Joint Dimming Control and Optimal Power Allocation for THO-OFDM Visible Light Communications

Layered or hybrid optical orthogonal frequency division multiplexing (OFDM) has been proposed for use in communications due to its excellent spectral and power efficiencies, especially visible light (VLC). However, most of the current works concentrate on transmitter receiver design as well quality service communication networks. In this paper, we propose a spectrum-efficient dimmable triple-layer OFDM (DTH-OFDM) scheme tackle illumination requirements, considering different practical indoor VLC scenarios from low high intensities. DTH-OFDM scheme, required dimming level is achieved by jointly adjusting factors direct bias. We investigate comprehensive performance analysis detail, including probability density function, bit error rate (BER), energy efficiencies. addition, joint control optimal allocation problem formulated solved using convex optimization under constraints emitting diode (LED) nonlinearity, target reliability. Numerical results show that, can offer continuous arbitrary with higher efficiency lower BER compared counterparts, an enhanced tolerance LED nonlinearity.