DTT parameters published by Ofcom
The UK regulator Ofcom has published a new set of reference parameters for the DTT platform, including those for the use of DVB-T2.
The document describes a reference system for DTT transmissions and specifies the minimum necessary to ensure that receivers can demodulate and decode all services.
In the DVB-T2 section two sets of OFDM carrier numbers are specified for normal mode or extended bandwidth mode. These are 27,265 for a bandwidth of 7.61 MHz and 27,841 for the 7.77 MHz extended bandwidth mode.
The modulation specified is 256 QAM with an outer coding of 2/3 and a guard interval of 1/128. The resulting carrier spacing is 279 Hz.
Source: Ofcom website
Item added: 23rd November 2009