Department of Electrical and Electronics Engineering

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Author: search.filters.author.Bitragunta, SainathSubject: search.filters.subject.Energy harvesting

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    Energy harvesting relay outage probability analysis of cooperative communication system over small and large scale fading channels
    (IEEE, 2017) Bitragunta, Sainath
    We consider an energy harvesting (EH) relay-assisted, two hop, cooperative communication system. For it, we analytically characterize EH relay outage probability when the source device transmissions undergo small scale fading as well as large scale fading. In the analysis, we develop simple yet insightful upper bound for the EH relay outage probability. Furthermore, we investigate asymptotic outage probability of EH relay. We validate our analytical results with Monte-Carlo simulations. Assuming other system parameters fixed, our results show that the EH relay outage probability decreases with the increase in the harvesting power.
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    Optimizing the Order of Modulation for Minimized Distortion in Green Communication Networks
    (IEEE, 2018) Bitragunta, Sainath
    Energy is required for transmission of data over a wireless channel. This energy can be obtained using fixed batteries or via harvesting energy. In this paper, we optimize the energy distribution to minimize the overall distortion in a wireless network. The network model has energy harvesting nodes which transmit data in a time division multiple access (TDMA) scheme. First, we establish a relation between allocated energy and normalized minimum distortion by assuming a fixed battery system. We then use this relation to optimize the energy distribution to minimize overall distortion in an energy harvesting system. Following that, we incorporate path loss in our model and simulate the system to decide the optimum order of quadrature amplitude modulation (QAM), given a bit error rate threshold. This work not only models efficient usage of harvested energy but also ensures optimal utilization of the available bandwidth, while minimizing overall distortion.
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    Energy Harvesting, Hybrid, Cooperative Wireless System Modeling and Outage Performance Analysis
    (IEEE, 2018) Bitragunta, Sainath
    We consider radio frequency-energy harvesting (RF-EH) non-cooperative system, and, an RF-EH relay-assisted, two hop, hybrid cooperative communication system that comprises of a digital link, and an analog link that uses phase modulation. For the two system models, we analytically characterize outage probability when the node transmissions undergo small scale fading as well as path loss. In the analysis, we develop simple yet insightful closed-form expressions for outage probability. We validate our analytical results with Monte-Carlo simulations. Our numerical results show that the outage can be significantly improved by using pre-emphasis and de-emphasis (PE-DE)
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    Energy Harvesting Cooperative Wireless Systems: Probabilistic Modeling and Statistical Analysis
    (IEEE, 2019) Bitragunta, Sainath
    In this work, we consider a two-hop cooperative wireless system that consists of multiple energy harvesting (EH) relays. The system uses a time-switching based relaying protocol for EH and information processing at the amplify-and-forward (AF) relay nodes. For it, we formulate an order statistics problem of finding the distribution of maximum energy harvested among several EH relay nodes by considering two different fading models, namely, path loss and Rayleigh fading model, path loss and shadow fading model. For these models, we derive analytical expressions for the mean value of maximum harvested energy distribution. Furthermore, we also present an insightful outage analysis and numerical results to validate the analytical expressions. The analysis that we present lead to an essential application of the best EH relay selection in EH cooperative wireless systems and networks.
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    Spectral Efficiency Optimization and Analysis of Time Switching-Based, Energy Harvesting Spectrum Sharing Cooperative Wireless System
    (IEEE, 2021) Bitragunta, Sainath
    Simultaneous wireless information and power transfer (SWIPT) has gained momentum as a novel and energy efficient technique to restore energy as well as transfer data in communication networks. In this paper, we consider an energy harvesting (EH) relay assisted collaborative wireless system which operates as a secondary network in underlay mode in a spectrum sharing environment. The collaborative system has a source node, a destination node, and multiple EH relays that are nonregenerative, interference-constrained, and use time-switching architecture to harvest energy and receive information from the source node. We select the relay with the maximum harvested energy for further transmission of data to the destination node. For the secondary cooperative EH system, we provide the average spectral efficiency analysis and propose an optimal time switching ratio policy for the selected EH relay that delivers superior performance than benchmark approaches, namely, the random selection and fixed time switching ratio approach. The proposed policy motivates its application in SWIPT based collaborative and spectrum sharing systems.