DVB-S2 (EN302 307) is a digital satellite transmission system developed by the DVB Project. It makes use of the latest modulation and coding techniques to deliver performance that approaches the theorectical limit for such systems.DVB-S2 will gradually replace DVB-S in the future, as new HD services entice users to upgrade their receivers to more efficient DVB-S2 models. DVB-S2 takes advantage of advanced techniques for channel coding, modulation and error correction to create a system that would make a range of new services commercially viable for the first time eg when combined with the latest video compression technology, DVB-S2 would enable the widespread commercial launch of HDTV services.
How does it work?
The original DVB-S system, on which DVB-S2 is based , specifies the use of QPSK modulation along with various tools for channel coding and error correction. DVB-S2 benefits from more recent developments and has the following key technical characteristics:
DVB-S2 delivers excellent performance, coming close to the Shannon limit, the theorectical maximum information transfer rate in a channel for a given noise level. It can operate at carrier-to-noise ratios from -2dB ( below the noise floor) with QPSK through to +16dB using 32AAPSK. Improvements in efficiecy that DVB-S2 delivers compared to DVB-S shows gains in the useful bitrate of more than 30% in each case.