http://repository.iiitd.edu.in/xmlui/handle/123456789/140 ECE Wed, 14 Oct 2026 23:40:30 GMT 2026-10-14T23:40:30Z http://repository.iiitd.edu.in/xmlui/handle/123456789/2173 Title: Sunlight to signals: solar panel as an optical wireless communication receiver for sustainable communication systems Authors: Rahul; Bohara, Vivek Ashok (Advisor); Srivastava, Anand (Advisor) Abstract: The increasing adoption of intelligent transportation systems, smart cities, and energy-efficient wireless networks has further fueled the need for communication technologies that are not only high-speed and reliable but also sustainable and economical. Optical wireless communication (OWC) has been identified as a promising addition to existing radio frequency technologies because of its vast unregulated bandwidth, security features, and resistance to electromagnetic interference. However, the use of traditional optical receivers like photodiodes and avalanche photodiodes is accompanied by the need for separate power sources and is also prone to performance degradation due to high ambient light intensities, smaller receiver area, and the need for a complex optical design at the receiver to collect more energy, therefore increasing the system cost. In recent years, solar panels have gained attention as promising alternatives to conventional optical receivers because they can harvest energy and receive data at the same time. Although photovoltaic devices are primarily designed for power generation, their large sensing area, tolerance to strong ambient light, and widespread availability make them appealing for use in sustainable optical wireless communication systems. However, the inherent electrical properties of commercial silicon solar panels—such as high junction capacitance, which results in limited bandwidth—create major obstacles for achieving high data rates. In addition, much of the existing research has been limited to custom-built photovoltaic devices, controlled laboratory environments, or short-range indoor setups. As a result, the potential of commercially available solar panels for practical, real-world communication applications remains an unexplored research area. This thesis explores the feasibility, design, and optimization of solar panels as optical receivers, with a main emphasis on the use of commercial silicon solar panels and light emitting diode (LED) transmitters for reliable communication. This thesis systematically examines the communication performance of solar panel receivers, derives the bandwidth and sensitivity limits, and introduces new analog front-end designs to improve optical receiver communication performance. The first part of this thesis presents an in-depth experimental study of silicon solar pan els used as communication receivers under various optical and electrical conditions. The performance of solar panel receivers in terms of frequency response, time-domain response, received optical power sensitivity, and communication distance is examined. The effects of transmission distance, optical irradiance, modulation frequency, and ambient light on system performance are comprehensively explored. These experiments show that, although solar panels have very limited bandwidth, their performance can be greatly improved by proper analog signal processing. To overcome these challenges, this thesis develops and experimentally validates new analog front-end receiver designs specifically optimized for commercial solar panels. The proposed architectures employ carefully engineered impedance matching, filtering, and amplification techniques to extend the usable communication bandwidth beyond the photovoltaic device’s inherent electrical limitations. In contrast to earlier approaches based on reverse-biased operation or custom-fabricated receivers, the proposed solutions remain fully compatible with energy harvesting and are built entirely from off-the-shelf components, making them more practical for real-world deployment. Experimental evaluations show significant gains in both bandwidth and achievable data rates, enabling dependable optical communication with standard indoor LED sources under realistic operating conditions. The thesis also investigates simultaneous light information and power transfer (SLIPT) using solar panel–based receivers, with particular attention to the trade-off between harvested energy and communication quality. By examining multiple operating points and receiver configurations, this work offers valuable insight into joint optimization strategies that balance power collection with data throughput. These findings support the development of self-powered or energy-assisted optical wireless systems aimed at low-power and sustainable communication applications. In addition to the indoor environment, this thesis also encompasses the uncharted area of optical wireless communication in vehicular systems with solar-panel receivers. The vehicular system poses distinct challenges, including mobility issues, misalignment, limited orientation, and dead zones. The experimental work of this thesis explores these challenges and validates the use of solar panel receivers in vehicular communication systems, including vehicle-to vehicle and vehicle-to-infrastructure communication. The discussion emphasizes the significant shortcomings of current receiver designs and the need for orientation-resilient, robust receivers in dynamic environments. Overall, this thesis makes the following key contributions: (i) a comprehensive experimen tal characterization of commercial silicon solar panels as optical communication receivers, (ii) the design and validation of novel analog front-end circuits that significantly enhance communication bandwidth using off-the-shelf components, (iii) an in-depth investigation of SLIPT trade-offs in solar panel–based receivers, and (iv) an early exploration of vehicular optical wireless communication using solar panels, identifying open challenges and future research directions. By bridging the gap between laboratory demonstrations and real-world deployment, this work establishes solar panels as viable, sustainable, and low-cost optical receivers, paving the way for their integration into future intelligent transportation systems and energy-efficient wireless networks. Tue, 01 Sep 2026 00:00:00 GMT http://repository.iiitd.edu.in/xmlui/handle/123456789/2173 2026-09-01T00:00:00Z http://repository.iiitd.edu.in/xmlui/handle/123456789/2172 Title: Performance analysis of intelligent reflecting surface assisted underwater wireless optical communication systems Authors: Salam, Rehana; Bohara, Vivek Ashok (Advisor); Srivastava, Anand (Advisor) Abstract: The rapid growth of underwater applications such as ocean exploration, environmental mon itoring, offshore industries, and maritime defense has created a strong demand for reliable and high-data-rate underwater communication systems. Among the available technologies, underwater wireless optical communication (UWOC) has emerged as a promising solution due to its large bandwidth and low latency compared to conventional acoustic and radio-frequency (RF) systems. However, the performance of UWOC is significantly affected by absorption, scattering, oceanic turbulence, beam misalignment, and frequent link blockages. In addition, maintaining reliable communication in non-line-of-sight (NLoS) conditions remains a critical challenge in practical underwater environments. To overcome these limitations, this thesis investigates intelligent reflecting surface (IRS) assisted architectures for enhancing the performance of UWOC systems. The work begins with the analysis of a hybrid RF–UWOC framework, where a programmable RF-based IRS is employed to improve the terrestrial RF link prior to underwater optical transmission. The results demonstrate that IRS-assisted systems provide improved spectral efficiency (SE) and energy efficiency (EE) compared to conventional relaying approaches. Building on this foundation, the thesis develops optical intelligent reflecting surface (OIRS) assisted UWOC systems using mechanically adjustable mirror arrays (MAs) to enable passive beam steering and efficient NLoS communication. A comprehensive analytical framework is established to evaluate key performance metrics, including SE, EE, outage probability (OP), and bit error rate (BER) under realistic underwater channel conditions. The results show that OIRS-assisted systems significantly outperform conventional techniques such as plane mirror surfaces (PMS) and total internal reflection (TIR)-based approaches. The work is further extended to multi-user UWOC scenarios, where efficient resource allocation becomes essential. To address this, intelligent mirror allocation strategies, namely distance-based mirror assignment (DMA) and equal mirror assignment (EMA) , are proposed to improve system throughput and user fairness. The performance of these strategies is analyzed in conjunction with multiple access schemes such as orthogonal multiple access (OMA), non orthogonal multiple access (NOMA), and rate-splitting multiple access (RSMA), demonstrating improved multi-user performance under varying channel conditions. Furthermore, advanced optical architectures, including optical simultaneously transmitting and reflecting IRS (OSTAR-IRS) and liquid-crystal-based OSTAR-IRS (LC-OSTAR-IRS), are introduced to enable enhanced flexibility and adaptive beam control. Optimization frameworks are developed to efficiently design transmission and reflection parameters, improving overall system performance in dynamic environments. Extensive simulation results validate the proposed analytical models and demonstrate significant improvements in reliability, SE, and EE. Overall, this thesis establishes OIRS assisted UWOC systems as effective and practical solutions for next-generation underwater communication networks, providing both theoretical insights and design guidelines for high capacity and energy-efficient underwater connectivity. Tue, 01 Sep 2026 00:00:00 GMT http://repository.iiitd.edu.in/xmlui/handle/123456789/2172 2026-09-01T00:00:00Z http://repository.iiitd.edu.in/xmlui/handle/123456789/2166 Title: IFHP- tindering dataset Authors: Singh, Amanpreet; Daipuria, Aditya; Sethi, Tavpritesh (Advisor) Abstract: This project focuses on the SNOMED-CT mapping of over 9000 cancer-related datasets from Figshare and more than 2 million datasets from Zenodo FAIR Stations. The data was extracted from online sources using custom scripting, followed by the implementation of a multi-stage an alytical pipeline. This pipeline encompassed data cleaning, preprocessing, K-means clustering, word cloud generation, calculation of Jaccard and Kullback-Leibler divergence, and Bayesian Network modeling. Additionally, the BERT Sentence Model was utilized for calculating cosine scores to enhance the analysis. This comprehensive approach aimed to improve the accuracy and efficiency of SNOMED-CT mapping in cancer research, facilitating better data integration and interoperability within the medical and research communities. Our results demonstrate the effectiveness of these methods in handling large-scale datasets and providing valuable insights into cancer-related data. Thu, 25 Jul 2024 00:00:00 GMT http://repository.iiitd.edu.in/xmlui/handle/123456789/2166 2024-07-25T00:00:00Z http://repository.iiitd.edu.in/xmlui/handle/123456789/2161 Title: STEM sparkle Authors: Tiwari, Hariom; Kumar, Gautam; Grover, Anuj (Advisor) Abstract: This report outlines the conceptualization, development, and field execution of STEM Sparkle, an edutainment startup initiative aimed at nurturing scientific temperament and curiosity among young learners aged 5 to 14. The project is being pursued as part of our B.Tech Project (BTP) under the Entrepreneurship track. STEM Sparkle offers live interactive science shows, DIY activity workshops, and engaging science stations through birthday parties, school collaborations, and public events such as those in malls and residential societies. In our pilot execution at IIIT Delhi's summer camp, we operated under the name "Mystery Lab," which received overwhelming appreciation. The event demonstrated that children resonate more with playful, themed identities. This report comprehensively documents the journey from ideation to pilot implementation. It includes planning, brand strategy, operational logistics, content development, stakeholder engagement, and evaluation metrics. The vision going forward is to scale the startup through franchise partnerships, online DIY kits, and curriculum-integrated modules for schools. Sun, 20 Jul 2025 00:00:00 GMT http://repository.iiitd.edu.in/xmlui/handle/123456789/2161 2025-07-20T00:00:00Z