Development Of Field Propagation Model For Urban Area

Author : Purnima K Sharma,Dinesh Sharma,R.K. Singh
Publisher : Anchor Academic Publishing
Page : 237 pages
File Size : 45,6 Mb
Release : 2017-04
Category : Technology & Engineering
ISBN : 9783960671268

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Development of Field Propagation Model for Urban Area by Purnima K Sharma,Dinesh Sharma,R.K. Singh Pdf

Wireless communication is one of the most dynamic and vibrant areas of technology development in the communication field today. It has been found that severe climatic conditions disturb the propagation of electromagnetic signals at higher frequencies (greater than 30 MHz). The disturbance is mainly due to molecular absorption by oxygen for frequencies ranging between 60 and 118 GHz and due to water vapour in 22, 183 and 325 GHz bands. Rain and fog has the most significant impact, since the size of the rain drops is of the order of the wavelength of the transmitted signal. This results in energy absorption by the rain drops themselves, and as a secondary effect energy is scattered by the drops. The frequency selective absorption characteristics of the atmosphere can be approximated by a transfer function. In most of the practical channels when the signal propagates through the atmosphere the effect of many factors on the signal has to be considered along with the free space propagation channel assumption. The main objective of this study is, therefore, to find out whether, and how, the different climatic conditions are influencing radio wave propagation in GSM frequency bands in general and in Narnaul, Haryana (India) in particular. To carry out this investigation, the records of radio wave propagation along with path loss during different climatic conditions have been analyzed. On the strength of these analyses, a propagation path loss model has been developed by proposing suitable correction factors due to different climatic conditions. The validation of this developed path loss model has been verified by taking reference models and by applying practically in different urban areas. The effect of these climatic conditions on the link budget has also been analyzed.

Author : Anonim
Publisher : Allied Publishers
Page : 514 pages
File Size : 51,5 Mb
Release : 1998
Category : Electromagnetic waves
ISBN : 8170237866

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National Symposium on Advances in Microwaves and Lightwaves by Anonim Pdf

Author : Mark J. Nieuwenhuijsen
Publisher : Oxford University Press
Page : 352 pages
File Size : 55,5 Mb
Release : 2015-07-08
Category : Medical
ISBN : 9780199378791

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Exposure Assessment in Environmental Epidemiology by Mark J. Nieuwenhuijsen Pdf

This completely updated edition of Exposure Assessment in Environmental Epidemiology offers a practical introduction to exposure assessment methodologies in environmental epidemiologic studies. In addition to methods for traditional methods -- questionnaires, biomonitoring -- this new edition is expanded to include geographic information systems, modeling, personal sensoring, remote sensing, and OMICs technologies. In addition, each of these methods is contextualized within a recent epidemiology study, maximizing illustration for students and those new to these to these techniques. With clear writing and extensive illustration, this book will be useful to anyone interested in exposure assessment, regardless of background.

Author : Anonim
Publisher : Unknown
Page : 136 pages
File Size : 42,9 Mb
Release : 1989
Category : Electronic
ISBN : NASA:31769000659980

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Earth Resources: A Continuing Bibliography with Indexes (issue 63) by Anonim Pdf

Author : Wojciech Zamojski,Jacek Mazurkiewicz,Jarosław Sugier,Tomasz Walkowiak,Janusz Kacprzyk
Publisher : Springer
Page : 528 pages
File Size : 55,7 Mb
Release : 2014-05-16
Category : Technology & Engineering
ISBN : 9783319070131

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Proceedings of the Ninth International Conference on Dependability and Complex Systems DepCoS-RELCOMEX. June 30 – July 4, 2014, Brunów, Poland by Wojciech Zamojski,Jacek Mazurkiewicz,Jarosław Sugier,Tomasz Walkowiak,Janusz Kacprzyk Pdf

DepCoS – RELCOMEX is an annual series of conferences organized by Wrocław University of Technology to promote a comprehensive approach to evaluation of system performability which is now commonly called dependability. In contrast to classic analyses which were concentrated on reliability of technical resources and structures built from them, dependability is based on multi-disciplinary approach to theory, technology and maintenance of a system considered to be a multifaceted amalgamation of technical, information, organization, software and human (users, administrators, supervisors, etc.) resources. Diversity of processes being realized (data processing, system management, system monitoring, etc.), their concurrency and their reliance on in-system intelligence often severely impedes construction of strict mathematical models and calls for application of intelligent and soft computing methods. This book presents the proceedings of the Ninth International Conference on Dependability and Complex Systems DepCoS-RELCOMEX, which took place in Brunów Palace, Poland, from 30th June to 4th July, 2014. The articles selected for this volume illustrate the variety of topics that must be included in system dependability analysis: tools, methodologies and standards for modelling, design and simulation of the systems, security and confidentiality in information processing, specific issues of heterogeneous, today often wireless, computer networks or management of transportation networks.

Author : Michael V. Vesnik
Publisher : Walter de Gruyter GmbH & Co KG
Page : 212 pages
File Size : 48,7 Mb
Release : 2015-07-24
Category : Science
ISBN : 9783110311297

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The Method of the Generalised Eikonal by Michael V. Vesnik Pdf

Diffraction theory describes scattering mechanisms for waves of various physical nature, scattered by objects of different shapes and materials. This book proposes new methods to account for the contour shape, edge profile and boundary conditions of three-dimensional scatterers (in particularly, flat polygons and polyhedrals). A standard method to refine the physical optics approximation (PO) is the heuristic method of edge waves (MEW). In comparison with MEW, the presented approaches simplify the solving and refining the PO approximation without solving a corresponding two-dimensional problem. Furthermore these methods allow to take into account the field perturbation in the vicinity of vertices. While the analytical formulas obtained by using these new approaches are as simple as in the PO case, the accuracy can be even higher than for MEW. On the basis of the developed methods construction of solutions for wave propagation in urban area and elastic wave diffraction (including seismic waves) are proposed. The book is useful for specialists who solve scientific and engineering problems in wave propagation and for students and postgraduate students.

Author : Savo G. Glisic,Pentti A. Leppänen
Publisher : Springer Science & Business Media
Page : 535 pages
File Size : 53,7 Mb
Release : 2013-03-14
Category : Technology & Engineering
ISBN : 9781475726046

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Wireless Communications by Savo G. Glisic,Pentti A. Leppänen Pdf

In Time Division Multiple Access (TDMA), within a given time frame a particular user is allowed to transmit within a given time slot. This technique is used in most of the second-generation digital mobile communication systems. In Europe the system is known as GSM, in USA as DAMPS and in Japan as MPT. In Code Division Multiple Access (CDMA) every user is using a distinct code so that it can occupy the same frequency bandwidth at the same time with other users and still can be separated on the basis of low correlation between the codes. These systems like IS-95 in the USA are also developed and standardized within the second generation of the mobile communication systems. CDMA systems within a cellular network can provide higher capacity and for this reason they become more and more attractive. At this moment it seems that both TDMA and CDMA remain viable candidates for application in future systems. Wireless Communications: TDMA versus CDMA provides enough information for correct understanding of the arguments in favour of one or other multiple access technique. The final decision about which of the two techniques should be employed will depend not only on technical arguments but also on the amount of new investments needed and compatibility with previous systems and their infrastructures. Wireless Communications: TDMA versus CDMA comprises a collection of specially written contributions from the most prominent specialists in wireless communications in the world today and presents the major, up to date, issues in this field. The material is grouped into four chapters: Communication theory, covering coding and modulation, Wireless communications, Antenna & Propagation and Advanced Systems & Technology. The book describes clearly the issues and presents the information in such a way that informed decisions about third generation wireless systems can be taken. It is essential reading for all researchers, engineers and managers working in the field of Wireless Communications.

Author : Claude Oestges,Francois Quitin
Publisher : Academic Press
Page : 396 pages
File Size : 41,6 Mb
Release : 2021-05-18
Category : Computers
ISBN : 9780128205822

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Inclusive Radio Communications for 5G and Beyond by Claude Oestges,Francois Quitin Pdf

Inclusive Radio Communication Networks for 5G and Beyond is based on the COST IRACON project that consists of 500 researchers from academia and industry, with 120 institutions from Europe, US and the Far East involved. The book presents state-of-the-art design and analysis methods for 5G (and beyond) radio communication networks, along with key challenges and issues related to the development of 5G networks. Covers the latest research on 5G networks – including propagation, localization, IoT and radio channels Based on the International COST research project, IRACON, with 120 institutions and 500 researchers from Europe, US and the Far East involved Provides coverage of IoT protocols, architectures and applications, along with IoT applications in healthcare Contains a concluding chapter on future trends in mobile communications and networking

Author : Theodore S. Rappaport,Robert W. Heath Jr.,Robert C. Daniels,James N. Murdock
Publisher : Prentice Hall
Page : 705 pages
File Size : 47,7 Mb
Release : 2014-09-09
Category : Computers
ISBN : 9780132173681

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Millimeter Wave Wireless Communications by Theodore S. Rappaport,Robert W. Heath Jr.,Robert C. Daniels,James N. Murdock Pdf

The Definitive, Comprehensive Guide to Cutting-Edge Millimeter Wave Wireless Design “This is a great book on mmWave systems that covers many aspects of the technology targeted for beginners all the way to the advanced users. The authors are some of the most credible scholars I know of who are well respected by the industry. I highly recommend studying this book in detail.” —Ali Sadri, Ph.D., Sr. Director, Intel Corporation, MCG mmWave Standards and Advanced Technologies Millimeter wave (mmWave) is today's breakthrough frontier for emerging wireless mobile cellular networks, wireless local area networks, personal area networks, and vehicular communications. In the near future, mmWave applications, devices, and networks will change our world. In Millimeter Wave Wireless Communications, four of the field's pioneers, including Theodore S. Rappaport, Robert W. Heath, Robert C. Daniels, and James N. Murdock, draw on their vast experience to empower engineers at all levels to succeed with mmWave. They deliver fundamental, end-to-end coverage of all aspects of future mmWave wireless communications systems. The authors explain new multi-Gigabit per second products and applications, mmWave signal propagation, analog and digital circuit design, mmWave antenna designs, and current and emerging wireless standards. They cover comprehensive mmWave wireless design issues for 60 GHz and other mmWave bands, from channel to antenna to receiver, introducing emerging design techniques that will be invaluable for research engineers in both industry and academia. Topics include Digital communication: baseband signal/channel models, modulation, equalization, error control coding, multiple input multiple output (MIMO) principles, and hardware architectures Radio wave propagation characteristics: indoor and outdoor channel models and beam combining Antennas/antenna arrays, including on-chip and in-package antennas, fabrication, and packaging Analog circuit design: mmWave transistors, fabrication, and transceiver design approaches Baseband circuit design: multi–gigabit-per-second, high-fidelity DAC and ADC converters Physical layer: algorithmic choices, design considerations, and impairment solutions; and how to overcome clipping, quantization, and nonlinearity Higher-layer design: beam adaptation protocols, relaying, multimedia transmission, and multiband considerations 60 GHz standardization: IEEE 802.15.3c for WPAN, Wireless HD, ECMA-387, IEEE 802.11ad, Wireless Gigabit Alliance (WiGig)

Author : Anonim
Publisher : Unknown
Page : 776 pages
File Size : 46,6 Mb
Release : 1979
Category : Water
ISBN : PSU:000068688493

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Selected Water Resources Abstracts by Anonim Pdf

Author : British Dam Society. Conference
Publisher : Thomas Telford
Page : 640 pages
File Size : 55,9 Mb
Release : 2002
Category : Dam safety
ISBN : 0727731394

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Reservoirs in a Changing World by British Dam Society. Conference Pdf

This volume is the Proceedings from the 12th International Conference organised by the British Dam Society in September 2002.Reservoir safety is the key theme with many papers on the performance and rehabilitation of dams. The evolution of reservoirs in Ireland and the development of safety legislation in the UK are described. Risk assessment features in a number of papers as a method of assessing the safety of reservoirs. Several papers address the seismic assessment of dams and structures.

Author : Anonim
Publisher : Unknown
Page : 622 pages
File Size : 42,9 Mb
Release : 1985
Category : Urban transportation
ISBN : UCLA:L0055063929

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Urban Transportation Abstracts by Anonim Pdf

Author : Management Association, Information Resources
Publisher : IGI Global
Page : 2281 pages
File Size : 52,8 Mb
Release : 2012-09-30
Category : Technology & Engineering
ISBN : 9781466620391

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Geographic Information Systems: Concepts, Methodologies, Tools, and Applications by Management Association, Information Resources Pdf

Developments in technologies have evolved in a much wider use of technology throughout science, government, and business; resulting in the expansion of geographic information systems. GIS is the academic study and practice of presenting geographical data through a system designed to capture, store, analyze, and manage geographic information. Geographic Information Systems: Concepts, Methodologies, Tools, and Applications is a collection of knowledge on the latest advancements and research of geographic information systems. This book aims to be useful for academics and practitioners involved in geographical data.

Author : Bastien Chopard,Marco Tomassini
Publisher : Springer
Page : 370 pages
File Size : 42,9 Mb
Release : 2003-06-30
Category : Computers
ISBN : 9783540458302

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Cellular Automata by Bastien Chopard,Marco Tomassini Pdf

This volume contains the proceedings of the Fifth International Conference on Cellular Automata for Research and Industry (ACRI 2002) that was held in - neva on October 9–11, 2002. After more modest beginnings in 1994 as a largely Italian conference, over the years ACRI has gradually become ?rmly established as one of the premier conferences in the ?eld of cellular automata in Europe and beyond. Althoughthe?eldofcellularautomataisarelativelyoldandestablishedone, these simple but powerful systems and their newer variations continue to attract the interest of researchers after more than half a century since the seminal work of Ulam and Von Neumann. The ACRI series of conferences has the ambition of being an internationally renowned forum for all those interested in the theory and applications of cellular systems. The contributions collected in this volume concern cellular automata in - rious?eldssuchastheory,implementationsandapplications.Inaddition,several ?eldsofresearch(e.g.themulti-agentsapproach)adoptmethodologiesthatshow strict a?nities to cellular automata, but without the label “Cellular Automata”. Therefore, one of our intentions was to enlarge the cellular automata community to include new related techniques.

Author : Anonim
Publisher : Unknown
Page : 440 pages
File Size : 47,6 Mb
Release : 1995
Category : Aeronautics
ISBN : MINN:30000006324267

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Scientific and Technical Aerospace Reports by Anonim Pdf