Conference Papers
Permanent URI for this collectionhttps://idr.nitk.ac.in/handle/123456789/28506
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Item From Light to Li-Fi: Research Challenges in Modulation, MIMO, Deployment Strategies and Handover(Institute of Electrical and Electronics Engineers Inc., 2019) Salvi, S.; Geetha, V.With an increasing number of network-connected devices, there is a need for new and innovative ways of providing communication. Due to the over-usage of existing Radio Frequency(RF) spectrum, it is essential to explore other alternatives. A possible solution for reducing the load over RF spectrum for communication could be the usage of alternative 380 to 740 nanometers wavelength, i.e., Visible Light spectrum. It satisfies multiple objectives, such as provisioning of illumination and communication. Characteristics of channel and propagation medium have been studied to provide the required preliminary understanding of the problem domain. The primary research focuses on Li-Fi communication is in the area of modulation techniques and handover management. Various existing modulation techniques have been studied and compared with respect its performance parameters such as attainable bandwidth, spectral efficiency, noise ratio, and illumination. Different MIMO techniques, design requirement, deployment patterns, and Handover techniques have also been highlighted. This work provides open research challenges related to modulation techniques, MIMO, Handover, and Deployment Strategies for Li-Fi. © 2019 IEEE.Item LiCamPos : An Indoor Positioning System using Light to Camera Communication(Institute of Electrical and Electronics Engineers Inc., 2021) Salvi, S.; Geetha, V.; Praveen, K.; Kiran, C.; Nayaka, V.J.Due to the limitations of the Global Positioning System to track or locate ultra-small resolutions, Indoor Positioning System(IPS) came into existence. IPS is used to provide useful indoor location-based information. Mostly Radio Frequency (RF) based system is used to achieve IPS. However, alternatives to RF are getting popular due to the debatable health risks of RF. In this paper, a light-based camera communication technique for IPS is proposed and evaluated. The proposed method uses a light aperture to encode location beacon information and is decoded using image processing techniques on the user's mobile phone. An On-Off Keying (OOK) modulation technique is employed to encode and broadcast beacon information, and software-based custom modified mobile camera parameters are used for position estimation. A phenomenon called the "Rolling Shutter"effect is used to extract useful information from the beacon. During experimentation, it was observed that the number of observable rolling shutter stripes is inversely proportional to the distance between the beacon and the receiver, and it is directly proportional to the frequency of OOK. It was also observed that the stripe's width is independent of the distance between beacon and receiver. Finally, an android application is built to show location-relevant messages/ads based on the identified beacon. © 2021 IEEE.Item A Novel 2D LED Matrix and Aztec Pattern Inspired Optical Camera Communication for Industrial IoT(Institute of Electrical and Electronics Engineers Inc., 2022) Salvi, S.; Geetha, V.Recently, the problem of Radio Frequency saturation has become more prominent. It is due to the increased number of intelligent devices connected to the network. This paper proposes an Aztec pattern-inspired optical camera communication system with the motivation to provide an alternate communication system without compromising the number of connected devices in a typical industrial environment. The Signal-to-Noise Ratio is evaluated in the proposed system, and its intensity profile is studied. The proposed technique outperformed traditional QR code-inspired methods in terms of power consumption and Packet Error Rate(%). © 2022 IEEE.