Digital Video Broadcasting – Satellite – Second Generation (DVB-S2) is a digital television broadcast standard that has been designed as a successor for the popular DVB-S system. It was developed in 2003 by the DVB Project, an international industry consortium, and ratified by ETSI (EN 302307) in March 2005. The standard is based on, and improves upon DVB-S and the electronic news-gathering (or Digital Satellite News Gathering) system, used by mobile units for sending sounds and images from remote locations world-wide back to their home television stations.
DVB-S2 is envisaged (contemplate) for broadcast services including standard and HDTV, interactive services including Internet access, and (professional) data content distribution. The development of DVB-S2 coincided with the introduction of HDTV and H.264 (MPEG-4 AVC) video codecs.
Two new key features that were added compared to the DVB-S standard are:
- A powerful coding scheme based on a modern LDPC code. For low encoding complexity, the LDPC codes chosen have a special structure, also known as Irregular Repeat-Accumulate codes.
- VCM (Variable Coding and Modulation) and ACM (Adaptive Coding and Modulation) modes, which allow optimizing bandwidth utilization by dynamically changing transmission parameters.
Other features include enhanced modulation schemes up to 32APSK, additional code rates, and the introduction of a generic transport mechanism for IP packet data including MPEG-4 audio–video streams, while supporting backward compatibility with existing MPEG-2 TS based transmission.
DVB-S2 achieves a significantly better performance than its predecessors – mainly allowing for an increase of available bitrate over the same satellite transponder bandwidth. The measured DVB-S2 performance gain over DVB-S is around 30% at the same satellite transponder bandwidth and emitted signal power. When the contribution of improvements in video compression is added, an (MPEG-4 AVC) HDTV service can now be delivered in the same bandwidth that supported an early DVB-S based MPEG-2 SDTV service only a decade before.
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Projects with this TAG (4)
Satellite transmissions beyond S2X
The DVB is currently starting a Commercial Study Mission casting DVB’s Vision for Satellite Broadcasting, looking at the near- and long term, and going beyond classic geostationary satellite constellations, anticipating a successful bringing into use of future low earth orbiting payloads.
Rai-CRIT will participate in these activities, according to its leaderschip role and active participation in the DVB technical module dedicated to satellite transmissions, aiming at evaluating opportunities, times and methods for new standardisation activities.
DVB-S2X - the DVB-S2 extension for the future of satellite communications
First 4k HEVC satellite transmission using DVB-S2X from Turin
Born as an extension of second generation satellite broadcast standard DVB-S2, the DVB-S2X offers new configurations that provide improved performance in S2 scenarios (DTH, broadband and interactivity, DSNG, and professional applications, contribution and distribution TV), and extends the operating modes to cover new emerging segments such as mobile reception (airplanes, trains, ships, etc.). The new system, based on the excellent technologies of DVB-S2, introduces innovative elements at the modulation, resulting in a more extensive and granular operating range in terms of signal-to-noise ratio, as well as an increased spectral efficiency thanks to new modulation schemes and spectrum roll-off values. With the DVB-S2X the “channel bonding” is now introduced: 2 or 3 transponder can be used simultaneously, in order to transmit very high capacity streams, enabling the broadcast of UHD bouquets.
The first satellite transmission of a HEVC encoded UHD-4k bouquet, using the new broadcasting standard DVB-S2X, has been carried out on 2014 at the Centre for Research and Technological Innovation Rai in Turin.
New DVB technology to serve satellite customers and to feed terrestrial transmitters
Today, the satellite distribution of DVB-T2 multiplexes to terrestrial transmitters located throughout the territory requires dedicated transponders for the transport of the relevant T2-MI (Modulator Interface) streams, which are not directly accessible also for direct-to-home reception by standard satellite receivers. This causes duplication of the needed satellite bandwidth, with the associated costs. To overcome this problem, DVB (Digital Video Broadcasting) has activated a new ad-hoc group, named TM-T-JSI, with the purpose of defining an optimized way to transport DVB-T/T2 multiplexes from a national head-end to the terrestrial transmitters, while allowing at the same time direct reception via DVB-S/S2 commercial satellite receivers.
ESA SCORSESE Project
Satellite supporting CDNs for the distribution of OTT services
The integration of terrestrial and satellite telecommunication networks will allow the widespread distribution of OTT contents, offloading the CDN backbone during traffic peaks, for the benefit of the effective picture quality perceived by the users.