Newtec Proprietary
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R3.2_v1.0
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Feature Descriptions
MDM9000 Satellite Modem
16.8 Automatic Uplink Power Control
Automated uplink power control (AUPC) allows to regulate the power level in a point to point link.
The goal is to compensate for uplink fading events and keep a constant power level at the same
satellite input.
Downlink fading is not intentionally compensated and is separated from uplink fading.
16.8.1 AUPC Link Requirements
Uplink power control is a technique suitable to compensate uplink fading for uplink noise limited links
(for example with a smaller uplink antenna and a significantly higher downlink signal to noise ratio,
such as can be found in return channels with relatively small antennas in VSAT or trunking networks
and a big antenna in the hub).
The AUPC mechanism uses the power as well as the signal-to-noise ratio measurements on the
remote side to regulate the transmit power.
No external signal is required for the AUPC mechanism.
• Uplink noise limited link is a requirement for the AUPC mechanism.
The overall C/N of the link is largely determined by the C/N of the uplink as it is low compared to
the larger C/N in the downlink (usually due to the large antenna of the hub system). A change in
uplink C/N will have a profound effect on the overall C/N of the link.
• In systems that are downlink noise limited, AUPC is not recommended. This because a variation
of C/N in the uplink does hardly have an effect on the overall C/N since it is "dominated" by the
low C/N that is achievable in the downlink.
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