At the 71st meeting of the steering board of the Digital Video Broadcasting (DVB) international industry-led consortium, approval was given for an update of the DVB-Satellite 2 (DVB-S2) standard for use with wideband transponders. The update will allow efficient use of wideband transponders which are now becoming available.
A new annex addresses the use of DVB-S2 over satellite transponders, which are no longer 30 to 80 MHz wide but may have a bandwidth of several hundred MHz. In principle it would be possible to allocate several narrower channels inside the wideband transponders, but this would require the operation of the satellite transponder with reduced downlink power and therefore at a lower data rate. It would also be possible to develop satellite receivers that receive the complete wideband signal resulting in a very high data rate. Consequently the complexity of the receiver would be high.
Therefore, a time-slicing concept has been adopted for the new extension where the receiver only processes its dedicated time-slice data. This approach significantly reduces the complexity for the receiver device, such as, satellite modems for internet via satellite and other professional services. Time slicing requires signalling and this is also covered in the new annex of the DVB-S2 specification.
In addition, the steering board agreed that DVB will start working on DVB-S2 extensions supporting the more efficient use of satellite transponders. DVB-S2 will continue to be the standard for direct-to-home satellite services whereas these updates will benefit the specification by optimising it for contribution and other high-speed data rate services. The extensions take advantage of technical solutions that are available for implementing, e.g., lower roll-off factors with suppression of adjacent satellite carrier interference, and other existing methodologies for filter optimisation of satellite channels. These improvements are designed to increase spectral efficiency. Steering Boards Approves Update Of DVB-S2 For Use With Wideband Transponders 2
A new version of the DVB-S2 BlueBook as well as the corresponding ETSI European Norm (EN 302 307) is to be published to include the new time slicing technology for wideband transponders. For more information log on to www.dvb.org