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This book constitutes the refereed proceedings of the 4th International Workshop on Multiple Access Communications, MACOM 2011, held in Trento, Italy, in September 2011. The 21 full papers papers presented were carefully reviewed and selected from more than 40 submissions. They are divided in topical sections on cognitive radio; MAC protocols; communications theory; special session on MAC protocols for WSNs; system analysis and scheduling; and queuing systems.

Multiple access protocols (Computer network protocols) --- Queuing networks (Data transmission) --- Wireless communication systems --- Ad hoc networks (Computer networks) --- Electrical & Computer Engineering --- Engineering & Applied Sciences --- Telecommunications --- Information Technology --- Computer Science (Hardware & Networks) --- Digital communications --- Local area networks (Computer networks) --- Computer science. --- Computer communication systems. --- Software engineering. --- Data encryption (Computer science). --- Algorithms. --- Management information systems. --- Computer Science. --- Computer Communication Networks. --- Algorithm Analysis and Problem Complexity. --- Information Systems Applications (incl. Internet). --- Management of Computing and Information Systems. --- Software Engineering. --- Data Encryption. --- Computer-based information systems --- EIS (Information systems) --- Executive information systems --- MIS (Information systems) --- Sociotechnical systems --- Information resources management --- Management --- Algorism --- Algebra --- Arithmetic --- Data encoding (Computer science) --- Encryption of data (Computer science) --- Computer security --- Cryptography --- Computer software engineering --- Engineering --- Communication systems, Computer --- Computer communication systems --- Data networks, Computer --- ECNs (Electronic communication networks) --- Electronic communication networks --- Networks, Computer --- Teleprocessing networks --- Data transmission systems --- Electronic systems --- Information networks --- Telecommunication --- Cyberinfrastructure --- Electronic data processing --- Network computers --- Informatics --- Science --- Communication systems --- Foundations --- Distributed processing --- Computer software. --- Information Systems. --- Cryptology. --- Software, Computer --- Computer systems --- Application software. --- Application computer programs --- Application computer software --- Applications software --- Apps (Computer software) --- Computer software

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This book constitutes the thoroughly refereed post-conference proceedings of the Third International ICST Conference on Personal Satellite Services, PSATS 2011, held in Malaga, Spain, in February 2011. The 33 revised full papers presented were carefully reviewed and selected and cover a wide range of topics such as multimedia IP, next generation satellite networks, bandwidth allocation, aeronautic communications for air traffic management, DVB-S2, hybrid networks, delay tolerant networking, channel estimation and interference management, satellite antenna design, and localization systems.

Mass communications --- Computer architecture. Operating systems --- computernetwerken --- communicatietechnologie

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It is our great pleasure to present the proceedings of the Third International Workshop on Multiple Access Communications (MACOM) that was held in Barcelona during September 13-14, 2010. In 1961, Claude Shannon established the foundation for the discipline now known as multi-user information theory  in his pioneering paper Two-way Communication Channels,  and later Norman Abramson published his paper The Aloha System Another Alternative for Computer Communications  in 1970 which introduced the concept of multiple access using a shared common channel. Thereafter, for more than 40 years of study, numerous elegant theories and algorithms have been developed for multiple-access communications. During the 1980s and 1990s the evolution of multiple-access techniques p- ceeded in conjunction with the evolution of wireless networks. Novel multiple access techniques like code division multiple access (CDMA) and orthogonal frequency division multiple access (OFDMA) provided increased spectral - ?ciency, dynamicity and ?exibility in radio resource allocation with intrinsic anti-multipath and anti-interference features. In this ?rst decade of the 21st century,multiple-accesstechniques,derivedfromadvancedwirelesstransmission methodologiesbasedonthediversityconcept(e. g. ,MC-CDMA,MIMO-OFDMA and SC-FDMA), opened the road to a renewed idea of multiple access. Today multiple-access communications involve many challenging aspects not only l- ited (like in the past) to physical layer design. Medium access control (MAC) techniques play a crucial role in managing the radio resources that users will exploit to transmit their data streams. Recent developments in software radios and cognitive radios have led to a signi?cant impact also on spectrum m- agement and access paradigms.

Complex analysis --- Computer science --- Programming --- Computer architecture. Operating systems --- Information systems --- Computer. Automation --- MIS (management informatie systeem) --- complexe analyse (wiskunde) --- applicatiebeheer --- apps --- computers --- computerbesturingssystemen --- programmeren (informatica) --- informatiesystemen --- software engineering --- algoritmen --- informatica management --- computernetwerken --- computerkunde --- architectuur (informatica)

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Complex analysis --- Computer science --- Computer architecture. Operating systems --- Computer. Automation --- DES (data encryption standard) --- complexe analyse (wiskunde) --- software engineering --- informatica management --- computernetwerken

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This book provides an overview of the latest R&D advancements in the field of ICT technologies inherent to a New Space vision. The book presents a system-level and technology-level description of future space networking and communications. The authors also expand the vision to interplanetary networks. The book spans hardware and software technologies for future space communication networks, also considering very modern paradigms like quantum technologies and Softwarization. In the book, the word "space" is intended in a wider sense than the usual "satellite communications", including new and partially unexplored fields like quantum space communications, interplanetary communications, and extra-terrestrial Radio Access Networks (RANs). The book includes applications including Internet of Space Things, Tactile Internet/Digital twins for Space and discusses future challenges like those involved by the concept of "sustainable Space". Provides an overview of the latest R&D advancements in the field of ICT technologies inherent to a New Space vision; Considers visions and perspectives of space technology, including a through overview of satellite communications; Presents a system-level overview of future space networking and communications.

Space research --- Astronomy --- Spectrometric and optical chemical analysis --- Telecommunication technology --- Applied physical engineering --- Air traffic --- Mass communications --- astronauten --- tekstverwerking --- engineering --- luchtvaart --- ruimtevaart --- communicatietechnologie --- spectrometrie