Standardized DVB-T2 RF specifications - DigitalEurope

Figure 2 - Tolerance to a single echo with Doppler
Table 15 – C/N Variation Requirements for Time Varying Channel (PFP1)
Mode Frequency
Separation
f1 Hz
Δ C/N dB (with
respect to C/N at
1Hz frequency
separation)
5 – 32KN 256Q 3/5 1/32 PP4 8MHz 10 3 dB
6 – 32KN 256Q 3/5 1/8 PP2 7MHz 10 3 dB
7 – 32KE 256Q 2/3 1/128 PP7 8MHz 10 3 dB
8 – 32KE 256Q 2/3 1/16 PP4 8MHz 10 3 dB
9 – 32KE 256Q 3/4 1/32 PP6 8MHz 10 5 dB
12- TOLERANCE TO IMPULSE INTERFERENCE
12- 1- General
C/Nmin + � dB
C/Nmin
C/Nmin (dB)
Impulse interference is different from other forms of interference, in that it is generated in
short bursts. Sources include car ignition systems and domestic appliances such as switches
and electric motors. In portable and mobile environment, the impulse interference will reach
the receiver directly through the antenna. The damage is potentially serious because a single
impulse burst can destroy several symbols of data. Research work on the impulse
interference has been mainly carried out in the UK digital television group (DTG) (ref 2).
Some of the specifications presented here are derived from that work.
12- 2- Test patterns
C/N (dB)
1 f1
Frequency
Separation (Hz)
Various test signals comprising gated bursts of Gaussian noise are defined based on the
model shown in Figure 3. These have been chosen to match different categories of
measured impulse noise in the domestic environment such as dishwashers, lights, and
central heating thermostats. The DVB-T2 time interleaver improves impulse noise immunity
significantly over DVB-T by breaking up the noise impulses over time. This requires longer
noise burst durations, burst repetition periods and picture observation times (PFP2) to be
used compared with DVB-T as shown in Table 16.
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