Digital Signal Processing Reference
In-Depth Information
Table 30.3.
Number of DRM carrier per COFDM symbol (K
min
= lowest carrier
no., K
max
= highest carrier no., K
unused
= unused carrier numbers, SO = spectrum
occupancy)
Robust-
ness
mode
Carrier
SO 0
4.5
kHz
SO 1
5 kHz
SO 2
9 kHz
SO 3
10 kHz
SO 4
18 kHz
SO 5
20 kHz
A
K
min
2
2
-102
-114
-98
-110
A
K
max
102
114
102
114
314
350
A
K
unused
-1,0,1
-1,0,1
-1,0,1
-1,0,1
-1,0,1
-1,0,1
B
K
min
1
1
-91
-103
-87
-99
B
K
max
91
103
91
103
279
311
B
K
unsed
0
0
0
0
0
0
C
K
min
-
-
-
-69
-
-67
C
K
max
-
-
-
69
-
213
C
K
unused
-
-
-
0
-
0
D
K
min
-
-
-
-44
-
-43
D
K
max
-
-
-
44
-
135
D
K
unused
-
-
-
0
-
0
Fig. 30.1. shows the block diagram of a DRM modulator. Up to 4 ser-
vices (audio or data) can be combined to form one DRM multiplex and to
be transmitted in the so-called MSC (Main Service Channel). A DRM sig-
nal contains the following subchannels:
•
the MSC = Main Service Channel (16QAM/64QAM modulation)
•
the FAC = Fast Information Channel (QPSK)
•
the SDC = Service Description Channel (QPSK/16QAM)
The FAC is used for signalling the following information to the re-
ceiver:
•
Robustness mode
•
Spectrum occupancy
•
Interleaving depth
•
MSC mode (16QAM/64QAM)
•
SDC mode (QPSK/16QAM)
•
Number of services
The SDC is used for transmitting information such as
•
Protection level of the MSC
•
Stream description
Search WWH ::
Custom Search