Research in Visible Light Communication Systems with OpenVLC1.3

Galisteo, Ander; Juara, Diego; Giustiniano, Domenico

doi:10.1109/wf-iot.2019.8767252

Cited by 50 publications

(24 citation statements)

References 10 publications

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“…The tag has been designed with the components shown in Table 4.2. On the infrastructure's side we use a BeagleBone Black (BBB) and the software and firmware of OpenVLC [2]. We modulate the data to a General Purpose Input/Output (GPIO).…”

Section: Discussionmentioning

confidence: 99%

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Galisteo

Wang

et al. 2017

Proceedings of the 4th ACM Workshop on Visible Light Communication Systems

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viii large have to face. Still, when I joined, it felt like a small group of people that were excited to research and push the borders of knowledge, always laughing, joking, going to Piratas Rock Wey for lunch (the best restaurant in Madrid) and attending table tennis tournaments. I even won one of those! (I did technically not, but I got a T-shirt, which is nice). The coffee breaks, the memes, the discussions... Will be with me forever. Special thanks to all the people from IMDEA and Comunidad de Madrid that helped me with my communication activities, a not so valued part of the research life that I believe is one of the paths to bring science to society.The second group is the people from La Caixa scholarship. Getting the La Caixa grant was not only good for the monetary appraisal itself (although that was not bad) but also because of the people I met. The annual retreats that we did were a breath of fresh air where I could interact with non-engineer scientists, which is surprisingly tricky when you are an engineer. My admiration and love for them are immeasurable. And of course, to the people from La Caixa organization itself, they treated us way better than what I would have expected in the best of my dreams.As an honorable mention, I should thank all the people that I interacted with in University of Uppsala, Sweden. Coming from a mediterranean country, their warm hearts compensated the cold climatology.Of course, thank you to my girlfriend, my family, and friends to support me when I was not in my best moments and for celebrating with me the sweetest of my victories. This thesis is yours too.Finally, to anyone reading this starting its Ph.D.: the thesis is longer than it looks.Once you start, there are no breaks until you defend it or drop it, so try to find your pace, do not rush for an ending that is too far. Deadlines come and go, but your mental health is yours only. Take care of it; take care of yourself.

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Section: Discussionmentioning

confidence: 99%

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Galisteo

Wang

et al. 2017

Proceedings of the 4th ACM Workshop on Visible Light Communication Systems

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“…The basic modulation scheme we use is On-Off-Keying (OOK) with Manchester Coding. In each enabled chain, the LED is turned ON/OFF at a frequency of 1 MHz, same as the latest version of the popular open-source VLC platform OpenVLC [17]. In one of the experiments, we also employ three chains to implement a multi-level (4-level) modulation scheme for evaluation.…”

Section: Methodsmentioning

confidence: 99%

“…To decode a frame from the captured signal, we first need to detect the preamble and calculate the symbol period. A commonly used preamble in VLC is a list of consecutive alternating ON/OFF symbols [17,18,38], as shown in Figure 11. The rising/falling edges appear at the ON→OFF and OFF→ON transitions, respectively.…”

Section: Decoding Miso/siso Datamentioning

confidence: 99%

Breaking the limitations of visible light communication through its side channel

Cui

Wang

Xiong

2020

Proceedings of the 18th Conference on Embedded Networked Sensor Systems

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Visible Light Communication (VLC) is a promising technology for future wireless communications. By modulating the visible lightthat has about 10,000x larger frequency band than that of radios-to transmit data, VLC has the potential to provide ultra-high-speed wireless connectivities. However, it also has limitations such as i) surrounding objects can easily block VLC links, and ii) intense ambient light can saturate the photodiodes of VLC receivers.In this work, from a different angle compared with state-ofthe-art solutions, we utilize the side channel of VLC-a Radio Frequency (RF) channel created unintentionally during the transmission process of VLC-to break the above-mentioned VLC limitations.The key enabler is that the side RF channel also contains the data information transmitted in the VLC link. When the VLC link is blocked or saturated, we can utilize the side channel, capable of penetrating through blockages and not affected by ambient light, to assist VLC transmissions. Thus a user service relying on VLC transmissions will not be interrupted. Besides the simple Single-Input Single-Output (SISO) case, we consider challenging scenarios where multiple VLC chains are synchronized to form Multiple-Input Multiple/Single-Output (MIMO/MISO) transmission strategies. To make our system practical, we address several challenges spanning from hardware to software. Compared to state-of-the-art design, we reduce the size of the receiving coil by nearly 90%. Experimental evaluations show that our system can decode overlapped RF signals created by a 3×3 MIMO VLC network five meters away, with various blockages in between. Our system also works under intense ambient light conditions (>100,000 lux).

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“…One of the first and most advanced software defined open platforms for Visible Light Communication is OpenVLC [21], where the authors highlight the importance and difficulty of synchronization between a receiver and a transmitter in a bi-directional VLC system. The approach considered by the authors to avoid mistiming issue consists in oversampling.…”

Section: B Goals and Organization Of The Workmentioning

confidence: 99%

Adaptive Modulation Control for Visible Light Communication Systems

Costanzo

Loscrì

Biagi

2021

J. Lightwave Technol.

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Visible light communication (VLC) builds on the dual use of lightening infrastructure for communication. Even though the advantages of VLC are well known, as emerging communication paradigm, some open issues still need to be addressed in order to rely on it as a robust communication system. First of all, external interference as an extremely varying signal impacting on the reliability of the VLC system needs to be analyzed. In this paper, we propose a system where the link conditions (in terms of signal-to-noise-ratio (SNR)) drive the modulation scheme and this procedure is managed through the use of an uplink/channel, to assure a feedback path. The receiver is in charge of choosing the modulation scheme matching the requirement in terms of error rate on the basis of the measured SNR after noise mitigation. The feasibility of the system and its effectiveness are evaluated by designing and implementing a complete bi-directional system. In particular, an uplink channel sending the information regarding the specific selected modulation technique has been implemented and the whole system is based on a fine synchronization approach in order to "track" in real time the most suitable modulation scheme. Experimental results show the effectiveness of a bi-directional system in order to implement an adaptive VLC system able to follow the environmental changes (in terms of interference and noise).

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Research in Visible Light Communication Systems with OpenVLC1.3

Cited by 50 publications

References 10 publications

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Breaking the limitations of visible light communication through its side channel

Adaptive Modulation Control for Visible Light Communication Systems

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