SSH EN 302 583 V1.1.1:2008

Digital Video Broadcasting (DVB); Framing Structure, channel coding and modulation for Satellite Services to Handheld devices (SH) below 3 GHz

Scope

The present document specifies a transmission system for hybrid satellite and terrestrial digital television broadcasting
to mobile terminals. It is derived from the DVB-T [1] and DVB-H [6] system specification, respectively designed for
digital television terrestrial broadcasting towards fixed and mobile terminals and DVB-S2, [2] designed for digital
satellite broadcasting towards fixed terminals. The purpose of the DVB-SH standard is to provide an efficient
transmission system using frequencies below 3 GHz suitable for Satellite Services to Handheld devices, in terms of
reception threshold and resistance to mobile satellite channel impairments.
The system relies on a hybrid satellite/terrestrial infrastructure. The signals are broadcast to mobile terminals on two
paths:
• A direct path from a broadcast station to the terminals via the satellite.
• An indirect path from a broadcast station to terminals via terrestrial repeaters that form the Complementary
Ground Component (CGC) to the satellite. The CGC can be fed through satellite and/or terrestrial distribution
networks.
The system includes two transmission modes:
• An OFDM mode based on DVB-T standard [1] with enhancements. This mode can be used on both the direct
and indirect paths; the two signals are combined in the receiver to strengthen the reception in a SFN
configuration.
• A TDM mode partly derived from DVB-S2 standard [2], in order to optimize transmission through satellite
towards mobile terminals. This mode is used on the direct path only. The system supports code diversity
recombination between satellite TDM and terrestrial OFDM modes so as to increase the robustness of the
transmission in relevant areas (mainly suburban).
The present document specifies the digital signal format and the digital signal modulation and coding in order to allow
compatibility between pieces of equipment developed by different manufacturers. Signal processing at the modulator
side is described in details, while processing at receiver side is left open to a particular implementation (as far as it
complies with the present document).