158 research outputs found
Cooperative Radio Communications for Green Smart Environments
The demand for mobile connectivity is continuously increasing, and by 2020 Mobile and Wireless Communications will serve not only very dense populations of mobile phones and nomadic computers, but also the expected multiplicity of devices and sensors located in machines, vehicles, health systems and city infrastructures. Future Mobile Networks are then faced with many new scenarios and use cases, which will load the networks with different data traffic patterns, in new or shared spectrum bands, creating new specific requirements. This book addresses both the techniques to model, analyse and optimise the radio links and transmission systems in such scenarios, together with the most advanced radio access, resource management and mobile networking technologies. This text summarises the work performed by more than 500 researchers from more than 120 institutions in Europe, America and Asia, from both academia and industries, within the framework of the COST IC1004 Action on "Cooperative Radio Communications for Green and Smart Environments". The book will have appeal to graduates and researchers in the Radio Communications area, and also to engineers working in the Wireless industry. Topics discussed in this book include: • Radio waves propagation phenomena in diverse urban, indoor, vehicular and body environments• Measurements, characterization, and modelling of radio channels beyond 4G networks• Key issues in Vehicle (V2X) communication• Wireless Body Area Networks, including specific Radio Channel Models for WBANs• Energy efficiency and resource management enhancements in Radio Access Networks• Definitions and models for the virtualised and cloud RAN architectures• Advances on feasible indoor localization and tracking techniques• Recent findings and innovations in antenna systems for communications• Physical Layer Network Coding for next generation wireless systems• Methods and techniques for MIMO Over the Air (OTA) testin
Hybrid Free-Space Optical and Visible Light Communication Link
V souÄŤastnosti bezdrátovĂ© optickĂ© komunikace (optical wireless communication, OWC) zĂskávajà širokou pozornost jako vhodnĂ˝ doplnÄ›k ke komunikaÄŤnĂm pĹ™enosĹŻm v rádiovĂ©m pásmu. OWC nabĂzejĂ nÄ›kolik vĂ˝hod vÄŤetnÄ› vÄ›tšà šĂĹ™ky pĹ™enosovĂ©ho pásma, neregulovanĂ©ho frekvenÄŤnĂho pásma ÄŤi odolnosti vĹŻÄŤi elektromagnetickĂ©mu rušenĂ. Tato práce se zabĂ˝vá návrhem OWC systĂ©mĹŻ pro pĹ™ipojenĂ koncovĂ˝ch uĹľivatelĹŻ. Samotná realizace spojenĂ mĹŻĹľe bĂ˝t provedena za pomoci rĹŻznĂ˝ch variant bezdrátovĂ˝ch technologiĂ, napĹ™Ăklad pomocĂ OWC, kombinacĂ rĹŻznĂ˝ch OWC technologiĂ nebo hybridnĂm rádio-optickĂ˝m spojem. Za účelem propojenĂ tzv. poslednĂ mĂle je analyzován optickĂ˝ bezvláknovĂ˝ spoj (free space optics, FSO). Tato práce se dále zabĂ˝vá analĂ˝zou pĹ™enosovĂ˝ch vlastnostĂ celo-optickĂ©ho vĂce skokovĂ©ho spoje s dĹŻrazem na vliv atmosfĂ©rickĂ˝ch podmĂnek. V dnešnĂ dobÄ› mnoho uĹľivatelĹŻ trávĂ ÄŤas ve vnitĹ™nĂch prostorech kancelářà či doma, kde komunikace ve viditelnĂ©m spektru (visible light communication, VLC) poskytuje lepšà pĹ™enosovĂ© parametry pokrytĂ neĹľ Ăşzce smÄ›rovĂ© FSO. V rámci tĂ©to práce byla odvozena a experimentálnÄ› ověřena závislost pro bitovou chybovost pĹ™esmÄ›rovanĂ©ho (relaying) spoje ve VLC. Pro propojenĂ poskytovatele datavĂ˝ch sluĹľeb s koncovĂ˝m uĹľivatelem mĹŻĹľe bĂ˝t vĂ˝hodnĂ© zkombinovat vĂce pĹ™enosovĂ˝ch technologiĂ. Proto je navrĹľen a analyzovám systĂ©m pro pĹ™ekonánĂ tzv. problĂ©mu poslednĂ mĂle a poslednĂho metru kombinujĂcĂ hybridnĂ FSO a VLC technologie.The field of optical wireless communications (OWC) has recently attracted significant attention as a complementary technology to radio frequency (RF). OWC systems offer several advantages including higher bandwidth, an unregulated spectrum, resistance to electromagnetic interference and a high order of reusability. The thesis focuses on the deployment and analyses of end-user interconnections using the OWC systems. Interconnection can be established by many wireless technologies, for instance, by a single OWC technology, a combination of OWC technologies, or by hybrid OWC/RF links. In order to establish last mile outdoor interconnection, a free-space optical (FSO) has to be investigated. In this thesis, the performance of all-optical multi-hop scenarios is analyzed under atmospheric conditions. However, nowadays, many end users spend much time in indoor environments where visible light communication (VLC) technology can provide better transmission parameters and, significantly, better coverage. An analytical description of bit error rate for relaying VLC schemes is derived and experimentally verified. Nonetheless, for the last mile, interconnection of a provider and end users (joint outdoor and indoor connection) can be advantageous when combining multiple technologies. Therefore, a hybrid FSO/VLC system is proposed and analyzed for the interconnection of the last mile and last meter bottleneck
Cooperative Radio Communications for Green Smart Environments
The demand for mobile connectivity is continuously increasing, and by 2020 Mobile and Wireless Communications will serve not only very dense populations of mobile phones and nomadic computers, but also the expected multiplicity of devices and sensors located in machines, vehicles, health systems and city infrastructures. Future Mobile Networks are then faced with many new scenarios and use cases, which will load the networks with different data traffic patterns, in new or shared spectrum bands, creating new specific requirements. This book addresses both the techniques to model, analyse and optimise the radio links and transmission systems in such scenarios, together with the most advanced radio access, resource management and mobile networking technologies. This text summarises the work performed by more than 500 researchers from more than 120 institutions in Europe, America and Asia, from both academia and industries, within the framework of the COST IC1004 Action on "Cooperative Radio Communications for Green and Smart Environments". The book will have appeal to graduates and researchers in the Radio Communications area, and also to engineers working in the Wireless industry. Topics discussed in this book include: • Radio waves propagation phenomena in diverse urban, indoor, vehicular and body environments• Measurements, characterization, and modelling of radio channels beyond 4G networks• Key issues in Vehicle (V2X) communication• Wireless Body Area Networks, including specific Radio Channel Models for WBANs• Energy efficiency and resource management enhancements in Radio Access Networks• Definitions and models for the virtualised and cloud RAN architectures• Advances on feasible indoor localization and tracking techniques• Recent findings and innovations in antenna systems for communications• Physical Layer Network Coding for next generation wireless systems• Methods and techniques for MIMO Over the Air (OTA) testin
- …