TY - JOUR
T1 - Joint Dimming Control and Optimal Power Allocation for THO-OFDM Visible Light Communications
AU - Ji, Han
AU - Zhang, Tian
AU - Qiao, Shuang
AU - Ghassemlooy, Zabih
N1 - This work was supported in part by the Foundation for Excellent Young Talents of Jilin Province under Grant 20190103010JH, and in part by the National Natural Science Foundation of China under Grant 11905028.
PY - 2021/8
Y1 - 2021/8
N2 - Layered or hybrid optical orthogonal frequency division multiplexing (OFDM) has been proposed for use in optical communications due to its excellent spectral and power efficiencies, especially in visible light communications (VLC). However, most of the current works concentrate on transmitter and receiver design as well as the quality of service in communication networks. In this paper, we propose a spectrum-efficient dimmable triple-layer hybrid optical OFDM (DTH-OFDM) scheme to tackle the illumination requirements, considering different practical indoor VLC scenarios from low illumination to high illumination intensities. In the proposed DTH-OFDM scheme, the required dimming level is achieved by jointly adjusting the dimming factors and direct current bias. We investigate the comprehensive performance analysis of the proposed DTH-OFDM in detail, including probability density function, bit error rate (BER), spectral and energy efficiencies. In addition, a joint dimming control and optimal power allocation problem for DTH-OFDM is formulated and solved using convex optimization under the constraints of light emitting diode (LED) nonlinearity, dimming target and communications reliability. Numerical results show that, the proposed DTH-OFDM can offer continuous and arbitrary dimming target with higher spectral efficiency and lower BER compared with its counterparts, as well as an enhanced tolerance to the LED nonlinearity.
AB - Layered or hybrid optical orthogonal frequency division multiplexing (OFDM) has been proposed for use in optical communications due to its excellent spectral and power efficiencies, especially in visible light communications (VLC). However, most of the current works concentrate on transmitter and receiver design as well as the quality of service in communication networks. In this paper, we propose a spectrum-efficient dimmable triple-layer hybrid optical OFDM (DTH-OFDM) scheme to tackle the illumination requirements, considering different practical indoor VLC scenarios from low illumination to high illumination intensities. In the proposed DTH-OFDM scheme, the required dimming level is achieved by jointly adjusting the dimming factors and direct current bias. We investigate the comprehensive performance analysis of the proposed DTH-OFDM in detail, including probability density function, bit error rate (BER), spectral and energy efficiencies. In addition, a joint dimming control and optimal power allocation problem for DTH-OFDM is formulated and solved using convex optimization under the constraints of light emitting diode (LED) nonlinearity, dimming target and communications reliability. Numerical results show that, the proposed DTH-OFDM can offer continuous and arbitrary dimming target with higher spectral efficiency and lower BER compared with its counterparts, as well as an enhanced tolerance to the LED nonlinearity.
KW - orthogonal frequency division multiplexing (OFDM)
KW - dimming control
KW - power allocation
KW - convex optimization
KW - visible light communication
KW - Dimming control
KW - Convex optimization
KW - Orthogonal frequency division multiplexing (ofdm)
KW - Power allocation
KW - Visible light communication
KW - OFDM
KW - Pulse width modulation
KW - Optical transmitters
KW - Orthogonal frequency division multiplexing (OFDM)
KW - Lighting
KW - Adaptive optics
KW - Resource management
UR - http://www.scopus.com/inward/record.url?scp=85104652900&partnerID=8YFLogxK
U2 - 10.1109/tcomm.2021.3074977
DO - 10.1109/tcomm.2021.3074977
M3 - Article
VL - 69
SP - 5352
EP - 5366
JO - IEEE Transactions on Communications
JF - IEEE Transactions on Communications
SN - 1558-0857
IS - 8
M1 - 9410623
ER -