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Author: Donald L. Hall Publisher: ISBN: Category : Languages : en Pages :
Book Description
The ability to localize wireless transmitters in indoor environments is gaining increased interest for commercial and military applications. Conducting indoor localization with precision is an ever-growing need as the conventional Global Positioning System (GPS) is hampered in its ability to provide high resolution location information due to complex multipath scattering within buildings. Conventional localization schemes such as Direction of Arrival (DOA) estimation often fall victim to the same constraints of GPS by means of ambiguous scattering caused by indoor environments leading to inaccurate DOA estimates. Improvements in indoor localization systems can inevitably enhance commercial marketing strategies, military search and rescue missions, wireless security in defense facilities, and even household security for intrusion detection. This dissertation has two primary thrusts. The first thrust addresses the exploitation of polarization diversity for optimal indoor localization performance. A system is developed to extract unique three-dimensional (3D) wireless channel characteristics by combining electromagnetic principles, signal processing techniques, and machine learning for indoor localization. Localization algorithms are developed to demonstrate localization robustness to transmitter polarization and the uniqueness of 3D spatial scattering. The second thrust addresses the degradation on DOA approaches by developing a DOA-based approach to localizing emitters in an indoor environment via machine learning. The approach utilizes spatial correlations between emitters in close-proximity in order to achieve robust localization performance. A theoretical derivation of the ratio of multipath scattering is then developed to improve localization characteristics for DOA-based and other localization solutions.
Author: Donald L. Hall Publisher: ISBN: Category : Languages : en Pages :
Book Description
The ability to localize wireless transmitters in indoor environments is gaining increased interest for commercial and military applications. Conducting indoor localization with precision is an ever-growing need as the conventional Global Positioning System (GPS) is hampered in its ability to provide high resolution location information due to complex multipath scattering within buildings. Conventional localization schemes such as Direction of Arrival (DOA) estimation often fall victim to the same constraints of GPS by means of ambiguous scattering caused by indoor environments leading to inaccurate DOA estimates. Improvements in indoor localization systems can inevitably enhance commercial marketing strategies, military search and rescue missions, wireless security in defense facilities, and even household security for intrusion detection. This dissertation has two primary thrusts. The first thrust addresses the exploitation of polarization diversity for optimal indoor localization performance. A system is developed to extract unique three-dimensional (3D) wireless channel characteristics by combining electromagnetic principles, signal processing techniques, and machine learning for indoor localization. Localization algorithms are developed to demonstrate localization robustness to transmitter polarization and the uniqueness of 3D spatial scattering. The second thrust addresses the degradation on DOA approaches by developing a DOA-based approach to localizing emitters in an indoor environment via machine learning. The approach utilizes spatial correlations between emitters in close-proximity in order to achieve robust localization performance. A theoretical derivation of the ratio of multipath scattering is then developed to improve localization characteristics for DOA-based and other localization solutions.
Author: Publisher: ISBN: Category : Languages : en Pages : 88
Book Description
The Bulletin of the Atomic Scientists is the premier public resource on scientific and technological developments that impact global security. Founded by Manhattan Project Scientists, the Bulletin's iconic "Doomsday Clock" stimulates solutions for a safer world.
Author: Bharat S Chaudhari Publisher: Academic Press ISBN: 0128188812 Category : Technology & Engineering Languages : en Pages : 448
Book Description
Low power wide area network (LPWAN) is a promising solution for long range and low power Internet of Things (IoT) and machine to machine (M2M) communication applications. The LPWANs are resource-constrained networks and have critical requirements for long battery life, extended coverage, high scalability, and low device and deployment costs. There are several design and deployment challenges such as media access control, spectrum management, link optimization and adaptability, energy harvesting, duty cycle restrictions, coexistence and interference, interoperability and heterogeneity, security and privacy, and others.LPWAN Technologies for IoT and M2M Applications is intended to provide a one-stop solution for study of LPWAN technologies as it covers a broad range of topics and multidisciplinary aspects of LPWAN and IoT. Primarily, the book focuses on design requirements and constraints, channel access, spectrum management, coexistence and interference issues, energy efficiency, technology candidates, use cases of different applications in smart city, healthcare, and transportation systems, security issues, hardware/software platforms, challenges, and future directions. - One stop guide to the technical details of various low power long range technologies such as LoRaWAN, Sigfox, NB-IoT, LTE-M and others - Describes the design aspects, network architectures, security issues and challenges - Discusses the performance, interference, coexistence issues and energy optimization techniques - Includes LPWAN based intelligent applications in diverse areas such as smart city, traffic management, health and others - Presents the different hardware and software platforms for LPWANs - Provides guidance on selecting the right technology for an application
Author: David Tse Publisher: Cambridge University Press ISBN: 9780521845274 Category : Computers Languages : en Pages : 598
Book Description
This textbook takes a unified view of the fundamentals of wireless communication and explains cutting-edge concepts in a simple and intuitive way. An abundant supply of exercises make it ideal for graduate courses in electrical and computer engineering and it will also be of great interest to practising engineers.
Author: Erik G. Larsson Publisher: Cambridge University Press ISBN: 9780521065337 Category : Technology & Engineering Languages : en Pages : 304
Book Description
Space-time coding is a technique that promises greatly improved performance in wireless networks by using multiple antennas at the transmitter and receiver. Space-Time Block Coding for Wireless Communications is an introduction to the theory of this technology. The authors develop the topic using a unified framework and cover a variety of topics ranging from information theory to performance analysis and state-of-the-art space-time coding methods for both flat and frequency-selective fading multiple-antenna channels. The authors concentrate on key principles rather than specific practical applications, and present the material in a concise and accessible manner. Their treatment reviews the fundamental aspects of multiple-input, multiple output communication theory, and guides the reader through a number of topics at the forefront of current research and development. The book includes homework exercises and is aimed at graduate students and researchers working on wireless communications, as well as practitioners in the wireless industry.
Author: Hamid Jafarkhani Publisher: Cambridge University Press ISBN: 9780521842914 Category : Science Languages : en Pages : 328
Book Description
This book covers the fundamental principles of space-time coding for wireless communications over multiple-input multiple-output (MIMO) channels, and sets out practical coding methods for achieving the performance improvements predicted by the theory. Starting with background material on wireless communications and the capacity of MIMO channels, the book then reviews design criteria for space-time codes. A detailed treatment of the theory behind space-time block codes then leads on to an in-depth discussion of space-time trellis codes. The book continues with discussion of differential space-time modulation, BLAST and some other space-time processing methods and the final chapter addresses additional topics in space-time coding. The theory and practice sections can be used independently of each other. Written by one of the inventors of space-time block coding, this book is ideal for a graduate student familiar with the basics of digital communications, and for engineers implementing the theory in real systems.
Author: Mohsen Kavehrad Publisher: John Wiley & Sons ISBN: 1118887700 Category : Technology & Engineering Languages : en Pages : 285
Book Description
This book discusses the fundamental aspects of multiple-source Optical Wireless Applications, including Visible Light Communications (VLC). Moreover, the authors explore VLC performance in several conventional household layouts and investigate the impact of these layouts on VLC. Multiple sources increase multipath distortion. Multi-input- Multi-Output (MIMO) techniques will be included as they provide either reliability improvement or bandwidth efficiency increase. Based on these topics, the book further explores VLC performance in real applications, such as aircraft cabin wireless communications. In addition, the authors describe the Lambertian emitting pattern of LEDs and the diffused features in indoor environments. Based on the theory, they trace light pulses to establish a MIMO indoor wireless channel model on specific sources layout. Next, they generate test data to simulate BER distribution in a room and calculate the outage. Furthermore, addresses the performance improvement when MIMO techniques are applied. Lastly, the authors investigate VLC performance in specific applications, including for aircraft on-board wireless communications. Finally, the pitfalls of MIMO systems are discussed.
Author: Donald L. Hall
Author: Donald L. Hall
Author: 
Author: Thushara Abhayapala
Author: Luis Gurrieri
Author: Bharat S Chaudhari
Author: David Tse
Author: Erik G. Larsson
Author: Arogyaswami Paulraj
Author: Hamid Jafarkhani
Author: Mohsen Kavehrad