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1. |
Record Nr. |
UNINA9910144238003321 |
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Autore |
Aragón-Zavala Alejandro |
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Titolo |
High-altitude platforms for wireless communications / / Alejandro Aragón-Zavala, José Luis Cuevas-Ruiz, José Antonio Delgado-Penín |
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Pubbl/distr/stampa |
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Chichester, U.K. : , : Wiley, , 2008 |
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[Piscataqay, New Jersey] : , : IEEE Xplore, , [2008] |
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ISBN |
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1-281-84134-X |
9786611841348 |
0-470-99743-5 |
0-470-99742-7 |
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Descrizione fisica |
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1 online resource (257 p.) |
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Altri autori (Persone) |
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Cuevas-RuizJosé Luis |
Delgado-PenínJosé Antonio |
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Disciplina |
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Soggetti |
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High altitude platform systems (Telecommunication) |
Antennas (Electronics) |
Wireless communication systems - Equipment and supplies |
Artificial satellites in telecommunication |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Description based upon print version of record. |
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Nota di bibliografia |
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Includes bibliographical references and index. |
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Nota di contenuto |
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Preface. -- 1 Introduction. -- 1.1 What is a HAPS? -- 1.2 Structure of the Book. -- 2 Overview on HAPS. -- 2.1 HAPS System Concepts. -- 2.2 Radio Regulations for HAPS. -- 2.3 Applications and Services. -- 2.4 HAPS Networks. -- 2.5 Terrestrial, Satellite and Stratospheric Communication Systems: A Comparison. -- 2.6 Survey of the Evolution and State-of-the-Art of HAPS in the World. -- 3 Propagation and Channel Modelling. -- 3.1 Introduction. -- 3.2 An Overview of Propagation Phenomena. -- 3.3 Channel Modelling. -- 3.4 Fading Mitigation Techniques. -- 3.5 Conclusions. -- 4 Antennas for HAPS. -- 4.1 Introduction. -- 4.2 Antenna Requirements. -- 4.3 Antenna Types for High-Altitude Platforms. -- 4.4 Antenna Design Recommendations at Operating Frequencies Allocated to HAPS. -- 4.5 Steering Mechanisms. -- 4.6 Beamforming. -- 4.7 Challenges. -- 5 Communication Systems Based on HAPS. -- 5.1 Components of HAPS Communication Systems. -- 5.2 Spectrum Allocation for HAPS. -- 5.3 |
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HAPS Link Budget. -- 5.4 Conclusions. -- 6 HAPS Networks. -- 6.1 Introduction. -- 6.2 Network Topologies. -- 6.3 Network Architectures for Service Candidates. -- 6.4 Interworking Requirements. -- 6.5 HAPS Networks for Other Applications. -- 6.6 Free Space Optical Links in HAPS. -- 6.7 Resource Management. -- 6.8 HAPS as Part of Integrated Communication Networks. -- 7 The Future. -- 7.1 Introduction. -- 7.2 Challenges and Opportunities for Civil UAS. -- 7.3 Applications for Civil UAS. -- 7.4 Requirements for the Future of the Civil UAS. -- 7.5 Technological Trends. -- 7.6 Technological Challenges for HAPS Applied to Wireless Communications. -- 7.7 Conclusions. -- References. -- Glossary. -- Index. |
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Sommario/riassunto |
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Provides an introduction to High-Altitude Platform Stations (HAPS) technology and its applications for wireless communications High-altitude platform stations offer a promising new technology that combines the benefits of terrestrial and satellite communication systems for delivering broadband communications to users at a low cost. They are easily deployable and easy to maintain, which is why they offer a good alternative for network operators who need to find ways to get more coverage to satisfy the increasing demand for more capacity. HAPS are usually balloons, airships or unmanned aerial systems (UAS) located in the stratosphere. An enormous interest has grown worldwide to examine their use not only for broadband communications, but also for emergency services, navigation, traffic monitoring, cellular, etc. Key features include: . Unique book focusing on emerging HAPS technology and its applications . Provides a thorough overview of the technology including HAPS-based communications systems, antennas for HAPS, radio propagation and channel modelling issues and HAPS networking aspects . Presents various HAPS-related projects and initiatives developed throughout the world (North America, Europe and Asia-Pacific) . Features a comprehensive overview on both aeronautical and telecommunications regulatory aspects, which will affect the deployment and future developments in the field of HAPS High-Altitude Platform Systems for Wireless Communications will prove essential reading for postgraduate students in the field of HAPS, engineers, developers and designers involved in the design and maintenance of HAPS, aerospace engineers, and communications system planners and researchers. |
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2. |
Record Nr. |
UNINA9910778953103321 |
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Autore |
Fraga Luis Ricardo |
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Titolo |
Latinos in the new millennium : an almanac of opinion, behavior, and policy preferences / / Luis R. Fraga [and others] [[electronic resource]] |
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Pubbl/distr/stampa |
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Cambridge : , : Cambridge University Press, , 2012 |
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ISBN |
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1-107-23062-4 |
1-139-21013-0 |
1-280-56890-9 |
1-139-22313-5 |
9786613598509 |
1-139-08357-0 |
1-139-21833-6 |
1-139-22485-9 |
1-139-21524-8 |
1-139-22142-6 |
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Descrizione fisica |
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1 online resource (viii, 439 pages) : digital, PDF file(s) |
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Classificazione |
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Altri autori (Persone) |
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Disciplina |
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Soggetti |
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Hispanic Americans - Politics and government - 21st century |
Hispanic Americans - Ethnic identity |
Hispanic Americans - Attitudes |
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Lingua di pubblicazione |
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Formato |
Materiale a stampa |
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Livello bibliografico |
Monografia |
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Note generali |
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Title from publisher's bibliographic system (viewed on 05 Oct 2015). |
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Nota di bibliografia |
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Includes bibliographical references and index. |
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Nota di contenuto |
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Latinos in the new millennium: knowledge and misperceptions -- A demographic profile of Latinos in the United States -- Core values: beliefs and the "American creed" -- Latino identities: commonalities and competition -- Latino transnationalism: continuities and breaks with countries of origin -- Intergroup relations: a diverse Latino community -- Civic engagement: entering the political process -- Latino media and technology usage -- Voter registration, turnout, and choice -- Evolving patterns and preferences in Latino partisanship -- Latinos and gender role attitudes -- Latino issues and policy preferences -- Hope and reality in Latino educational attainment -- Latinos and the future of American politics. |
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Sommario/riassunto |
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Latinos in the New Millennium is a comprehensive profile of Latinos in the United States: looking at their social characteristics, group relations, policy positions and political orientations. The authors draw on information from the 2006 Latino National Survey (LNS), the largest and most detailed source of data on Hispanics in America. This book provides essential knowledge about Latinos, contextualizing research data by structuring discussion around many dimensions of Latino political life in the US. The encyclopedic range and depth of the LNS allows the authors to appraise Latinos' group characteristics, attitudes, behaviors and their views on numerous topics. This study displays the complexity of Latinos, from recent immigrants to those whose grandparents were born in the United States. |
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