Efficient Amplitude Modulator and Ripple Canceller for Visible Light Communication

Arulandu, Kumar; Linnartz, Jean-Paul M. G.; Deng, Xiong

doi:10.1109/glocomw.2018.8644210

Cited by 3 publications

(1 citation statement)

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“…This VLC-LED driver is simple and high-power efficient (higher than 90%). Only Pulse-Based Modulation (PBM) schemes can be reproduced using this solution [6][7][8][9]; however, PBM schemes are not the best option for providing a high bit-rate and for avoiding the multipath issue (an issue arising from the different paths that the light rays can follow from the light focus to the receiver). Although some PBM proposed solutions achieve a very high bit-rate (10 Mbps) at higher power levels associated with the light emitted for communications (up to 10 W) [8,9], they are far from the theoretically achievable bit-rate using advanced modulation schemes.…”

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confidence: 99%

Adapting Techniques to Improve Efficiency in Radio Frequency Power Amplifiers for Visible Light Communications

et al. 2020

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It is well known that modern wireless communications systems need linear, wide bandwidth, efficient Radio Frequency Power Amplifiers (RFPAs). However, conventional configurations of RFPAs based on Class A, Class B, and Class AB exhibit extremely low efficiencies when they manage signals with a high Peak-to-Average Power Ratio (PAPR). Traditionally, a number of techniques have been proposed either to achieve linearity in the case of efficient Switching-Mode RFPAs or to improve the efficiency of linear RFPAs. There are two categories in the application of aforementioned techniques. First, techniques based on the use of Switching-Mode DC–DC converters with a very-fast-output response (faster than 1 µs). Second, techniques based on the interaction of several RFPAs. The current expansion of these techniques is mainly due to their application in cellphone networks, but they can also be applied in other promising wireless communications systems such as Visible Light Communication (VLC). The main contribution of this paper is to show how Envelope Tracking (ET), Envelope and Elimination (EER), Outphasing, and Doherty techniques can be helpful in developing more efficient VLC transmitters capable of reaching high bit-rates (higher than 1 Mbps) by using advance modulation schemes. Finally, two examples based on the application of the Outphasing technique and the use of a Linear-Assisted Envelope Amplifier (EA) to VLC are presented and experimentally verified.

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confidence: 99%