Digital Signal Processing Reference
In-Depth Information
•
Robustness-mode-signalling
In DRM it is possible to chose, apart from "simple modulation“ (SM),
also "hierarchical modulation“ (HM), similar to DVB-T. Different levels
of error protection can then be used on the two paths of the hierarchical
modulation.
Transmission
super frame
Symbols containing MSC cells only
Transmission
frame
SDC block
Symbols containing MSC and FAC cells
Fig. 30.4.
Frame structure in DRM
30.4 Frame structure
Like other transmission standards such as DVB-T or DAB, DRM, too, has
a frame structure (Fig. 30.4.) for arranging the COFDM symbols which is
organized as follows:
•
a certain number of COFDM symbols N
s
results in an COFDM-
transmission frame
•
3 transmission frames produce one transmission superframe
An COFDM frame, in turn, is composed of:
•
Pilot cells
•
Control cells (FAC, SDC)
•
Data cells (MSC)
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