Understand on DVB-H

DVB-H (Digital Video Broadcasting - Handheld) is a technical specification for bringing broadcast services to handheld receivers. DVB-H was formally adopted as ETSI standard EN 302 304 in November 2004. The DVB-H specification (EN 302 304) can be downloaded from the official DVB-H website. DVB-H is officially endorsed by the European Union. The major competitor of this technology is Digital Multimedia Broadcasting (DMB).

Technical explanation

DVB-SH (satellite services to handheld devices) is a hybrid (satellite/terrestrial) standard derived from DVB-H and ETSI SDR. A similar architecture is already being used in S-DMB, XM Satellite Radio, Sirius Satellite Radio, MobaHo! but DVB-SH promises to be more powerful. The envisaged system incorporates a high power geostationary satellite for outdoor and light indoor coverage integrated with a terrestrial repeater (low power gap-filler) network for indoor coverage in urban areas.

Thales Alenia Space expects to deliver DVB-SH terrestrial repeaters in 2007. Eutelsat and SES ASTRA plan to launch an S-band satellite covering Europe in 2009. DVB-SH satellite services will become operational in 2009 but maybe DVB-SH operations will start earlier with terrestrial networks in certain regions of the world. Chip maker DiBcom is designing a chipset that will be compatible with the DVB-H standard working in the S-Band, Sagem is developing DVB-H phones that support both UHF and S-Band. It's an official DVB Project standard. The DVB Technical Module launched a Study Mission on SSP (Satellite Services to Portable Devices) and in June 2006 TM-SSP started to develop standards. The DVB Project approved the definitive standard in February 2007.

French Agence de l'innovation industrielle is now financing this effort through TVMSL, a project led by Alcatel-Lucent that plans to develop a DVB-SH standard suitable for hybrid satellite and terrestrial transmission. Other partners involved in TVMSL are Sagem, Alenia, RFS, Philips, DiBcom, TeamCast, UDcast, CNRS, INRIA, CEA-LETI.

(Source: from wikipedia)