Transmission - 3DTV: Processing and Transmission of 3D Video Signals - page 102

Table 4.1 DVB-T vs DVB-T2

DVB-T DVB-T2 DVB-T DVB-T2

(MFN) (MFN) (SFN) (SFN)

Modulation 64QAM 256QAM 64QAM 256QAM

FFT size 8K 32K 8K 32K

Guard Interval 1/32 1/128 1/4 1/16

Bandwidth Standard Extended Standard Extended

Required C/N 16.5 dB 16.1 dB 16.5 dB 16.1 dB

Capacity 24.1 Mbit/s 36.1 Mbit/s 19.9 Mbit/s 34.3 Mbit/s

(gain = 50%) (gain = 70%)

and TV sets have been available in the UK market immediately after the
deployment of the Freeview HD DVB-T2 network. The possibility increasing
the capacity in a digital terrestrial television (DTT) multiplex is one of the key
benefits of the DVB-T2 standard. In comparison to the current digital terres-
trial television standard, DVB-T, this second-generation standard provides
a minimum increase in capacity of more than 30% in equivalent reception
conditions using existing receiving antennas. Lab tests carried out at Rai
CRIT indicate that the increase in capacity obtained in practice may be closer
to 50% for MFN and close to 70% for SFN.
As an example of the typical configuration for an MFN network Table 4.1
confirms that 4 HD programmes can be allocated in the 8MHz bandwidth
where 4 - 5 SD programmes are allocated with first generation DVB-T stan-
dard. In Table 4.2 the typical Modcod schemes adopted by broadcasters for
fixed reception with roof-top antenna are listed, together with the bandwidth
capacity and the required C/N.
DVB-T2 system encompasses a lot of modulation and coding options and
many other options to choose from, for maximum flexibility. In this scenario
only the modulation schemes that approach the same C/N of the DVB-T (i.e.
the same coverage) are listed in Table 4.3.

Table 4.2 DVB-T capacity and required C/N

Modcod Bit-rate Gaussian channel Network

[Mbit/s] C/N [dB]

64QAM, rate 2/3, GI 1/32, 8k 24.1 16.5 MFN

64QAM, rate 3/4, GI 1/32, 8k 27.1 18.0 MFN

64QAM, rate 5/6, GI 1/32, 8k 30.2 19.3 MFN

64QAM, rate 2/3, GI 1/4, 8k 19.9 16.5 SFN

64QAM, rate 3/4, GI 1/4, 8k 22.4 18.0 SFN

64QAM, rate 5/6, GI 1/4, 8k 24.9 19.3 SFN