DVB-SH

DVB-SH ("Digital Video Broadcasting - Satellite services to Handhelds") is a physical layer standard for delivering IP based media content and data to handheld terminals such as mobile phones or PDAs, based on a hybrid satellite/terrestrial downlink and for example a GPRS uplink. The DVB Project published the DVB-SH standard in February 2007.[1]

The DVB-SH system was designed for frequencies below 3 GHz, supporting UHF band, L Band or S-band. It complements and improves the existing DVB-H physical layer standard. Like its sister specification (DVB-H), it is based on DVB IP Datacast (IPDC) delivery, electronic service guides and service purchase and protection standards.

DVB-SH specifies two operational modes:

  • SH-A: specifies the use of COFDM modulation on both satellite and terrestrial links with the possibility of running both links in SFN mode.
  • SH-B: uses Time-Division Multiplexing (TDM) on the satellite link and COFDM on the terrestrial link.

Comparison with DVB-H

DVB-SH supported spectrum

The DVB-SH incorporates a number of enhancements when compared to DVB-H:

  • More alternative coding rates are available
  • The omission of the 64QAM modulation scheme
  • The inclusion of support for 1.7 MHz bandwidth and 1k FFT
  • FEC using Turbo coding
  • Improved time interleaving
  • Support for antenna diversity in terminals

Recently[when?], results from BMCO forum[Alcatel April 2008) shows a radio improvement of at least 5.5 dB on signal requirements between DVB-H and DVB-SH in the UHF frequencies. The improvements to signal requirements translates to better in-building penetration, better in-car coverage and extension of outdoor coverage. DVB-SH chipsets are being developed now by DiBcom and NXP Semiconductors, and are expected to be available in beginning of 2008. Initial specifications show that the chipsets supports both UHF and S-Band and are compatible with DVB-H.

Dibcom DVB-SH 2008 Q3. The chip "has dual RF tuners supporting VHF, UHF, L-Band and S-Band frequencies".

Other Languages
català: DVB-SH
Deutsch: DVB-SH
español: DVB-SH
français: DVB-SH
polski: DVB-SH
русский: DVB-SH