Table of Contents
Advertisement
DMD50 Universal Satellite Modem
Figure 3-8. Reed-Solomon Encoder Functional Block Diagram
Figure 3-9. Reed-Solomon Decoder Functional Block Diagram
Data Rate
Type of Service
(Kbps)
Small IDR
(With 16/15
O/H)
1024
1536
1544
IDR
(With
2048
96 Kbps O/H)
6312
8448
1544
2048
8PSK
6312
8448
DVB
1. n = code length, k = information symbols and t = symbol error correcting capability.
MN-DMD50 Revision 4
Table 3-1. Reed-Solomon Codes
R-S Code
1
(n, k, t)
64
(126, 112, 7)
128
(126, 112, 7)
256
(126, 112, 7)
384
(126, 112, 7)
512
(126, 112, 7)
768
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(225,
205,10)
(219, 201, 9)
(194, 178, 8)
(194, 178, 8)
(219, 201, 9)
(219, 201, 9)
(219, 201, 9)
(219, 201, 9)
All
(204, 188, 8)
2. Design objective.
Bandwidth
Expansion [ (n/k) -
1 ]
0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.125
0.0976
0.0896
0.0899
0.0899
0.0896
0.0896
0.0896
0.0896
0.0851
Theory of Operation
Interleaving
Maximum
Depth
Codec Delay (ms)
4
4
4
4
4
4
4
4
4
4
4
4
8
8
8
8
12
2
R-S
115
58
29
19
15
10
8
5
9
7
2
<2
18
13
4
3
-
3–16
Advertisement
Table of Contents
