Dual-Purpose Offline LED Driver for Illumination and Visible Light Communication

Reproducing Single-Carrier Digital Modulation Schemes for VLC by Controlling the First Switching Harmonic of the DC–DC Power Converter Output Voltage Ripple

“…This modulation family has already been proposed for VLC and their benefits have been demonstrated in [23] and [50]- [57]. Since the method presented in this work is fully based on the use of DC-DC power converters (i.e., power efficient approach), the target is to improve the results achieved in [37] and [39] (i.e., power efficient approach reproducing an inefficient modulation scheme).…”

“…It is important to note that PSK, ASK and QAM have a higher spectral efficiency than the Variable Pulse Position Modulation (VPPM) scheme reproduced in [37] and [39]. Therefore, these single-carrier digital modulation schemes provide higher data rates using the same bandwidth, being QAM the one that achieves the highest spectral efficiency.…”

“…In each one of these slots, a pulse can be transmitted. The VPPM scheme reproduced in [37] and [39] considers two symbols: the pulse can be placed at the beginning or at the end of the symbol period. Consequently, each VPPM symbol transmits 1 bit.…”

“…As it is explained in the Section II.E, the target of this research is to improve the results achieved in [37] and [39] (i.e., power efficient approach reproducing an inefficient modulation scheme), alleviating the trade-off between communication and power efficiency. Due to the high fSW required, the power losses of the HB-LED drivers for VLC are dominated by the switching losses.…”

Performance evaluation of a VLC transmitter based on the split of the power

“…Two main approaches can be found in the literature. The first one consists in generating light pulses for transmitting the information [9]- [10] [see Fig. 1(a)].…”