Digital Signal Processing Reference
In-Depth Information
The modulation methods that can be selected on the 3744 data carriers
are:
•
64QAM
•
32QAM
•
16QAM
•
4QAM
•
4QAM-NR (Nordstrom Robinson)
The forward error correction consists of (Fig. 28.2.):
•
Scrambler
•
BCH coder
•
LDPC coder
•
Time interleaver
The DMB-T signal structure consists of
•
Signal Frame (Frame Header + Frame Body = Guard + Symbol)
•
Super Frame = N
1
• Signal Frame
•
Minute Frame = N
2
• Super Frame
•
Calendar Day Frame = N
3
• Minute Frame
As in other transmission methods, the input signal for a DMB-T trans-
mitter is the MPEG-2 transport stream.
Fig. 28.4.
DMB-T spectrum
Search WWH ::
Custom Search