Conference Papers

Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506

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Author: search.filters.author.Salvi, S.Subject: search.filters.subject.Visible light communication

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    Design, Implementation, and Evaluation of a Low-Cost Visible Light Communication Testbed
    (Springer Science and Business Media Deutschland GmbH, 2024) Salvi, S.; Geetha, V.
    The proposed testbed demonstrated and studied the behavior of channels and modulation techniques. Modulation techniques such as On-Off Keying (OOK) and Pulse Duration Modulation (PDM) were implemented on the testbed. Their performance was evaluated based on the distance between the transmitter and receiver, bit rate, and accuracy. A free-space optical communication channel model was also implemented in MATLAB to study the impact of physical characteristics on channel performance. Physical factors such as room dimensions, LED power, and transmitter field of view (FoV) were considered for the simulation. Additionally, the results of the proposed testbed were compared with the standard indoor free-space optical communication channel model implemented in MATLAB. It was observed that the PDM modulation technique consistently provided a 2x improvement in accuracy over OOK modulation for the same distance. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.
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    Li-Fi for Secured Access to Wireless Network During Online Examination in Classrooms
    (Springer Science and Business Media Deutschland GmbH, 2024) Salvi, S.; Apune, S.; Gutte, V.; Gawade, M.; Kolkar, R.
    The traditional conduction of examinations needs to use physical copies of question paper and answer sheets, which are then evaluated by the evaluators. However, in a post-pandemic era, where the emphasis is more on the minimal usage of physically transferable materials, safe conduction of examinations in the classroom environments becomes challenging. Conduction of examination in complete online mode requires wireless access to the Wi-Fi access points; however, as the range of the Wi-Fi access point goes beyond the classrooms, there is the possibility of accessing the network from outside classroom which is not desired. With an aim to address these issues, in this paper a novel approach for providing dynamically changing passwords using visible light communication is designed, implemented and tested for connecting to the wireless network. The setup is useful in the environment where restricted physical access is needed to ensure system and network security. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.