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• W2337635094 abstract "In September 1993, the Digital Video Broadcasting (DVB) project was launched, with the purpose of promoting the switchover from analogue to digital television (TV) broadcasting. It was a private, market-driven association, including all the main actors in digital TV such as broadcasters, network operators, manufacturers and regulators. Thanks to the achievements in the field of digital VLSI technology, both in the transmission and in the source coding areas, the first milestone of the DVB project was the specification of DVB-S. This was DVB's digital, multi-programme, TV system for satellite broadcasting that together with the adoption of MPEG2, introduced satellite direct-to-home (DTH) digital TV. With the worldwide success of this system, it became clear that it could also be suitable for digital satellite news gathering (DSNG) applications, with significant advantages in cost, performance and flexibility over the previous systems. In the summer of 1997, the DVB Project decided to start the development of a new specification for DSNG, based on the DVB-S system but with a number of new features added to cover the commercial and operational requirements of contribution applications. At the same time, DVB-S became the basis of the so called ‘DVB family’, on which the first generation digital standards for cable (DVB-C) and terrestrial (DVB-T) broadcasting were built. In 2003, 10 years after the standardization of DVB-S, DVB-S2 1 was the first physical layer system of a new generation of digital standards to be developed in the DVB family. It set the benchmark for technical excellence, drove the design concepts for terrestrial and cable applications and along with MPEG4, led the way for introduction of high-definition TV services. However, DVB-S2 was no longer only a system for DTH broadcasting, but one for interactivity (i.e. internet access) and professional services (e.g. TV contribution links and DSNG) as well. To be able to cover all the application areas, while still keeping the single-chip decoder at reasonable complexity levels, DVB-S2 was structured as a toolkit, thus enabling the use of mass market products for professional or niche applications. In 2013, 10 years after the development of DVB-S2, following a request by the Commercial and Technical Modules, the DVB-S2 group started to analyse a further evolution of satellite technologies to enhance performance in the core markets (DTH, contribution, Very Small Aperture Terminal (VSAT) and DSNG) and to increase the range of applications of the standard to cover emerging markets such as mobile (air, sea and rail) or professional applications. The DVB-S2X 2 is an extension of the DVB-S2 specification that provides additional technologies and features for the core applications of DVB-S2 including DTH, contribution, VSAT and DSNG. The specification also provides an extended operational range to cover emerging markets such as mobile applications. The DVB-S2X has been introduced at the same time as the new high efficiency video coding (HEVC) scheme. It is expected that new satellite DTH receivers will combine these two technologies to make the delivery of HD and especially ultra HD (UHD) services more efficient. For professional services and DSNG applications, the finer modulation and coding granularity and the new, highly efficient modulation schemes allow spectral efficiencies approaching 6 bps/Hz, facilitating optimized satellite capacity for a wide range of Signal to Noise Ratio (SNRs) including very low and very high SNR values. For broadband interactive services and VSAT applications, the DVB-S2X specification offers advanced techniques such as intra-system interference mitigation, beam-hopping and multi-format transmissions. These techniques are made possible by the new super-framing structure, and when implemented, they may offer significant gains in capacity and flexibility for broadband interactive satellite networks. Recent news from the chip manufacturers seem to indicate that, like its predecessors DVB-S and S2, DVB-S2X will be a successful standard; several leading chip vendors are offering DVB-S2X compatible silicon. This is a clear indication that the DVB-S2X standard has been adopted by the industry and the first STBs and iDTVs with DVB-S2X capability are likely to be launched as early as 2016. The papers in this issue allow the reader to learn about the main features of DVB-S2X. The first paper 3 gives a rapid insight into the new standard, providing information about the main features that characterize it. The following papers delve into the detail of DVB-S2X. In 4, the optimization of transmission parameters is discussed, the design of an efficient receiver for DVB-S2X systems is addressed, and the performance of the proposed scheme is assessed in comparison with a classical DVB-S2 architecture. In 5, the new DVB-S2X constellations for improved performance on the satellite channel are presented. While DVB-S2 considered amplitude phase shift keying (APSK) constellations with ring ratios optimized for the linear AWGN channel, S2X focused on a more realistic non-linear channel model, which reflects the behaviour of modern linearized traveling wave tube amplifiers. In addition, taking into account that for certain operation modes, the satellite link can also be considered as an instance of the classical linear AWGN channel, non-uniform constellations have been introduced. The DVB-S2X physical layer performance over realistic channel models is discussed in 6, where particular emphasis is devoted to the maximization of the spectral efficiency as a function of the transmission symbol rate and in combination with the roll-off factor of the pulse-shaping filter, in the presence of state-of-the-art modulation and demodulation techniques. The novel VL-SNR frames for use in noisy environments are described in 7. This paper provides a high-level discussion on several of the most important aspects pertaining to the new VL-SNR modulation and coding modes that offer better support for mobile and very small terminal applications. In 8, the potential system performance improvements that can be achieved by deploying the techniques available from DVB-S2X in satellite broadcast and unicast broadband networks (VSAT scenario) are identified. It is shown that the combination of DVB-S2X features offers significant advances and opportunities to service providers, particularly in emerging systems such as multi-beam Ka-band broadband as well as broadcasting satellite networks. The authors in 9 describe the DVB-S2X super framing structure for next generation satellite broadband systems. The paper provides the rationale, design choices, potential applications and performance gains of SF structure particularly in the context of satellite broadband systems. The authors in 10 propose precoding techniques for DVB-S2X broadband unicast networks and highlights the practical issues that arise when precoding is applied over an aggressive frequency re-use High Throughput Satellite (HTS) network. Dr. Alberto Morello graduated in Electronic Engineering from the Politecnico di Torino in 1982 and took his doctorate degree in 1987. He joined RAI, the Public Italian Broadcaster, in 1985, as a Telecommunications researcher at the Research and Development Centre in Turin, where he became Director in 1999. He was engaged in research on advanced digital modulation and coding techniques for television and sound broadcasting and participated to a number of European Research and Development Projects. He is an author of technical/scientific articles on leading reviews like IEEE Transactions and the EBU Technical Review and regularly contributes to national and international conferences. He had a primary role in the RAI digital HDTV experiments via Olympus satellite (Italia '90), and in the definition of the DVB systems for digital multi-programme TV broadcasting by satellite and terrestrial channels (DVB-S, DVB-SNG, DVB-T, DVB-T2, and DVB-NGH). He is the chairman of the TM-S ad hoc group of the Technical Committee. From 2008 to 2012, he was chairman of the EBU Technical Committee. Vittoria Mignone received the ‘Laurea in Ingegneria Elettronica’ degree from Politecnico di Torino, in 1990. She has been with the RAI Research Centre since 1992, involved in the studies for the definition of the ETSI Standards for digital television by satellite, cable, and terrestrial channels. Her activities are in the field of advanced digital modulation and channel coding techniques for satellite and terrestrial transmissions. She is an author of patents and technical papers." @default.
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• W2337635094 title "DVB-S2X: the new extensions to the second generation DVB satellite standard DVB-S2" @default.
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• W2337635094 doi "https://doi.org/10.1002/sat.1167" @default.
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