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1كتاب إلكتروني
الوصف: This book introduces the various approaches and tools used for modelling different propagation environments and lays the foundation for developing a unified theoretical framework for future integrated communication networks. In the case of each type of network, the book uses basic concepts of physics, mathematics, geometry and probability theory to study the impact of the dimension and shape of the propagation environment and relative transmit-receive position on the information flow. The book provides an introduction into wireless communication systems and networks and their applications. For both systems and networks, the basic hard (encoder, modulator, etc.) and soft components (information, signal, etc.) are discussed through schematic block diagrams. Next each of the modes of communication, namely radio waves, acoustic waves, magnetic induction, optical waves, biological particles (molecules, aerosols, neural synapse etc.) and quantum field, are discussed. For each communication scenario presented, the impact of different environmental factors on the propagation phenomenon is articulated, followed by different channel modelling (deterministic, analytical, and stochastic) techniques that are used to characterize the propagation environment. Finally future trends in wireless communication networks are examined and envisioned for next generations 6G/7G of communication systems, like space information networks, sea-to-sky internet of vehicles, and internet of bio-nano things. Based on the future trends of integrated networks, the book drives the need for a generalized channel model irrespective of the media and mode of information transfer. The primary audience for the book is post-graduate students, researchers and academics in electronics and communications engineering, electrical engineering and computer science.
المؤلفون: Indrakshi Dey
نوع المادة: eBook.
تصنيفات: TECHNOLOGY & ENGINEERING / Electrical, TECHNOLOGY & ENGINEERING / Microwaves, TECHNOLOGY & ENGINEERING / Mobile & Wireless Communications
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2كتاب إلكتروني
الوصف: Elastic waves are used in fields as diverse as the non-destructive evaluation of materials, medicine, seismology and telecommunications. Elastic Waves in Solids 1 presents the different modes of propagation of elastic waves in increasingly complex media and structures. It first studies the propagation in an unlimited solid where only the material properties are taken into account. It then analyzes reflection and transmission phenomena at an interface with a fluid or a second solid.It explains the search for propagation modes on a free surface or at the interface between two media. Finally, it proposes a study of the dispersive propagation of elastic waves guided by a plate or a cylinder. This book is intended for students completing a master's degree in acoustics, mechanics, geophysics or engineering, as well as teachers and researchers in these disciplines.
المؤلفون: Daniel Royer, Tony Valier-Brasier
نوع المادة: eBook.
الموضوعات: Elastic wave propagation
تصنيفات: SCIENCE / Mechanics / Solids
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3كتاب إلكتروني
الوصف: This book presents a practical design method for cellular systems, focusing on antenna design and propagation in different scenarios, with particular emphasis on base station (BS) and mobile terminals. Written by an expert in antenna measurement for mobile systems, the book fully details the fundamentals of and design considerations for both antennas and propagation, which is not commonly found together in one resource. The book helps you understand the practical design procedures of mobile communication antenna systems based on the propagation estimation by measurements and simulation. You will learn all the required knowledge and background for the research and development of current and future systems, and a host of other essential considerations and conditions pertaining to antenna and propagation. This is an excellent book for engineers working for cellar system operators, engineers working for manufacturing companies of smart phones and base station systems, and graduate students majoring antennas and propagation.
المؤلفون: Arai, Hiroyuki
نوع المادة: eBook.
الموضوعات: Cell phone systems--Antennas, Radio wave propagation
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4كتاب إلكتروني
الوصف: This book offers comprehensive, practical guidance on RF propagation channel characterization at mmWave and sub-terahertz frequencies, with an overview of both measurement systems and current and future channel models. It introduces the key concepts required for performing accurate mmWave channel measurements, including channel sounder architectures, calibration methods, channel sounder performance metrics and their relationship to propagation channel characteristics. With a comprehensive introduction to mmWave channel models, the book allows readers to carefully review and select the most appropriate channel model for their application. The book provides fundamental system theory accessible in a step by step way with clear examples throughout. With inter- and multidisciplinary perspectives, the reader will observe the tight interaction between measurements and modeling for these frequency bands and how different disciplines interact. This is an excellent reference for researchers, including graduate students, working on mmWave and sub-THz wireless communications, and for engineers developing communication systems.
نوع المادة: eBook.
الموضوعات: Radio frequency allocation, Radio wave propagation--Measurement, Submillimeter waves--Mathematical models
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5كتاب إلكتروني
الوصف: Elastic Wave Propagation in Structures and Materials initiates with a brief introduction to wave propagation, different wave equations, integral transforms including fundamentals of Fourier Transform, Wavelet Transform, Laplace Transform and their numerical implementation. Concept of spectral analysis and procedure to compute the wave parameters, wave propagation in 1-D isotropic waveguides, wave dispersion in 2-D waveguides is explained. Wave propagation in different media such as laminated composites, functionally graded structures, granular soils including non-local elasticity models is addressed. The entire book is written in modular form and analysis is performed in frequency domain.Features: Brings out idea of wave dispersion and its utility in the dynamic responses. Introduces concepts as Negative Group Speeds, Einstein's Causality and escape frequencies using solid mathematical framework. Discusses the propagation of waves in materials such as laminated composites and functionally graded materials. Proposes spectral finite element as analysis tool for wave propagation. Each concept/chapter supported by homework problems and MATLAB/FORTRAN codes. This book aims at Senior Undergraduates and Advanced Graduates in all streams of engineering especially Mechanical and Aerospace Engineering.
المؤلفون: Srinivasan Gopalakrishnan
نوع المادة: eBook.
الموضوعات: Elastic wave propagation
تصنيفات: SCIENCE / Mechanics / General, TECHNOLOGY & ENGINEERING / Mechanical, TECHNOLOGY & ENGINEERING / Materials Science / General
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6كتاب إلكتروني
الوصف: This textbook provides a solid foundation into many approaches that are used in the analysis of advanced electromagnetic wave propagation problems. The techniques discussed are essential to obtain closed-form solutions or asymptotic solutions and meet an existing need for instructors and students in electromagnetic theory. The book covers various advanced mathematical methods used in the evaluation of the electromagnetic fields in rectangular, cylindrical and spherical geometries. The mathematics of special functions (i.e., Bessel, Hankel, Airy, Legendre, Error, etc.) are covered in depth, including appropriate Appendices. The author takes particular care to provide detailed explanations of auxiliary potentials, Hertz's vectors, Debye potentials, as well as the use of Green functions, the Watson transformation and the method of steepest descent in the solution of electromagnetic problems. Overall, Advanced Electromagnetic Wave Propagation Methods is a good source for the many skills required in obtaining closed form and asymptotic solution, which in many instances cannot be obtained using computer codes of Maxwell's equations. Thus, it provides an excellent training for preparing graduate students in their research work. This book is intended for a graduate course in electromagnetic theory for students in electrical engineering. Students in physics and professionals will also find it appropriate and useful. Provides a comprehensive and unified treatment of radiation and propagation problems Presents a detailed explanation in the use of Green functions, the Watson transformation and the method of steepest descent as they apply to electromagnetic problems Demonstrates various advanced mathematical techniques used in the evaluation of the electromagnetic fields Details how to formulate and obtain a closed-form solution or an asymptotic solution Includes appendices for Bessel, Legendre, Airy and Error functions
المؤلفون: Guillermo Gonzalez
نوع المادة: eBook.
تصنيفات: MATHEMATICS / Applied, TECHNOLOGY & ENGINEERING / Electrical, TECHNOLOGY & ENGINEERING / Microwaves, TECHNOLOGY & ENGINEERING / Mobile & Wireless Communications
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7كتاب إلكتروني
الوصف: This practical text gives engineers and technicians at all levels an easy-to-follow entry point into the subject of RF/EM wave propagation and antennas. While aimed primarily at those who are entering the field or transitioning from a related field, the book also helps experienced professionals obtain a more refined understanding of the various methodologies and processes in this area. The book covers the essentials, practices, technical details, and considerations needed to help a team of engineers design, install, and/or predict the technical performance of a new (or even existing) one-way, two-antenna (long radiating distance) RF communication system. The chapters are organized logically to walk you step by step through the application processes, showing you proven methods to bring about top performance, while also helping you factor in unanticipated variances, including those caused by the earth itself, earth's gaseous atmosphere, rain, snow, hail, ice, ionospheric signal attenuation, and EM waves. This kind of understanding and consideration saves time, money, and much frustration in a project. With this book in hand, you will better understand RF/EM wave propagation and the technical vernacular used to describe it; become familiar with the various processes and considerations in analyzing, designing, and predicting the performance of new and existing antenna RF communications systems; and more confidently approach problem solving and possible solutions for reducing signal interference and loss. The chapter contents, while not sparing the reader exposure to radiated RF system design and analysis terminology, are written in a relaxed, conversational tone and easy-to-understand manner, making this a perfect learning tool for those entering or transitioning to this field, as well as an excellent supplement or foundational text for an instructional course. The book's logically organized and easy-to-access chapter structure also facilitates its use as a bench reference for quick lookup or review.
المؤلفون: Friesen, Dean James
نوع المادة: eBook.
الموضوعات: Radio wave propagation, Antennas (Electronics)
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8كتاب إلكتروني
الوصف: Transforming the way we live, work, and engage with our environment, 5G and beyond technologies will provide much higher bandwidth and connectivity to billions of devices. This brings enormous opportunities but of course the widespread deployment of these technologies faces challenges, including the need for reliable connectivity, a diverse range of bandwidths, dynamic spectrum sharing, channel modelling and wave propagation for ultra-dense wireless networks, as well as price pressures. The choice of an antenna system will also be a critical component of all node end devices and will present several design challenges such as size, purpose, shape and placement. In this edited book, the authors bring new approaches for exploiting challenging propagation channels and the development of efficient, cost-effective, scalable, and reliable antenna systems and solutions, as well as future perspectives.
نوع المادة: eBook.
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9كتاب إلكتروني
الوصف: The book provides a comprehensive presentation of the topic of phononic and sonic crystals, including acoustic and elastic wave propagation in homogeneous and periodic media, Bloch waves and band structures, surface phononic crystals and phononic crystal slabs, evanescent Bloch waves and complex band structures, local resonance, dispersion and negative refraction, and phononic band gap guidance. The book is accompanied with a comprehensive set of finite element model (FEM) scripts for solving basic phononic crystal problems, as supplementary material. The scripts should allow the reader to generate band structures for 2D and 3D phononic crystals, to compute Bloch waves, waveguide and cavity modes, and more. They can be accessed here: https://members.femto-st.fr/vincent-laude/freefem-scripts-numerical-simulation-phononic-crystalsTest
المؤلفون: Vincent Laude
نوع المادة: eBook.
الموضوعات: Acoustic paramagnetic resonance, Elastic wave propagation, Metamaterials, Acoustical materials
تصنيفات: SCIENCE / Physics / Optics & Light, SCIENCE / Applied Sciences, SCIENCE / Physics / General, SCIENCE / Waves & Wave Mechanics
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10كتاب إلكتروني
الوصف: Providing a unified treatment of radio wave propagation in vehicular environments, this book offers a thorough discussion of their theoretical background and fundamental limits, and paves the way to a better understanding of more advanced topics. Further, the book introduces the newest challenges and problems posed by the ever growing need to communicate in mobile networks whilst in a vehicle.
المؤلفون: Leyre Azpilicueta, Cesar Vargas-Rosales, Francisco Falcone, Ana Alejos
نوع المادة: eBook.
الموضوعات: Intelligent transportation systems, Automotive telematics, Radio wave propagation, Mobile communication systems
