DVB-S2

Digital Video Broadcasting - Satellite - Second Generation (DVB-S2) is a <a href="/facts/Digital_television/KQCyILQa">digital television</a> broadcast standard that has been designed as a successor for the popular <a href="/facts/DVB-S/5IM9wfeu">DVB-S</a> system. It was developed in 2003 by the <a href="/facts/Digital_Video_Broadcasting/KPGNTGBJ">Digital Video Broadcasting</a> Project, an international industry consortium, and ratified by <a href="/facts/ETSI/8rJbbhPg">ETSI</a> (EN 302307) in March 2005. The standard is based on, and improves upon DVB-S and the <a href="/facts/Electronic_news-gathering/j1udUbJB">electronic news-gathering</a> (or Digital Satellite News Gathering) system, used by mobile units for sending sounds and images from remote locations worldwide back to their home television stations.
DVB-S2 is designed for broadcast services including <a href="/facts/Standard-definition_television/dvqEXg2A">standard</a> and <a href="/facts/High-definition_television/AuE6FRFI">HDTV</a>, <a href="/facts/Return_Channel_Satellite/cXpe0qVl">interactive</a> services including Internet access, and (professional) data content distribution. The development of DVB-S2 coincided with the introduction of HDTV and <a href="/facts/H.264%2fMPEG-4_AVC/soCzKcmJ">H.264</a> (MPEG-4 AVC) <a href="/facts/Video_codec/psfSuqg7">video codecs</a>.
Two new key features that were added compared to the DVB-S standard are:

<ul><li>A powerful <a href="/facts/Forward_error_correction/cLUTUJrA">coding</a> scheme based on a modern <a href="/facts/Low-density_parity-check_code/yPYHEKAP">LDPC code</a>. For low encoding complexity, the LDPC codes chosen have a special structure, also known as Irregular Repeat-Accumulate codes.</li>
<li>VCM (Variable Coding and Modulation) and ACM (Adaptive Coding and Modulation) modes, which allow optimizing bandwidth utilization by dynamically changing transmission parameters.</li></ul>
Other features include enhanced <a href="/facts/Modulation/aAXPjINv">modulation</a> schemes up to <a href="/facts/Amplitude_and_phase-shift_keying/moXM9HMB">32APSK</a>, additional <a href="/facts/Code_rate/xPrLLTwt">code rates</a>, and the introduction of a <a href="/facts/Generic_Stream/5xhs6Pd3">generic transport mechanism</a> for IP packet data including <a href="/facts/MPEG-4/6svV1w2H">MPEG-4</a> audio–video streams, while supporting backward compatibility with existing <a href="/facts/MPEG_Transport_Stream/2wBLnyeD">MPEG-2 TS</a> based transmission.
DVB-S2 achieves <a href="/facts/Spectral_efficiency/GaePAvv9">significantly better performance</a> 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 <a href="/facts/Video_compression/gMFuY4FT">video compression</a> is added, an (<a href="/facts/MPEG-4_AVC/soCzKcmJ">MPEG-4 AVC</a>) <a href="/facts/HDTV/AuE6FRFI">HDTV</a> service can now be delivered in the same bandwidth that supported an early DVB-S based MPEG-2 <a href="/facts/SDTV/dvqEXg2A">SDTV</a> service only a decade before.
In March 2014, <a href="/facts/DVB-S2X/s2KRglx0">DVB-S2X</a> specification has been published by DVB Project as an optional extension adding further improvements.

DVB-S2 open-in-new

DVB-S2