Energy efficient visible light communication transmitter based on the split of the power

IEEE Trans. Power Electron.

Miaja

et al. 2018

Self Cite

Abstract-and Phase-Shift Keying (PSK). These modulation schemes achieve higher spectral efficiency (i.e., more data can be transmitted using the same bandwidth) than previously proposed modulation schemes performed by VLC transmitters based on the use of DC-DC power converters. To the author's knowledge, the ratio between the bit rate achieved and the switching frequency of the DC-DC power converter presented in this paper is the highest that can be found in literature.

Section: A Methods Based On the Pulse-width Modulation Techniquementioning

confidence: 99%

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

IEEE Trans. Power Electron.

Miaja

et al. 2018

Self Cite

“…The architecture is made up of two DC-DC power converters in output-series connection [35]- [36]. The first one is a fast-response DC-DC converter that achieves a bandwidth high enough to reproduce the communication signal.…”

Section: Introductionmentioning

confidence: 99%

Power-Efficient VLC Transmitter Based on Pulse-Width Modulated DC–DC Converters and the Split of the Power

IEEE Trans. Power Electron.

Miaja

et al. 2019

Self Cite

Abstract-Visible Light Communication (VLC) has gained relevance during the last years. It consists in using High-Brightness LEDs (HB-LEDs) both for lighting and for transmitting information by changing the light intensity rapidly. However, there are some bottlenecks that are slowing down the deployment of this technology. One of the most important problems is that the HB-LED drivers proposed for addressing high data rates in VLC achieve poor power efficiency. Since these HB-LED drivers must be able to reproduce fast current waveforms, the use of Linear Power Amplifiers (LPAs) has been adopted, which clearly damages the power efficiency of HB-LED lighting.In order to alleviate this problem, a HB-LED driver made up of two DC-DC power converters is presented in this work. One of them is responsible for performing the communication functionality by operating at high switching frequency (10 MHz), whereas the second converter fulfills the illumination functionality by ensuring a certain biasing point. The split of the power allows us to minimize the power delivered by the fast-response DC-DC power converter, which suffers from high switching losses. Thus, the overall efficiency can be maximized for each particular communication scenario and for scenarios with changing conditions (i.e., mobile transmitter and/or receiver, presence of mobile obstacles, etc.). In this sense, how the lighting level and the communication signal power affect both the power efficiency and the communication efficiency is deeply analyzed in the experimental section. The implemented prototype achieves an overall efficiency around 90%. In addition, the proposed VLC transmitter is able to reproduce a wide range of digital modulation schemes, including the preferred one for wireless communications:Orthogonal Frequency Division Multiplexing (OFDM). Index Terms-High switching frequency, Orthogonal Frequency Division Multiplexing (OFDM), Visible Light Communication (VLC), High-Brightness LED (HB-LED), outputseries connection. I. INTRODUCTIONIRELESS communication is essential for the present and future society. A lot of emerging topics, such as the smart city concept or the development of the smartphones technology, promote the communication between humans and many devices placed into the environment. As a result, the mobile data traffic has grown exponentially during the last decade and it is expected that it keeps growing by 2021 [1]. However, enabling the predicted data traffic is not straightforward because the Radio Frequency (RF) spectrum is close to congestion.Visible Light Communication (VLC) is one of the most promising solutions for alleviating the problem [2]- [5]. It consists in using the High-Brightness LEDs (HB-LEDs) not only for lighting, but also for transmitting information by changing the light intensity rapidly. In this application, the light intensity has a DC component that determines the lighting level and an AC component that represents the transmitted information. Obviously, the light intensity modulation is fast enough to be u...

“…Some recent works have addressed the issue [11]- [15]. In [11], several VLC transmitters fully or partially based on the use of DC-DC power converters are proposed.…”

Section: (B)]mentioning

confidence: 99%

“…Fortunately, the multi-phase buck converter of the proposed architecture is focused on performing the small voltage variations while the synchronous buck converter provide most of vO-DC, thus facilitating the reproduction of vO(t). More details regarding the proposed HB-LED driver can be found in [15]. Regarding the drawbacks, the two isolated input voltages (i.e.…”

Section: B Proposed Architecturementioning

confidence: 99%

See 1 more Smart Citation

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

Aller

2018 IEEE Applied Power Electronics Conference and Exposition (APEC)

et al. 2018

Self Cite

Abstract-Visible Light Communication (VLC) has gained relevance during last years. It consists in using High-Brightness LEDs (HB-LEDs) both for lighting and for transmitting information changing the light intensity rapidly. However, there are some bottlenecks that are slowing down the deployment of this technology. One of the most important problems is that the HB-LED drivers proposed for addressing high data rates in VLC achieve poor power efficiency. Since these HB-LED drivers must be able to reproduce fast current waveforms, the use of Linear Power Amplifiers (LPAs) has been adopted, which clearly damage the power efficiency of HB-LED lighting. In order to alleviate this problem, a HB-LED driver made up of two DC-DC power converters is presented in this work. One of them is responsible for performing the communication functionality by operating at high switching frequency (10 MHz), whereas the second one fulfills the illumination functionality by ensuring a certain biasing point. The split of the power allows to minimize the power delivered by the fast-response DC-DC power converter. Thus, the efficiency can be maximized for scenarios with changing conditions (i.e., mobile transmitter and/or receiver, presence of mobile obstacles, etc.). In this sense, how the lighting level and the communication signal power affect both the power efficiency and the communication efficiency is deeply analyzed. The implemented prototype achieves an overall efficiency around 90%. In addition, the proposed VLC transmitter is able to reproduce a wide range of digital modulation schemes, including Orthogonal Frequency Division Multiplexing (OFDM).