Department of Electrical and Electronics Engineering

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Author: search.filters.author.Bitragunta, SainathSubject: search.filters.subject.Internet of Things (IoT)

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    Application of Game Theory to Cooperative Underlay Cognitive Radio IoT
    (IEEE, 2019) Bitragunta, Sainath
    Internet of things (IoT) is a new paradigm in wireless communication that offers a host of new opportunities to exploit the finite resources available. Cognitive radio networks (CRNs) employ these spectrum opportunities by using their inherent adaptive nature to automatically detect available channels in the spectrum and change transmission parameters to allow more communications to run concurrently, thus improving overall efficiency. The application of game theoretic principles to solving problems in this domain allows for the creation of fairly realistic models that clearly outline the relationship between the stakeholders involved, under the assumption of rationality. This paper presents a model for an IoT-based CRN in the underlay mode of operation. A triangular lattice with a set of relays is considered to model the secondary user network. The interference and power constraints accounted for in calculating the Nash equilibrium bring the model closer to direct applicability in the real world by including variations depending on channel strength and desirability.
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    A Survey of Energy and Spectrum Harvesting Technologies and Protocols for Next Generation Wireless Networks
    (IEEE, 2021-04) Bitragunta, Sainath; Chamola, Vinay; Joshi, Sandeep
    Energy harvesting (EH) and spectrum harvesting (SH) are two promising and useful green communication and networking mechanisms for the next-generation wireless networks. While the former techniques exploit ambient energy sources to scavenge energy, the latter exploit the unused or moderately used electromagnetic spectrum. With the advent of cyber-physical systems and the Internet-of-Things (IoT), the presence of tens of billions of low power sensor devices would soon be a reality. These small sensing devices would be present in many systems around us, such as home appliances, telecommunication devices, medical electronics, transport systems, etc. These miniaturized, low-power consuming devices may exploit EH and SH techniques for energy storage and communication. These EH-SH-enabled sensors or low-power nodes need to consume very little energy for sensing and communicating opportunistically. However, several theoretical problems and practical challenges exist in EH-SH communications. In this comprehensive survey paper, we first present the historical background of EH, and SH techniques, and their development over several decades. Specifically, we focus on EH-SH communication technologies and protocols for a wide range of systems and networks. We present a detailed survey of the various harvesting techniques and protocols from recent literature. Finally, we describe exciting open, intra-disciplinary, and inter-disciplinary challenges for further research on EH-SH communication technologies.