication quality while preserving the maximum dimming control capability becomes the baseline design philosophy for VLC systems. In this paper, we focus on multi-user multiple-input multiple-output VLC systems and propose a joint beamforming and direct current bias design. The proposed scheme can be formulated as an optimization problem and finds the minimum dimming level subject to the transmission rate requirement as well as the lighting constraints. Semi-definite program method and concave-convex procedure are exploited to solve the optimization problem efficiently. The impacts of locations of LEDs and users to the dimming control are also studied with numerical results.

[1]  Thomas D. C. Little,et al.  Impact of lighting requirements on VLC systems , 2013, IEEE Communications Magazine.

[2]  Lutz H.-J. Lampe,et al.  Visible Light Communications Using OFDM and Multiple LEDs , 2015, IEEE Transactions on Communications.

[3]  J. Armstrong,et al.  OFDM for Optical Communications , 2009, Journal of Lightwave Technology.

[4]  Parth H. Pathak,et al.  Visible Light Communication, Networking, and Sensing: A Survey, Potential and Challenges , 2015, IEEE Communications Surveys & Tutorials.

[5]  Dominic C. O'Brien,et al.  High data rate multiple input multiple output (MIMO) optical wireless communications using white led lighting , 2009, IEEE Journal on Selected Areas in Communications.

[6]  Qi Wang,et al.  Asymmetrical Hybrid Optical OFDM for Visible Light Communications With Dimming Control , 2015, IEEE Photonics Technology Letters.

[7]  Masao Nakagawa,et al.  Wireless optical transmissions with white colored LED for wireless home links , 2000, 11th IEEE International Symposium on Personal Indoor and Mobile Radio Communications. PIMRC 2000. Proceedings (Cat. No.00TH8525).

[8]  Robert J. Baxley,et al.  Multi-user MISO broadcasting for indoor visible light communication , 2013, 2013 IEEE International Conference on Acoustics, Speech and Signal Processing.

[9]  Harald Haas,et al.  Indoor optical wireless communication: potential and state-of-the-art , 2011, IEEE Communications Magazine.

[10]  Chi-Yi Lin,et al.  A Visible Light Communication Positioning Mechanism in Industrial Logistics Management , 2016, 2016 30th International Conference on Advanced Information Networking and Applications Workshops (WAINA).

[11]  Qi Wang,et al.  Multiuser MIMO-OFDM for Visible Light Communications , 2015, IEEE Photonics Journal.

[12]  Gert R. G. Lanckriet,et al.  On the Convergence of the Concave-Convex Procedure , 2009, NIPS.

[13]  Jiaheng Wang,et al.  Distributed user-centric scheduling for visible light communication networks. , 2016, Optics express.

[14]  Derrick Wing Kwan Ng,et al.  Hybrid visible light communications in Intelligent Transportation Systems with position based services , 2012, 2012 IEEE Globecom Workshops.

[15]  H. Kawano,et al.  A novel visible light communication system for enhanced control of autonomous delivery robots in a hospital , 2012, 2012 IEEE/SICE International Symposium on System Integration (SII).

[16]  Sridhar Rajagopal,et al.  IEEE 802.15.7 visible light communication: modulation schemes and dimming support , 2012, IEEE Communications Magazine.

[17]  Zhi-Quan Luo,et al.  Semidefinite Relaxation of Quadratic Optimization Problems , 2010, IEEE Signal Processing Magazine.

[18]  Alan L. Yuille,et al.  The Concave-Convex Procedure , 2003, Neural Computation.

[19]  Wei Xu,et al.  Rate-Maximized Zero-Forcing Beamforming for VLC Multiuser MISO Downlinks , 2016, IEEE Photonics Journal.

[20]  Yang Yang,et al.  An Enhanced DCO-OFDM Scheme for Dimming Control in Visible Light Communication Systems , 2016, IEEE Photonics Journal.

[21]  Rajendran Parthiban,et al.  Dimming schemes for visible light communication: the state of research , 2015, IEEE Wireless Communications.

[22]  Jiaheng Wang,et al.  Visible light communications in heterogeneous networks: Paving the way for user-centric design , 2015, IEEE Wireless Communications.

[23]  Robert J. Baxley,et al.  Joint Optimization of Precoder and Equalizer in MIMO VLC Systems , 2015, IEEE Journal on Selected Areas in Communications.

[24]  Jean Armstrong,et al.  Comparison of Asymmetrically Clipped Optical OFDM and DC-Biased Optical OFDM in AWGN , 2008, IEEE Communications Letters.

[25]  R. Horst,et al.  DC Programming: Overview , 1999 .

[26]  Mohammad Noshad,et al.  Hadamard-Coded Modulation for Visible Light Communications , 2014, IEEE Transactions on Communications.

[27]  Masao Nakagawa,et al.  Fundamental analysis for visible-light communication system using LED lights , 2004, IEEE Transactions on Consumer Electronics.

[28]  Joseph M. Kahn,et al.  Wireless Infrared Communications , 1994 .

[29]  Jiaheng Wang,et al.  Multiuser MISO Transceiver Design for Indoor Downlink Visible Light Communication Under Per-LED Optical Power Constraints , 2015, IEEE Photonics Journal.

[30]  Huaping Liu,et al.  MIMO-OFDM visible light communications system with low complexity , 2013, 2013 IEEE International Conference on Communications (ICC).