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![Figure 12. System architecture for protocol conversion [43].](profile/Luca-Caviglione/publication/220123721/figure/fig7/AS:393954269908992@1470937425112/System-architecture-for-protocol-conversion-43_Q320.jpg)
This is the second part of the tutorial paper following the previous tutorial paper describing enabling technologies in digital video broadcasting (DVB) system. The paper presents the current and future operational scenarios for DVB via satellite (DVB-S) system. Review of the current state-of-the-art technologies consisting of integration of broadb...
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While Japanese broadcasters and manufacturers have been world pioneers in the development of high-definition television and
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This work considers the use of dual-reflector antennas for omnidirectional coverage in a LMDS system base station to operate with the distribution of digital TV signals. We investigate the performance of omnidirectional antenna with and without dielectric radome. Numerical simulations based the method of moments are presented to illustrate the usef...
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... Introduction of digital video broadcasting (DVB) systems to communications satellites was a milestone paradigm shift for the important role communication satellites are playing today in broadcasting, telecommunications, mobile communications, convergence with voice, video and data as well as terrestrial telecommunications technologies. (Ong et al, 2007; Liang et al, 2007). The Digital Video Broadcasting (DVB) Project, an industry-led and market-led consortium of private and public organizations including regulatory bodies committed themselves to designing open interoperable standards for global delivery of digital and broadcast services considering the prevalence of proprietary architectures and technologies of communication satellite transmission and broadcast technologies. ...
The world’s first geosynchronous communications satellite was launched by NASA as Syncom-2 in 1963, followed by Syncom-3 in 1964, which was the world’s first geostationary communications satellite. The Syncom Satellite program sought to add value to the first man-made Russian satellite called SPUTNIK, which was launched on 4th October, 1957; this initiated the development of communication satellite technologies that have evolved and blossomed over the subsequent decades. Some important advances are noted: the transition from analogue to digital transmissions; enhanced coding schemes and error correction measures; the use of higher frequency spectrum windows, such as the Ku and Ka band and multi-spot beams ushered in High Throughput Satellites (HTS), which compete favourably with terrestrial broadband technologies as well as addressing the cost of acquisition sustainably using the very small aperture terminal (VSAT) as the essential customer premises equipment (CPE) together with associated technologies. Digital video broadcasting (DVB) was a paradigm shift for the important role that communications satellites play in today’s: broadcasting, telecommunications and mobile communications market. The convergence of voice, video and data as well as terrestrial telecommunications technologies has also redefined the market.
This paper examines the strategic advantages bestowed by modern communications satellites, satellite communication techniques and innovations in addressing effective universal access goals and digital inclusion without exclusivity. It raises the ICT Development Index (IDI) of nations with inadequate terrestrial ICT infrastructure, especially nations that lack the last mile infrastructure such as: inter-city and intra-city metro-ring optical fibres, which facilitate broadband penetration. Communication Satellites remain the “low hanging fruit” that drives and accelerates cross border connectivity in the African hinterlands and landlocked countries to meet the short and medium term goals of providing broadcasting, Internet access and other value added services to overcome the terrestrial limitations in a timely and effective manner; thus permitting such nations to engage with the global economy and worldwide communications network growth. COMSATs are also strategic and critical ICT infrastructure in facilitating timely disaster management in all its phases including network recovery.
... Interactivity is a key issue in modern telecommunication networks even in traditional distribution services like TV or radio [1]. Modern satellite services require two-way interactive connections. ...
Broadband satellite access (BSA) systems can form an alternative path for the provision of Internet access in areas with poor network infrastructure. The DVB-RCS standard introduced the specifications of an interaction channel for two-way BSA networks. In this study, a new dynamic scheduling strategy for the interaction channel of GEO satellite networks is proposed, evaluated and compared with a typical Round Robin scheme. The main idea of the proposed strategy is to change, prior to each allocation, the sequence according to which bandwidth is assigned to the satellite terminals. The new sequence is fully specified by a set of fairness indices, each one related to a unique terminal and updated after each allocation. Along with the examined scheduling strategies, two capacity request calculation techniques found in the literature are also evaluated and compared through a series of simulations. Copyright © 2010 John Wiley & Sons, Ltd.
... Multiservice applications used in this study are Voice over IP (VoIP), Video on Demand (VoD) and file transfer (FTP), in which according to DiffServ architecture they classified as EF, AF and BF. The typical QoS requirements of such services are given in TABLE I [10][11][12]. ...
Next generation satellite network (NGSN) possesses unique characteristics; large coverage area, quick deployment, native broadcasting/multicasting capability, multiple spotbeams, high bandwidth and on-broad processor (OBP). These features enable NGSN to play an important role in providing ubiquitous global Next Generation Internet (NGI). The original Internet is restricted mainly to terrestrial network and supports only best effort service. NGI is to support multiservice applications with service differentiation and extending Internet access beyond the reach of terrestrial network. Based on the integrated satellite- terrestrial network, a main infrastructure for global ubiquitous Internet is envisaged and Internet applications can be accessed anywhere anytime. However, one of the key successes depends mainly on the capabilities of the satellite OBP. Without it, the preservation of end-to-end (e2e) service differentiation has to be dealt with at ground hub stations, thus increasing e2e delay. This paper studies the impacts of different on-board queueing schemes on the quality of multiservice applications on NGI and suggests that the quality of multiservice applications is generally enhanced if the on-board service differentiation is supported.
Este trabalho apresenta uma proposta de padro- nização para o desenvolvimento unificado de aplicações in- teroperáveis entre web, TV digital e celular. O principal objetivo é evitar a redundância na produção de conteúdo, focalizando a adaptação entre as diferentes plataformas, em lugar da criação e manutenção exclusiva para cada um. São apresentadas recomendações com base em padrões internacionais, buscando-se minimizar as rupturas nos pro- cessos atuais de criação de objetos de aprendizagem. Para validar a proposta, duas aplicações interoperáveis foram desenvolvidas: uma, envolvendo apenas textos e menus; a outra, muito mais complexa, envolvendo um curso de en- sino completo. Ambas as aplicações validaram a proposta apresentada com sucesso.
This paper presents a proposal for unified development of learning objects, for access by digital TV, Web and mobile phones, yonder a metadata extension that allow cataloguing and recovery them by the same platforms. First, the common formats and programming languages available are described, such as the main metadata standards for each platform. As result, several recommendations for interoperability are presented. This proposal was validated and is part of OBAA brazilian standard [1], that researches interoperability using multiagent systems.
Despite all the advances in science and technology, humankind remains vulnerable to the effect of natural and man-made disasters. Disasters such as floods, volcanic eruptions, earthquakes, tsunamis, avalanches, landslides, hurricanes, tropical storms, typhoons, wild-fires etc, leave behind devastating destruction resulting in: human injury and loss of life, environmental damage, health hazards, economic disruption and many other challenges.
This paper seeks to examine the importance of communications-disaster preparedness of nations, regions and especially the continent of Africa through the provision of strategic three-play services (Voice, Video & Data) using communication satellite systems as the first line of action to facilitate reliable and timely disaster response.
Considering the criticality of telecommunications at all phases of disaster management, the International Telecommunications Union (ITU) currently has a focus-group working on: disaster relief, network resilience and recovery. The focus-group is co-ordinating the ITU Telecommunication (ITU-T) Standardization sector work in the disaster relief field.
Response to disasters by national emergency agencies of underdeveloped and developing nations with inadequate or little terrestrial communication infrastructure should not only be limited to food, water and shelter but also economic sustainability. 21st century communications technology can deliver immediate effects in facilitating relief coordination in the affected areas. The rapid response emergency networks not only coordinate disaster relief for individuals to find their loved ones, but also disaster relief guidance and routes to access: aid, evacuation centers and shelters, e-health services and makeshift medicare and medication centers. Emergency response networks can broadcast information from the government of the affected nation and assist in facilitating and coordinating help from aid donors etc. Such an emergency network can also play a pivotal role by providing a secured and integrated communications public safety network to security agencies (i.e Police, Military, Airforce and paramilitary units); specialized emergency service units and organizations such as: Fire Fighters, Road safety teams, Mobile medical units and thus efficiently deliver information symmetry to multiple agencies to ensure coordinated first-response effectiveness.
The NigComSat-1R communications satellite is a strategic continental ICT infrastructure provider in Sub-Saharan Africa; that is enhancing telecommunications, broadcasting, emergency networks and other value-added telecommunications services such as real-time monitoring services and navigation in Africa.
Variations in the supply and demand of telecommunications infrastructure in the United States are well documented. However, amidst waning concerns of a broadband digital divide, the geographic aspects of broadband availability continue to be intriguing. While some areas benefit from a robust selection of broadband providers, choices for consumers in other regions are often limited. The purpose of this paper is to explore the spatially unbalanced levels of broadband provision in the USA by providing an abbreviated longitudinal analysis of broadband regions and their development from 1999 to 2004. Broadband core and periphery regions are identified through the use of spatial statistical techniques and a geographic information system. A broadband competition index for ranking metropolitan and micropolitan areas is also introduced.
