Indoor Infrared Wireless Communication Channels
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Indoor Infrared Wireless Communication Channels
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Author : Mohammad Reza Pakravan
language : en
Publisher:
Release Date : 2000
Indoor Infrared Wireless Communication Channels written by Mohammad Reza Pakravan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with categories.
The emergence of portable computing devices is expected to accelerate the introduction of wireless Local Area Networks (LANs). Portable devices require connectivity with low power consumption, small size and weight. The demand for inexpensive, high-speed communication links satisfying these requirements his encouraged the research on infrared wireless communications. In this thesis, the fundamentals of infrared communications and different suitable configurations are reviewed. The basic nature of the infrared channel, the differences between the infrared channel and radio frequency channel and the important communication problems faced by infrared systems are explained. An infrared channel simulation algorithm that is used to estimate its impulse response is described. An extensive set of measurements has been performed to investigate the effects of receiver rotation, receiver shadowing, receiver displacement, transmission configuration and communications environments on the characteristics of the infrared channel. The characteristics of the wide-band measurement system that was used to collect the infrared channel transfer functions are presented. The objectives, procedures, results and conclusions of these measurements are discussed and reported. Diffusers are an important element of infrared transmission systems. They are used to control the radiation pattern of the transmitter for efficiency and eye-safety. Holographic diffusers have been designed and manufactured to provide better infrared radiation patterns. These diffusers were used in the measurement setup to assess the performance enhancements that can be achieved by using holographic diffusers. The results show uniform and efficient use of optical power and better tolerance to shadowing by using these devices.
Indoor Infrared Wireless Communication Channels
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Author :
language : en
Publisher:
Release Date : 2000
Indoor Infrared Wireless Communication Channels written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with 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.
Broadband Indoor Wireless Communications Using Infrared
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Author : Mohammad Reza Pakravan
language : en
Publisher:
Release Date : 1994
Broadband Indoor Wireless Communications Using Infrared written by Mohammad Reza Pakravan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Broadband communication systems categories.
In this thesis, we discuss the issue of using infrared light as a carrier for broadband indoor wireless networks. We discuss the infrared channel and show how it differs from conventional radio frequency channel. Noise sources for this environment and the practical ways of reducing their harmful effects are discussed. We determine the safety levels for the radiated power of an IR transmitter and we show how the system should be designed to operate within the safety limits. We introduce a computer-simulation algorithm to find the impulse response of an indoor infrared channel and discuss several implementation issues for the algorithm. Using the simulation software, we investigate temporal and spatial distributions of the channel, e.g., the delay spread of impulse response and the total received optical power. We use the results of the simulations to investigate the effects of receiver rotation on the channel properties. We propose an angular diversity as a mean for performance improvement in an infrared receiver. Simulating the noise sources and signal sources in a typical indoor environment, we see how diversity improves the signal-to-noise ratio in a receiver with the angular diversity reception.
Broadband Indoor Wireless Communications Using Infrared
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Author : Mohammad Reza Pakravan
language : en
Publisher:
Release Date : 1994
Broadband Indoor Wireless Communications Using Infrared written by Mohammad Reza Pakravan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Broadband communication systems categories.
In this thesis, we discuss the issue of using infrared light as a carrier for broadband indoor wireless networks. We discuss the infrared channel and show how it differs from conventional radio frequency channel. Noise sources for this environment and the practical ways of reducing their harmful effects are discussed. We determine the safety levels for the radiated power of an IR transmitter and we show how the system should be designed to operate within the safety limits. We introduce a computer-simulation algorithm to find the impulse response of an indoor infrared channel and discuss several implementation issues for the algorithm. Using the simulation software, we investigate temporal and spatial distributions of the channel, e.g., the delay spread of impulse response and the total received optical power. We use the results of the simulations to investigate the effects of receiver rotation on the channel properties. We propose an angular diversity as a mean for performance improvement in an infrared receiver. Simulating the noise sources and signal sources in a typical indoor environment, we see how diversity improves the signal-to-noise ratio in a receiver with the angular diversity reception.
Wireless Infrared Communications
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Author : John R. Barry
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-12-06
Wireless Infrared Communications written by John R. Barry and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-12-06 with Technology & Engineering categories.
The demand for wireless access to network services is growing in virtually all communications and computing applications. Once accustomed to unteathered opera tion, users resent being tied to a desk or a fixed location, but will endure it when there is some substantial benefit, such as higher resolution or bandwidth. Recent technolog ical advances, however, such as the scaling of VLSI, the development of low-power circuit design techniques and architectures, increasing battery energy capacity, and advanced displays, are rapidly improving the capabilities of wireless devices. Many of the technological advances contributing to this revolution pertain to the wireless medium itself. There are two viable media: radio and optical. In radio, spread-spectrum techniques allow different users and services to coexist in the same bandwidth, and new microwave frequencies with plentiful bandwidth become viable as the speed of the supporting low-cost electronics increases. Radio has the advantage of being available ubiquitously indoors and outdoors, with the possibility of a seam less system infrastructure that allows users to move between the two. There are unan swered (but likely to be benign) biological effects of microwave radiation at higher power densities. Optical communications is enhanced by advances in photonic devices, such as semiconductor lasers and detectors. Optical is primarily an indoor technology - where it need not compete with sunlight - and offers advantages such as the immediate availability of a broad bandwidth without the need for regulatory approval.
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.
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.
Optical Wireless Communications
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Author : Roberto Ramirez-Iniguez
language : en
Publisher: CRC Press
Release Date : 2008-04-03
Optical Wireless Communications written by Roberto Ramirez-Iniguez and has been published by CRC Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2008-04-03 with Computers categories.
Over the last three decades, interest in Infrared (IR) technology as a medium to convey information has grown considerably. This is reflected by the increasing number of devices such as laptops, PDAs, and mobile phones that incorporate optical wireless transceivers and also by the increasing number of optical wireless links available for indoor and
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.