2022-05-31 | Technical improvements, changes in design, printing- and other errors reserved. | BA_MIE.pdf |
Page 39 of 68
Bandwidth
If CCIR is selected as the
Norm
, the bandwidth of the channels can be changed. With a larger
bandwidth, more data can be transmitted in one channel.
By adjusting the bandwidth, the channels no longer correspond to the channel grid specified by
the
Norm
.
Guard Interval
A guard interval is transmitted between the transmitted symbols of the useful signal. The guard
interval protects against inter-symbol interferences.
A very long guard interval (e.g. 1/4) leads to a very low data rate. A small guard interval is usually
sufficient for transmission in a coaxial distribution network.
Transmission Mode
The transmission mode can be set between 1k and 4k. 4k allows the shortest guard interval and
the highest data transmission.
FEC length
An FEC frame with 64k FEC length or a (short) one with 16k FEC length can be configured.
L1-Post Constellation
The L1 post signaling contains parameters that provide information to the receiver. Constellation
types BPSK, QPSK, QAM16 and QAM64 can be configured for L1 post signaling.
L1 pre-signalling is always BPSK modulated.
Pilot Pattern
Depending on the Guard Interval and the transmission mode, Pilot Pattern PP1 to PP8 can be
selected.
Fine Level
The level fine adjustment attenuates the output level of each individual modulator output
separately from 0 to -3 dB.
In addition, each modulator output can be disabled (Off option).
Fine Tune
The fine tuning of the output channel is performed in 0.5 MHz steps.
Note
Some configuration options are dependent on each other. In this case,
selectable values are highlighted in white, non-selectable values in
gray.
3.5.4.
MIE 3-02 and MIE 6-02 (DVB-T2)
Configuration of the modulators
Select a modulator from MODULATOR 1 to MODULATOR 3 on the left.
Select a
modulator
