General overview of DVB-T2 Lite


DVB-T2 Lite tutorial

 

The  DVB T2-lite profile was added in June 2011 to the DVB-T2 standard  v1.3.1 as Annex I. 

The T2-Lite profile is mostly a subset of the DVB-T2 standard which is called now "DVB T2-base" profile. 

Two additional code rates were added for improvement of mobile performance.

 

DVB-T2 Lite

FEC block size LDPC 16k only
Code rate 1/2, 3/5, 2/3, 3/4, 2/5,1/3
Constellation QPSK, 16QAM, 64QAM, 256QAM (up to code rate 3/5)
Rotated Constellation Only for QPSK, 16QAM and 64QAM
Guard Interval reduced set of combinaisons of FFT size, guard interval and pilot pattern.
FFT size 2K, 4K, 8K, 16K, 16K ext.
Scattered pilots PP8 not allowed
Max. Bandwidth 4 Mb/s
P1 Signalling new signalling for T2-mobile SISO/MISO
L1 Scrambling optional scrambling of L1-post only or entire L1

The T2-Lite signal may either be transmitted as a stand-alone signal ie. in a regular PLP, or as a T2-Lite signal with FEF parts.

 

The Future Extension Frame (FEF) carry a T2 Frame dedicated for mobile services and may have different modulation parameters (FFT size, Guard Interval, SFN/MISO, Pilot pattern) than the other T2 Frame to improve mobile reception.  The FEF interval and size of the T2-Lite super frame can be defined in the T2Gateway. The maximum duration of a FEF part is 1 second.

super frame

In March 2012 the  DVB-T2 Validation and Verification (V&V) task force, coordinated by the Technical Module TM-T2 working group, has organized the first  plug fest dedicated to the validation and the verification of the T2-Lite profile of the DVB-T2 standard.

This plugfest was the opportunity for some manufacturers to perform interoperability testing of T2Gateway, modulator and receiver implementations using advanced DVB-T2-Lite profile.