Department of Electrical and Electronics Engineering

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Author: search.filters.author.Bitragunta, SainathSubject: search.filters.subject.Performance analysis

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Now showing 1 - 5 of 5
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    A Novel Hybrid FSO/mmWave/RF System Design and Analysis for Next Generation Wireless Communication
    (IEEE, 2019) Bitragunta, Sainath
    With the increasing demand for faster data rate along with the integration of a wide range of devices to the network, there is a necessity to explore new paradigms of wireless communication. Homogeneous physical layer communication, such as RF, laser, optical Fiber, are morphing into a hybrid combination amongst each other to improve the service provided to the large variety of devices. In this paper, we focus on designing and analyzing the hybrid communication model that uses radio frequency (RF) electromagnetic waves, millimeter Waves (mmWaves), and free-space optical (FSO) waves for reliable communication. Specifically, for the proposed model, we analyze the overall spectral efficiency between the source and destination nodes aided by a variable gain AF relay and consequently obtain the optimal relay placement between the source and destination to maximize the overall spectral efficiency. Finally, we analyze the proposed system under different channel conditions between the source, relay, and destination and also obtain numerical results to validate and strengthen the analysis.
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    Interference-Constrained Power Adaptive Decode-and-Forward Relaying Policy: Design and Performance Analysis
    (IEEE, 2020) Bitragunta, Sainath
    Power adaptation is a feasible and promising solution to avoid interference at the primary, caused by transmissions of secondary underlay cooperative spectrum sharing systems. For it, we propose a novel interference-constrained power adaptive decode-and-forward (IC-PADnF) relaying policy jointly with a simple probabilistic relay selection (PRS) policy. The proposed IC-PADnF relaying policy, apart from acting as a regenerative relay, adaptively sets its transmit power and gain to optimize the underlay cooperative spectrum sharing system's performance. Further, the relay selection policy is easy to implement due to less channel state information (CSI) requirements. To evaluate the proposed IC-PADnF policy's performance, we derive analytical expressions for optimal fading averaged spectral efficiency and optimal fading averaged energy efficiency. We also obtain upperbound to these essential performance measures. We perform Monte-Carlo simulations to validate the derived analytical results. Furthermore, we compared the proposed policy with benchmark policies to explicitly show the performance improvements and its applicability for cooperative spectrum sharing systems and networks. Lastly, we find that IC-PADnF relaying policy jointly with PRS policy outperforms the benchmark policies.
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    Millimeter Wave Wireless System Modeling with Best Channel Selection Policy
    (IEEE, 2020) Bitragunta, Sainath
    Millimeter-wave (mmWave) technology is one of the most popular enabling technologies in the fifth-generation and beyond wireless systems. MmWave technology provides substantial extra bandwidth to address high data rate requirements for various terrestrial mobile systems. High propagation attenuation and channel fading are the main challenges of mmWave communication. In this paper, we consider mmWave non-cooperative and cooperative system models and propose the best mmWave channel selection policy (BMCSP). For these two systems, we study the performance of the proposed BMCSP. Specifically, we present useful mathematical analysis for the average spectral efficiency (SE) of both non-cooperative and cooperative mmWave systems in the Nakagami fading scenario. To quantify the gains delivered by BMSCP, we compare its average SE performance with that of the randomly selected channel. We find that the proposed policy provides superior performance in terms of average spectral efficiency.
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    Green Satellite Communication Link Design, Optimization, and Performance Analysis
    (IEEE, 2020) Bitragunta, Sainath
    The explosive growth in high data rate applications has led to increased satellite communication systems and network energy requirements. Therefore, it is essential to design green or energy-efficient satellite communication links to utilize limited energy sources. In this paper, we consider the low earth orbit (LEO) satellite links and investigate energy efficiency optimization and energy efficiency-outage probability. Specifically, we obtain insightful inequalities for the end-to-end energy efficiency of satellite links. We then investigate the energy efficiency (EE) and outage probability based on EE. Considering typical LEO satellite link parameters, we numerically investigate its performance and determine optimal transmit power to achieve maximum energy efficiency. We believe that this study is useful for designing optimal green satellite communication links in low earth orbits.
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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.