Dmd20 Automatic Uplink Power Control (Aupc Operation) - Radyne DMD20 Installation And Operation Manual

Theory of Operation
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
DVB All
1. n = code length, k = information symbols and t = symbol error correcting capability.
2. Design objective.

3.15 DMD20 Automatic Uplink Power Control (AUPC Operation)

The DMD20 Modem has an optional built-in provision for Automatic Uplink Power Control
(AUPC). AUPC attempts to maintain a constant E
especially useful when operating over a satellite at Ku-Band Frequencies in locations with high
rainfall periods.
Implementing Strap Code 26 can set the following modem configuration.
Refer to Table 4-4 for an explanation and tabular listing of available Strap
Codes. The Frequency and Modulator Output Power are set
independently of the strap code.
3-22
DMD20/DMD20 LBST Universal Satellite Modem
Table 3-1. Reed-Solomon Codes
R-S Code Bandwidth
1
(n, k, t) Expansion
[ (n/k) -1 ]
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(126, 112, 7) 0.125
(225, 205,10) 0.0976
(219, 201, 9) 0.0896
(194, 178, 8) 0.0899
(194, 178, 8) 0.0899
(219, 201, 9) 0.0896
(219, 201, 9) 0.0896
(219, 201, 9) 0.0896
(219, 201, 9) 0.0896
(204, 188, 8) 0.0851
/N
b o
Interleaving
Depth
4
4
4
4
4
4
4
4
4
4
4
4
8
8
8
8
12
at the receive end of an SCPC link. This is
2
Maximum
R-S Codec
Delay (ms)
115
58
29
19
15
10
8
5
9
7
2
<2
18
13
4
3
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TM103 - Rev. 2.5