DVB Approves DVB-SH Specification for Hybrid Satellite/Terrestrial Mobile Devices
February 22, 2007 // Published as a news service by IHS
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The Digital Video Broadcasting (DVB) Steering Board approved the DVB-SH (satellite services to handhelds) specification.
At the 53rd meeting of the DVB Steering Board, two documents specifying DVB-SH were approved: a waveform specification and a description of the system. The specification was developed by the DVB Technical Module's TM-SSP working group.
DVB-SH is defined as a system that is able to deliver Internet Protocol (IP) based media content and data to handheld terminals like mobile phones and personal digital assistants (PDAs) via satellite. Whenever a line of sight between terminal and satellite does not exist terrestrial gap fillers are employed to provide the missing coverage.
The DVB-SH system was designed for frequencies below 3 GHz, typically in the S-band. It complements the existing DVB-H (handheld) physical layer standard and like its sister specification (DVB-H) uses the DVB IP Datacast (IPDC) set of content delivery, electronic service guide and service purchase and protection standards.
DVB-SH includes features such as turbo coding for forward error correction and a highly flexible interleaver in an advanced system designed to cope with the hybrid satellite/terrestrial network topology, said the DVB Project.
Satellite transmission ensures wide area coverage, with a terrestrial component assuring coverage where the satellite signal cannot be received as may be the case in built-up areas.
DVB-SH specifies two operational modes. SH-A specifies the use of coded orthogonal frequency-division multiplexing (COFDM) on both satellite and terrestrial links with the possibility of running both links in single-frequency network (SFN) mode.
SH-B uses a time division multiplex (TDM) on satellite with COFDM on the terrestrial link. A comprehensive set of guidelines for the implementation of the standard will follow.
"DVB-SH enhances the range of DVB standards in the area of mobile digital television," said Peter MacAvock, executive director. "At a time when frequency availability is at a premium, it's important to ensure that those wishing to deploy mobile TV in the S-Band can benefit from DVB's proven record in producing successful open standards."
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The DVB-SH specifications will be published by the DVB Project and forwarded for formal standardisation at the European Telecommunications Standards Institute (ETSI) by its Joint Technical Committee Broadcast.
Source: Digital Video Broadcasting (DVB) Project.