DVB-S, S2, S2x Modulator

Introduction:

DVB-S2 (EN 302 307) is a digital satellite transmission system developed by the DVB Project. It makes use of the recent modulation and coding techniques to deliver performance that approaches the theoretical limit for such systems. Satellite transmission was the first area addressed by the DVB Project in 1993 and DVB standards form the basis of most satellite DTV services around the world today, and therefore of most digital TV in general. 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-S2X represents an evolution and refinement of the DVB-S2 standard rather than a fundamental step change in the technology. The changes presented in DVB-S2X offer significant advances and opportunities, to service providers, particularly in the areas of:

• New generation DTH (Direct to Home) broadcast services e.g. VCM (Variable Coding and Modulation) with simulcasting or channel bonding in support of UHDTV (Ultra high definitionTV).

• Broadband services (e.g. multi-beam hopping applications supported by new super-framing structure)

• Professional services (e.g. finer MODCOD granularity offering more flexible SNR (Signal to Noise ration) usage and VL(Very low)SNR applications.

For legacy (single beam) broadband networks, DVB-S2X fine-tunes both the physical and the upper protocol layers of DVB-S2. However, the best expected performance gains are foreseen for future multi-spot beam systems especially in the Ka-band multi-spot environment and HTS (High Throughput Satellites), where aggressive spectrum re-use schemes together with advanced interference mitigation techniques can significantly boost the capacity (up to 100%) when compared to more conventional systems. This is made possible due to the new super-framing structure presented in DVB-S2X.

DVB-S/S2/S2x Modulator:

Fully complies with DVB-S2 (EN302307) modulation standard.

Backwards-compatible with DVB-S (EN300421) modulation standard.

ASI inputs supporting automatic switch over in case of signal loss.

Supports BISS scrambling modes: 0, 1 & E.

Supports local and remote control.

10MHz outer reference clock input.

Output frequency range: 950 to 2150MHz (L band).

ACM (Adaptive coding and modulation).

Smaller (in transponder) roll off factors to 5%, giving higher spectral efficiency.