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Description
Operation of the DPC algorithm is controlled by the parameters shown in
table C-1, below.
Parameter
Nominal Power
Level
Calibrated Data
Rate
Maximum Power
Level
Minimum Power
Level
BaseLine Power
Level
DPC Offset
SOTM Offset
Target Eb/No
Target Range
Speed Up
Eb/No
Target DPC
Address
The start point for all enabled modulators is the Nominal Power Level. This
level is measured during initial system turn-up and is the power level at which
all modems will initially transmit when a call is established. Once communica-
A p p e n d i x
D y n a m i c P o w e r C o n t r o l
C -
Table C-1
Dynamic Power Control Parameters
Default
-25 (IF)
Power used for scaling Maximum power after
-40 (L-Band)
switching
dBm
System
Data Rate which is used for scaling Maximum power
Specific
after switching
System
Maximum transmit power level permitted based on
Specific
link/satellite parameters
System
Minimum transmit power level permitted based on
Specific
link/satellite parameters
-25 (IF)
Function of the power given to the modem by the
-40 (L-Band)
VMS for the last switch command based on link
dBm
budget calculations
0 dB
Power adjustment to account for changes in the
environment (rain fade) or other factors in order to
maintain link connectivity
0 dB
Power adjustment received from ROSS based on
current location of modem within the satellite
footprint
10 dB
Target E
0.2 dB
Target range for no power adjustment; No adjustment
occurs when power is within this range
5 dB
DPC and PLDM process speeded up from default (1/
min) if E
0.0.0.0
Identifies the modem that is transmitting to this
device and will receive Eb/No values
Significance
/N
value for which DPC is aiming
b
o
/N
is below this amount
b
o
Description
C-3
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