Radyne DMD20 Installation And Operation Manual page 43

DMD20 Universal Satellite Modem
Figure 3-16. Reed-Solomon Encoder Functional Block Diagram
Figure 3-17. Reed-Solomon Decoder Functional Block Diagram
Type of Data Rate
Service (Kbps)
Small IDR 64
(With 16/15
128
O/H)
256
384
512
768
1024
1536
IDR 1544
(With 96
2048
Kbps O/H)
6312
8448
8PSK 1544
2048
6312
8448
Notes:
1. n = code length, k = information symbols and t = symbol error correcting capability.
2. Design objective.
TM103 – Rev. 1.1
Table 3-1. Reed-Solomon Codes for IDR
R-S Code
1
(n, k, t)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(126, 112, 7)
(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)
Bandwidth Interleaving
Expansion Depth
[ (n/k) -1 ]
0.125 4
0.125 4
0.125 4
0.125 4
0.125 4
0.125 4
0.125 4
0.125 4
0.0976 4
0.0896 4
0.0899 4
0.0899 4
0.0896 8
0.0896 8
0.0896 8
0.0896 8
Theory of Operation
2
Maximum
R-S Codec
Delay (ms)
115
58
29
19
15
10
8
5
9
7
2
<2
18
13
4
3
3-21