Download or read book Towards Robust and Reliable Communication for Millimeter Wave Networks written by Masoud Zarifneshat and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future generations of wireless networks benefit significantly from millimeter wave technology (mmW) with frequencies ranging from about 30 GHz to 300 GHz. Specifically, the fifth generation of wireless networks has already implemented the mmW technology and the capacity requirements defined in 6G will also benefit from the mmW spectrum. Despite the attractions of the mmW technology, the mmW spectrum has some inherent propagation properties that introduce challenges. The first is that free space pathloss in mmW is more severe than that in the sub 6 GHz band. To make the mmW signal travel farther, communication systems need to use phased array antennas to concentrate the signal power to a limited direction in space at each given time. Directional communication can incur high overhead on the system because it needs to probe the space for finding signal paths. To have efficient communication in the mmW spectrum, the transmitter and the receiver should align their beams on strong signal paths which is a high overhead task. The second is a low diffraction of the mmW spectrum. The low diffraction causes almost any object including the human body to easily block the mmW signal degrading the mmW link quality. Avoiding and recovering from the blockage in the mmW communications, especially in dynamic environments, is particularly challenging because of the fast changes of the mmW channel. Due to the unique characteristics of the mmW propagation, the traditional user association methods perform poorly in the mmW spectrum. Therefore, we propose user association methods that consider the inherent propagation characteristics of the mmW signal. We first propose a method that collects the history of blockage incidents throughout the network and exploits the historical blockage incidents to associate user equipment to the base station with lower blockage possibility. The simulation results show that our proposed algorithm performs better in terms of improving the quality of the links and blockage rate in the network. User association based only on one objective may deteriorate other objectives. Therefore, we formulate a biobjective optimization problem to consider two objectives of load balance and blockage possibility in the network. We conduct Lagrangian dual analysis to decrease time complexity. The results show that our solution to the biobjective optimization problem has a better outcome compared to optimizing each objective alone. After we investigate the user association problem, we further look into the problem of maintaining a robust link between a transmitter and a receiver. The directional propagation of the mmW signal creates the opportunity to exploit multipath for a robust link. The main reasons for the link quality degradation are blockage and link movement. We devise a learning-based prediction framework to classify link blockage and link movement efficiently and quickly using diffraction values for taking appropriate mitigating actions. The simulations show that the prediction framework can predict blockage with close to 90% accuracy. The prediction framework will eliminate the need for time-consuming methods to discriminate between link movement and link blockage. After detecting the reason for the link degradation, the system needs to do the beam alignment on the updated mmW signal paths. The beam alignment on the signal paths is a high overhead task. We propose using signaling in another frequency band to discover the paths surrounding a receiver working in the mmW spectrum. In this way, the receiver does not have to do an expensive beam scan in the mmW band. Our experiments with off-the-shelf devices show that we can use a non-mmW frequency band's paths to align the beams in mmW frequency.In this dissertation, we provide solutions to the fundamental problems in mmW communication. We propose a user association method that is designed for mmW networks considering challenges of mmW signal. A closed-form solution for a biobjective optimization problem to optimize both blockage and load balance of the network is also provided. Moreover, we show that we can efficiently use the out-of-band signal to exploit multipath created in mmW communication. The future research direction includes investigating the methods proposed in this dissertation to solve some of the classic problems in the wireless networks that exist in the mmW spectrum.

Download or read book Analysis and Optimization for Robust Millimeter Wave Communications written by Cristian Tatino and published by Linköping University Electronic Press. This book was released on 2021-01-13 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt: Spectrum scarcity is a longstanding problem in mobile telecommunications networks. Specifically, accommodating the ever-growing data rate and communications demand in the extensively used spectrum between 800 MHz and 6 GHz is becoming more challenging. For this reason, in the last years, communications in the millimeterwave (mm-wave) frequency range (30-300 GHz) have attracted the interest of many researchers, who consider mm-wave communications a key enabler for upcoming generations of mobile communications, i.e., 5G and 6G. However, the signal propagation in the mm-wave frequency range is subject to more challenging conditions. High path loss and penetration loss may lead to short-range communications and frequent transmission interruptions when the signal path between the transmitter and the receiver is blocked. In this dissertation, we analyze and optimize techniques that enhance the robustness and reliability of mm-wave communications. In the first part, we focus on approaches that allow user equipment (UE) to establish and maintain connections with multiple access points (APs) or relays, i.e., multi-connectivity (MC) and relaying techniques, to increase link failure robustness. In such scenarios, an inefficient link scheduling, i.e., over or under-provisioning of connections, can lead to either high interference and energy consumption or unsatisfied user’s quality of service (QoS) requirements. In the first paper, we propose a novel link scheduling algorithm for network throughput maximization with constrained resources and quantify the potential gain of MC. As a complementary approach, in the second paper, we solve the problem of minimizing allocated resources while satisfying users’ QoS requirements for mm-wave MC scenarios. To deal with the channel uncertainty and abrupt blockages, we propose a learning-based solution, of which the results highlight the tradeoff between reliability and allocated resource. In the third paper, we perform throughput and delay analysis of a multi-user mm-wave wireless network assisted by a relay. We show the benefits of cooperative networking and the effects of directional communications on relay-aided mm-wave communications. These, as highlighted by the results, are characterized by a tradeoff between throughput and delay and are highly affected by the beam alignment duration and transmission strategy (directional or broadcast). The second part of this dissertation focuses on problems related to mm-wave communications in industrial scenarios, where robots and new industrial applications require high data rates, and stringent reliability and latency requirements. In the fourth paper, we consider a multi-AP mm-wave wireless network covering an industrial plant where multiple moving robots need to be connected. We show how the joint optimization of robots’ paths and the robot-AP associations can increase mm-wave robustness by decreasing the number of handovers and avoiding coverage holes. Finally, the fifth paper considers scenarios where robot-AP communications are assisted by an intelligent reflective surface (IRS). We show that the joint optimization of beamforming and trajectory of the robot can minimize the motion energy consumption while satisfying time and communication QoS constraints. Moreover, the proposed solution exploits a radio map to prevent collisions with obstacles and to increase mm-wave communication robustness by avoiding poorly covered areas.

Download or read book Robust Communication and Optimization Over Dynamic Networks written by Can Karakus and published by . This book was released on 2018 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt: Many types of communication and computation networks arising in modern systems have fundamentally dynamic, time-varying, and ultimately unreliably available resources. Specifically, in wireless communication networks, such unreliability may manifest itself as variability in channel conditions, intermittent availability of undedicated resources (such as unlicensed spectrum), or collisions due to multiple-access. In distributed computing, and specifically in large-scale distributed optimization and machine learning, this phenomenon manifests itself in the form of communication bottlenecks, straggling or failed nodes, or running background processes which hamper or slow down the computational task. In this thesis, we develop information-theoretically-motivated approaches that make progress towards building robust and reliable communication and computation networks built upon unreliable resources. In the first part of the thesis, we focus on three problems in wireless networks which involve opportunistically harnessing time-varying resources while providing theoretical performance guarantees. First, we show that in full-duplex uplink-downlink cellular networks, a simple, low-overhead user scheduling scheme that exploits the variations in channel conditions can be used to optimally mitigate inter-user interference in the many-user regime. Next, we consider the use of intermittently available links over unlicensed spectral bands to enhance communication over the licensed cellular band. We show that channel output feedback over such links, combined with quantize-map-forward relaying, provides generalized-degrees-of-freedom gain in interference networks. We characterize the information-theoretic capacity region of this model to within a constant gap. We finally consider the use of such intermittent links in device-to-device cooperation to aid cellular downlink. We develop an optimal dynamic resource allocation algorithm for such networks using stochastic approximation and graph theory techniques, and show that the resulting scheme results in up to 5-6x throughput gain for cell-edge users. In the second part, we consider the problem of distributed optimization and machine learning over large-scale, yet unreliable clusters. Focusing on a master-worker architecture, where large-scale datasets are distributed across worker nodes which communicate with a central parameter server to optimize a global objective, we develop a framework for embedding redundancy in the dataset to combat node failures and delays. This framework consists of an efficient linear transformation (coding) of the dataset that results in an overcomplete representation, combined with a coding-oblivious application of a distributed optimization algorithm. We show that if the linear transformation is designed to satisfy certain spectral properties resembling the restricted isometry property, nodes that fail or delay their computation can be dynamically left out of the computational process, while still converging to a reasonable solution with fast convergence rates, obviating the need for explicit fault-tolerance mechanisms and significantly speeding up overall computation. We implement the techniques on Amazon EC2 clusters to demonstrate the applicability of the proposed technique to various machine learning problems, such as logistic regression, support vector machine, ridge regression, and collaborative filtering; as well as several popular optimization algorithms including gradient descent, L-BFGS, coordinate descent and proximal gradient methods.

Download or read book Proceedings of Second International Conference on Intelligent System written by João Manuel R. S. Tavares and published by Springer Nature. This book was released on with total page 588 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Reconfigurable Circuits and Technologies for Smart Millimeter Wave Systems written by Philippe Ferrari and published by Cambridge University Press. This book was released on 2022-05-26 with total page 457 pages. Available in PDF, EPUB and Kindle. Book excerpt: Describes the theory, modeling, and design of tunable mm-wave circuits and systems using CMOS, RF MEMS, and microwave liquid crystals.

Download or read book Next Generation Wireless Communication written by Mohammed El Ghzaoui and published by Springer Nature. This book was released on with total page 667 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Decoding Wireless Communications written by Attaphongse Taparugssanagorn and published by Cambridge Scholars Publishing. This book was released on 2024-06-21 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt: Step into the captivating context of wireless technology with “Decoding Wireless Communications: Bridging Technology and Everyday Life.” Even if you are new to telecommunication engineering, this book makes the journey accessible and engaging. Through relatable analogies and insightful explanations, complex concepts become clear and relatable. Picture wireless networks as bustling cafes, and diversity techniques as the harmonious interplay of musicians in a band. Each chapter unfolds seamlessly, from combating interference with equalizers to navigating the multitasking marvels of Multiple-Input Multiple-Output Orthogonal Frequency Division Multiplexing (MIMO-OFDM). Explore the boundaries of wireless capacity and glimpse the future of 5G, Artificial Intelligence (AI), and the Internet of Things (IoT). Whether you are a curious beginner or a seasoned professional, this book promises an enlightening journey. With its blend of practical insights and thought-provoking reflections, “Decoding Wireless Communications” is your indispensable guide to thriving in our interconnected world. Prepare to be inspired and equipped with the knowledge to decode the intricacies of wireless technology. Grab your copy now and set forth on a journey of discovery that seamlessly intertwines technology with the fabric of everyday life.

Download or read book Smart Nanotextiles written by Nazire Deniz Yilmaz and published by John Wiley & Sons. This book was released on 2022-08-02 with total page 468 pages. Available in PDF, EPUB and Kindle. Book excerpt: Smart Nanotextiles Wearable and Technical Applications This groundbreaking book comprehensively reviews the utilization of smart nanotextiles in various application areas by referring to requirements specific to various application fields, sharing the findings of some of the latest research efforts and state-of-art smart nanotextiles technologies, as well as providing insights relating to challenges and opportunities facing current and future smart nanotextiles. This book covers the emerging and exciting field of nanotextiles and their many applications. Smart nanotextiles form a novel group of materials that are utilized/can be utilized in an array of application areas, such as biomedicine (health monitoring, controlled drug release; wound care, and regenerative medicine), communication, sports, fashion, energy harvesting, protection, filtration, civil and geotechnical engineering, transportation, and so on, including wearable and technical fields. Whereas textiles provide a convenient platform for smart functionality, nanotechnology assures that the favorable characteristics of the textile structure are not impaired by the smart functioning components. Furthermore, based on the superior characteristics of nanostructured components in comparison to macromaterials and micromaterials, nanomaterials provide augmented smart functionality. However, despite the immense research efforts that have been devoted to smart nanotextiles, most of them have not yet transcended the commercialization stage due to high cost, difficulty in large-scale production, low reliability, and potential detrimental effects of nanomaterials on human health and the environment. The 12 chapters comprising this book are all written by subject-matter experts from around the world and discuss the next-generation products along with their challenges and opportunities. Audience Researchers, technologists, industrial engineers, and postgraduate students in the fields of textiles, intelligent materials, electronics, sensors, actuators, biomedicine, fashion, filtration, transportation, civil engineering, environmental engineering, communication, sports performance, and materials science, who have an interest in smart materials, nanotechnology and wearables.

Download or read book Quality Reliability Security and Robustness in Heterogeneous Networks written by Xi Zhang and published by Springer. This book was released on 2012-04-23 with total page 650 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book constitutes the thoroughly refereed post-conference proceedings of the 7th International Conference on Heterogeneous Networking for Quality, Reliability, Security and Robustness, QShine 2010. The 37 revised full papers presented along with 7 papers from the allocated Dedicated Short Range Communications Workshop, DSRC 2010, were carefully selected from numerous submissions. Conference papers are organized into 9 technical sessions, covering the topics of cognitive radio networks, security, resource allocation, wireless protocols and algorithms, advanced networking systems, sensor networks, scheduling and optimization, routing protocols, multimedia and stream processing. Workshop papers are organized into two sessions: DSRC networks and DSRC security.

Download or read book ICT Analysis and Applications written by Simon Fong and published by Springer Nature. This book was released on 2024-01-22 with total page 623 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book proposes new technologies and discusses future solutions for ICT design infrastructures, as reflected in high-quality papers presented at the 8th International Conference on ICT for Sustainable Development (ICT4SD 2023), held in Goa, India, on August 3–4, 2023. The book covers the topics such as big data and data mining, data fusion, IoT programming toolkits and frameworks, green communication systems and network, use of ICT in smart cities, sensor networks and embedded system, network and information security, wireless and optical networks, security, trust, and privacy, routing and control protocols, cognitive radio and networks, and natural language processing. Bringing together experts from different countries, the book explores a range of central issues from an international perspective.

Download or read book International Conference on Communication Computing and Electronics Systems written by V. Bindhu and published by Springer Nature. This book was released on 2020-03-04 with total page 742 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book includes high impact papers presented at the International Conference on Communication, Computing and Electronics Systems 2019, held at the PPG Institute of Technology, Coimbatore, India, on 15-16 November, 2019. Discussing recent trends in cloud computing, mobile computing, and advancements of electronics systems, the book covers topics such as automation, VLSI, embedded systems, integrated device technology, satellite communication, optical communication, RF communication, microwave engineering, artificial intelligence, deep learning, pattern recognition, Internet of Things, precision models, bioinformatics, and healthcare informatics.

Download or read book Ethical and Secure Computing written by Joseph Migga Kizza and published by Springer. This book was released on 2019-01-01 with total page 285 pages. Available in PDF, EPUB and Kindle. Book excerpt: This engaging textbook highlights the essential need for a strong ethical framework in our approach to computer, information and engineering science. Through thought-provoking questions and case studies, the reader is challenged to consider the deeper implications arising from the use of today’s rapidly-evolving computing technologies and ever-changing communication ecosystems. This updated second edition features new material on information security, intellectual property rights, the Internet of Things, and 5G technologies. Topics and features: introduces a philosophical framework and tools for understanding and analyzing computer ethics in personal, public, and professional spheres; describes the impact of computer technology on issues of security, privacy, anonymity, and civil liberties; examines intellectual property rights in the context of computing, including the risks and liabilities associated with software; discusses such key social issues in computing as the digital divide, employee monitoring in the workplace, and risks to physical and mental health; reviews the history of computer crime, and the threat of digitally facilitated bullying, harassment, and discrimination; considers the ethical challenges arising from online social networks, mobile telecommunications, virtual reality, the Internet of Things, and 5G technologies; includes learning objectives, discussion questions and exercises throughout the book. This concise and accessible work addresses the critical ethical and moral issues important to all designers and users of computer technologies. The text incorporates the latest curricula requirements for undergraduate courses in computer science, and offers invaluable insights into the social impact and legal challenges posed by the latest generation of computing devices and networks.

Download or read book Department of Defense appropriations for 1988 written by United States. Congress. House. Committee on Appropriations. Subcommittee on Department of Defense and published by . This book was released on 1987 with total page 1038 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book THE EACH PROJECT Cultural Heritage Second Report January 2011 written by and published by Angelo Ferrari. This book was released on with total page 177 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Green Communication Technologies for Future Networks written by Gurjit Kaur and published by CRC Press. This book was released on 2022-10-31 with total page 301 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores all the energy-efficient communication technologies used for various communication systems and every aspect of these systems, such as green electronics, network protocols, handover, codes, antenna, and the role of artificial intelligence and IoT, including the energy management strategies. It identifies the development of sustainable plans and programs at the communication level within the current legislative framework. Features: Gives a fundamental description of the green communications including granularities of green wired and wireless systems. Describes a comprehensive review of innovations, challenges, and opportunities for green communication. Provides guiding principles on how to build the green communication network. Includes a holistic view of both wireless and wired green communication systems with an emphasis on applications and challenges in each area. Suggests various ways of benchmarking and measuring the performance of green communication systems. This book will be of great interest to graduate students and researchers in green technologies, communications, wireless communication, optical communication, underwater communication, microwave and satellite communication, networking, the internet of things, and energy management.

Download or read book Smart Systems written by Glauco Fontgalland and published by Amplla Editora. This book was released on 2022-09-11 with total page 256 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book aims to highlight the strength and state-of-art of some techniques and methods applied to intelligent systems. Rather to cover the variety of techniques and methods available in the literature, which is out of scope of this book, it focuses on those consolidated and applied and on those with high potential of implementation to smart systems. This book has fourteen chapters covering abroad range of topics in communications. The first three chapters are devoted to state-of-art and review papers on planar filters, unmanned aerial vehicles (UAV), negative group delay, nanoclusters, and tunable lights, while the remain chapters cover specific topics such as smart monitoring, V2I, high-speed links, RF and Optical sensors, composite material, metamaterial, energy harvesting, radar, SWIPT, and electromagnetic sources.

Download or read book Millimeter Wave Sub Terahertz Ultra Massive MIMO Transmission Technology written by Zhen Gao and published by Springer Nature. This book was released on 2023-07-25 with total page 193 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book focuses on the advanced mmWave/Sub-terahertz ultra-massive MIMO wireless communications, which are regarded as a promising paradigm shift in future 5G beyond and even 6G. This is achieved by providing a comprehensive review of the rapidly developing field of massive MIMO communication, in-depth discussions on the impact of extremely large-scale antenna array, and detailed numerical simulation results on our proposed schemes. Several case studies are given after introducing basic communication system components, and the simulation codes are open sourced in our book, which shows the reproducibility of our models and methods and provides convenience for readers such as researchers, engineers, and graduate students in the fields of wireless communications.