This paper discusses modulation and channel coding issues related to digital television terrestrial broadcasting (DTTB), such as data throughput, spectrum efficiency, single- and multi-carrier modulations, interferenc...
This paper discusses modulation and channel coding issues related to digital television terrestrial broadcasting (DTTB), such as data throughput, spectrum efficiency, single- and multi-carrier modulations, interferences under simulcasting conditions and multi-layer services.
Recent advances in communication technology have brought digital transmission of television services from the realm of a future possibility to a near-term practical reality. The commonly held view is that the applicat...
Recent advances in communication technology have brought digital transmission of television services from the realm of a future possibility to a near-term practical reality. The commonly held view is that the application of digital technology to the television sciences will provide higher picture and sound quality than conventional terrestrial television transmission and, at the same time, increase the efficiency of spectrum utilization by allowing multiple program services to be broadcast in current single-program channels. For digital services to be successful, there must be a consensus on standards in areas such as source and channel coding, modulation methods, content identification, and error protection and correction. A model of a digital terrestrial television broadcast (DTTB) system was developed by the International Telecommunications Union (ITU) Radio-communications Task Group 11/3 on Digital Terrestrial Television Broadcasting (DTTB) as a means of analyzing the system requirements. The model developed by the Task Group is described.
Digital technology was first picked up as a means to convey HDTV signals when analog technology proved to be insufficient. This was the original reason for us to choose a digital solution for HD-DIVINE, and I guess th...
Digital technology was first picked up as a means to convey HDTV signals when analog technology proved to be insufficient. This was the original reason for us to choose a digital solution for HD-DIVINE, and I guess the same is true for the digital proposals in the U.S. Now that we have our digital systems it turns out that we are facing a completely new media situation. With digital systems we can use a computer to receive and process signals. This allows for interactive services, where several concurrent services can be selected individually by the viewer and merged together to form a completely new and tailor-made experience for each viewer. The capacity to caiq TV signals of the available media will multiply compared with today, while digital technology will bring down distribution and production costs. The individual viewer can choose to receive signals from broadcasters, specialist companies delivering through telecom networks, different kinds of computer software to process and interconnect different services, databases on CD-ROM, other individuals sending information, etc. What we can see is a completely different media landscape; new structures and services will emerge and each player today has to redefine his own role now to be fit for tomorrow.
In the telecommunications industry of today and tomorrow, service is and will increasingly become a key element in the value proposition, and a key vehicle of competitive advantage. The network has a key role to play ...
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In the telecommunications industry of today and tomorrow, service is and will increasingly become a key element in the value proposition, and a key vehicle of competitive advantage. The network has a key role to play in this scenario. Other elements of central importance include the efficiency and flexibility of the supplier's business processes; the effectiveness of the IT applications and databases which support them; and the quality and values of the people through whom customers interface with suppliers. The most highly valued elements of service, assessed from the viewpoint of a large corporate customer are seen as speed and flexibility of configuration, reliability (as distinct from service availability), and control.< >
This paper assesses the extent to which such tools affect the operations of businesses within the service provisioning area, and speculates on the continued development away from traditional programming methods. It co...
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This paper assesses the extent to which such tools affect the operations of businesses within the service provisioning area, and speculates on the continued development away from traditional programming methods. It concentrates on the way in which use of a proprietary Unix-based graphical service creation and management tool, hosted on a pair of Sun workstations, has revolutionised development of services in-house. The potential implications for operators and service providers are drawn out.< >
Digital television offers unprecedented possibilities to deliver television programs and associated stereophonic sound and data channels to the home with quality that is very close to that of the original studio progr...
Digital television offers unprecedented possibilities to deliver television programs and associated stereophonic sound and data channels to the home with quality that is very close to that of the original studio program. As recently as the beginning of this decade it was widely accepted that the emission of such programs would require very high bandwidths, especially in the case of high definition television, and for that reason broadcasting engineers were basing their future plans on delivery media where large bandwidths were more readily available, such as satellite and cable systems.
The full impact of the 'Intelligent Network' (IN) or the 'Advanced Intelligent Network' (AIN) is being felt in Europe. The main driving forces for AIN are the new revenue opportunities for service prov...
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The full impact of the 'Intelligent Network' (IN) or the 'Advanced Intelligent Network' (AIN) is being felt in Europe. The main driving forces for AIN are the new revenue opportunities for service providers which make use of the ubiquity of their networks. This paper outlines steps towards ensuring that equipment has the necessary capability/functionality (intelligence) to realize the potential of these opportunities. 'Call Centres, shows how complex high value applications can be built up. 'Global VPNs' illustrates the global potential of AIN services. The functional units of the IN architectures are outlined for Europe and for North America. Some of the challenges to equipment suppliers that follow from these architectures are discussed. In a European context these challenges are technical, organizational, and regulatory.< >
The author draws attention to the introduction of different ways in which new services can be provided, by the addition of extra software to existing exchanges within the PSTN, by software enhancements to Public Land ...
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The author draws attention to the introduction of different ways in which new services can be provided, by the addition of extra software to existing exchanges within the PSTN, by software enhancements to Public Land Mobile Networks (PLMNs), and by specialised equipment residing at the extremities of the network, often PC based. A further option is now available with the advent of Intelligent Networks. Service engineering is described as it is applied to implementation on an Intelligent Network. Network operators and service providers must face these particular problems and make choices as to the best way to implement a new service.< >
The case study presented introduces the background to the development of the Nimrod AEW (Airborne Early Warning System) and its eventual demise. The Nimrod programme represents the largest development effort of its ti...
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The case study presented introduces the background to the development of the Nimrod AEW (Airborne Early Warning System) and its eventual demise. The Nimrod programme represents the largest development effort of its time. In the context of forensic ECBS, it represents a classical catalogue of failures.< >
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