Multipath Channels In Wireless Infrared Communications Modeling Angle Diversity And Estimation
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Multipath Channels In Wireless Infrared Communications Modeling Angle Diversity And Estimation
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Author : Jeffrey Brian Carruthers
language : en
Publisher:
Release Date : 1997
Multipath Channels In Wireless Infrared Communications Modeling Angle Diversity And Estimation written by Jeffrey Brian Carruthers and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Infrared technology categories.
Indoor Infrared Optical Wireless Communications
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Author : Ke Wang
language : en
Publisher: CRC Press
Release Date : 2019-12-23
Indoor Infrared Optical Wireless Communications written by Ke Wang and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-23 with Technology & Engineering categories.
This book aims to give an overview of recent developments in indoor near-infrared optical wireless communication technologies and systems, including basic theories, operating fundamentals, system architectures, modelling, experimental demonstrations, advanced techniques, and most recently, the research efforts towards integrations. Both line-of-sight and diffusive-signals-based options will be reviewed, to provide readers a complete picture about this rapidly developing area, which targets the provision of high-speed wireless connectivity to end- users in indoor environments, such as offices, homes and shopping centres, to satisfy the growing high-speed communication requirement. Provides a systematic approach for the fundamentals of indoor optical wireless communications. Provides an overview of recent developments in indoor infrared optical wireless communications, including theoretical fundamentals. Examines system architectures, modelling, experimental demonstrations, and the research efforts towards integrations. Dr. Ke Wang is an Australian Research Council (ARC) DECRA Fellow and a senior lecturer in the School of Engineering, Royal Melbourne Institute of Technology (RMIT University), VIC, Australia. He worked with the University of Melbourne, Australia, and Stanford University, California, before joining RMIT University. He has published over 110 peer-reviewed papers in top journals and leading international conferences, including over 20 invited papers. He has been awarded several prestigious national and international awards as recognition of research contributions, such as the Victoria Fellowship, the AIPS Young Tall Poppy Science Award, and the Marconi Society Paul Baran Young Scholar Award. His major areas of interest include: silicon photonics integration, opto-electronics integrated devices and circuits, nanophotonics, optical wireless technology for short-range applications, quasi-passive reconfigurable devices and applications and optical interconnects in data -centres and high-performance computing.
Dissertation Abstracts International
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Author :
language : en
Publisher:
Release Date : 1998
Dissertation Abstracts International written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with Dissertations, Academic categories.
Spatial Modeling Of Three Dimensional Multipath Wireless Channels
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Author : Dimitar Georgiev Valchev
language : en
Publisher:
Release Date : 2008
Spatial Modeling Of Three Dimensional Multipath Wireless Channels written by Dimitar Georgiev Valchev and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008 with Electronic dissertations categories.
The wireless communication channel is charactarized by multipath propagation mechanism due to scattering by objects surrounding the communicating nodes. Unmitigated multipath propagation can be harmful due to the introduced distortion by superimposing multiple signal replicas. On the other hand, the multipath propagation can be beneficial in providing implicit diversity, as the propagation paths can be used as multiple communication channels. This dissertation thesis presents a simple method for spatial modeling of narrowband multipath channels. It presents results that have stemmed from a new approach in channel characterization - deriving the second-order fading statistics like level-crossing rate, average fade duration, and coherence distance and time from the multipath angular power distribution (APD) at the receiver antenna. First, a new method is presented for characterizing the three-dimensional angular spread of the received multipath in terms of the zeroth- and first-degree spherical harmonic coefficients of the APD, and the dependence of the average spatial correlation of the received signal envelope on that angular spread is derived. Second, the derivation of the average second-order fading channel statistics in terms of the angular spread is extended for characterizing the angular variability of the second-order fading statistics in a local area and local volume. This characterization is obtained in terms of the so-called three-dimensional multipath shape factors - an extension of an earlier work on horizontal propagation. The multipath shape factors in this work are defined in terms of the zeroth-, first- and second-degree spherical harmonic coefficients of the APD. Third, the shape factor theory has been extended for modeling mobile-to-mobile multipath channels through the joint APD at both wireless link ends. For this purpose, joint multipath shape factors have been defined in terms of the double Fourier coefficients of the joint biazimuthal APD for the two-dimensional model, or the double spherical harmonic coefficients of the joint bispherical APD for the three-dimensional model.
Optical Wireless Communications
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Author : Z. Ghassemlooy
language : en
Publisher: CRC Press
Release Date : 2019-04-30
Optical Wireless Communications written by Z. Ghassemlooy and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-04-30 with Technology & Engineering categories.
The 2nd Edition of Optical Wireless Communications: System and Channel Modelling with MATLAB® with additional new materials, is a self-contained volume that provides a concise and comprehensive coverage of the theory and technology of optical wireless communication systems (OWC). The delivery method makes the book appropriate for students studying at undergraduate and graduate levels as well as researchers and professional engineers working in the field of OWC. The book gives a detailed description of OWC, focusing mainly on the infrared and visible bands, for indoor and outdoor applications. A major attraction of the book is the inclusion of Matlab codes and simulations results as well as experimental test-beds for free space optics and visible light communication systems. This valuable resource will aid the readers in understanding the concept, carrying out extensive analysis, simulations, implementation and evaluation of OWC links. This 2nd edition is structured into nine compact chapters that cover the main aspects of OWC systems: History, current state of the art and challenges Fundamental principles Optical source and detector and noise sources Modulation, equalization, diversity techniques Channel models and system performance analysis Visible light communications Terrestrial free space optics communications Relay-based free space optics communications Matlab codes. A number of Matlab based simulation codes are included in this 2nd edition to assist the readers in mastering the subject and most importantly to encourage them to write their own simulation codes and enhance their knowledge.
Channel Probing For An Indoor Wireless Communications Channel
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Author : Brandon Rosel Hunter
language : en
Publisher:
Release Date : 2003
Channel Probing For An Indoor Wireless Communications Channel written by Brandon Rosel Hunter and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Electronic dissertations categories.
The statistics of the amplitude, time and angle of arrival of multipaths in an indoor environment are all necessary components of multipath models used to simulate the performance of spatial diversity in receive antenna configurations. The model presented by Saleh and Valenzuela, was added to by Spencer et. al., and included all three of these parameters for a 7 GHz channel. A system was built to measure these multipath parameters at 2.4 GHz for multiple locations in an indoor environment. Another system was built to measure the angle of transmission for a 6 GHz channel. The addition of this parameter allows spatial diversity at the transmitter along with the receiver to be simulated. The process of going from raw measurement data to discrete arrivals and then to clustered arrivals is analyzed. Many possible errors associated with discrete arrival processing are discussed along with possible solutions. Four clustering methods are compared and their relative strengths and weaknesses are pointed out. The effects that errors in the clustering process have on parameter estimation and model performance are also simulated.
Handbook Of Laser Technology And Applications
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Author : Chunlei Guo
language : en
Publisher: CRC Press
Release Date : 2021-06-23
Handbook Of Laser Technology And Applications written by Chunlei Guo and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2021-06-23 with Technology & Engineering categories.
This comprehensive handbook gives a fully updated guide to lasers and laser technologies, including the complete range of their technical applications. This forth volume covers laser applications in the medical, metrology and communications fields. Key Features: • Offers a complete update of the original, bestselling work, including many brand-new chapters. • Deepens the introduction to fundamentals, from laser design and fabrication to host matrices for solid-state lasers, energy level diagrams, hosting materials, dopant energy levels, and lasers based on nonlinear effects. • Covers new laser types, including quantum cascade lasers, silicon-based lasers, titanium sapphire lasers, terahertz lasers, bismuth-doped fiber lasers, and diode-pumped alkali lasers. • Discusses the latest applications, e.g., lasers in microscopy, high-speed imaging, attosecond metrology, 3D printing, optical atomic clocks, time-resolved spectroscopy, polarization and profile measurements, pulse measurements, and laser-induced fluorescence detection. • Adds new sections on laser materials processing, laser spectroscopy, lasers in imaging, lasers in environmental sciences, and lasers in communications. This handbook is the ideal companion for scientists, engineers, and students working with lasers, including those in optics, electrical engineering, physics, chemistry, biomedicine, and other relevant areas.
Joint Channel And Frequency Offset Estimation For Wireless Communications
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Author :
language : en
Publisher:
Release Date : 2011
Joint Channel And Frequency Offset Estimation For Wireless Communications written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
Vlsi Circuits And Systems
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Author :
language : en
Publisher:
Release Date : 2003
Vlsi Circuits And Systems written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2003 with Integrated circuits categories.
Diversity Receiver Design And Channel Statistic Estimation In Fading Channels
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Author : Jinghua Jin
language : en
Publisher:
Release Date : 2006
Diversity Receiver Design And Channel Statistic Estimation In Fading Channels written by Jinghua Jin and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.
The main goal of this thesis is to provide an in-depth study of two important techniques that are effective in improving the performance, data rate, or bandwidth-efficiency in wireless communication systems. The two techniques are, first, diversity combining equipped with quadrature amplitude modulation (QAM), and second, the estimation of fading channel statistical properties. To effectively combat the adverse effect of fading and to improve the error rate performance in wireless communications, one of the major approaches is to employ diversity combining techniques. In the first part of this thesis, we focus on the equal gain combining (EGC) and hybrid-selection equal gain combining (HS/EGC) for bandwidth-efficient wireless systems (i.e. QAM systems). For EGC QAM systems, we propose the receiver structure and the corresponding decision variables, and then study the effects of imperfect channel estimation (ICE) and quantify the loss of the signal-to-noise ratio (SNR) gain caused by ICE. For HS/EGC QAM system, we develop a general approach to derive unified error rate and outage probability formulas over various types of fading channels based on the proposed HS/EGC receiver. The main contribution of this work lies in that it provides effective hybrid diversity schemes and new analytical approaches to enable thorough analysis and effective design of bandwidth efficient wireless communication systems which suffer from ICE and operate in realistic multipath channels. Channel statistic information is proven to be critical in determining the systems design, achievable data rate, and achievable performance. In the second part of this thesis, we study the estimation of the fading channel statistics. We propose several iterative algorithms to estimate the first- and second-order statistics of general fading or composite fading-shadowing channels and derive the Cramer-Rao bounds (CRBs) for all the cases. We demonstrate that these iterative methods are efficient in the sense that they achieve their corresponding CRBs. The main contribution of this work is that it bridges the gap between the broad utilization of fading channel statistical properties and the lack of systematic study that makes such statistical properties available.