Considerations For Skywan ® Link Budget Calculations; Network Topology; Figure 3-8 Power Conditions With Uplink Power Control - ND SatCom SKYWAN IDU 7000 Manual

Outdoor Unit and Satellite Link Design
Considerations for SkyWAN
Figure 3-8 Power Conditions with Uplink Power Control
Note that a further reduction to the minimum power requirement for clear sky conditions X
possible but unnecessary.
This functionality is generally called "Uplink Power Control (UPC)" and is implemented in Sky-
®
WAN networks as the built-in automatic Transmission Power Control (TPC). Generally the
power requirement for the satellite transponder including rain margin is given by:
With UPC: EIRP
Without UPC: EIRP
Note that the power requirement for the transmitting earth station is not affected by UPC, but
is always given by:
EIRP
3.4 Considerations for SkyWAN
lations
3.4.1

Network Topology

So far we have considered satellite links which include a transmitting and a receiving earth sta-
tion using a specific satellite transponder. Most widely used link budget tools actually are de-
signed for such point-to-point links, where each station uses a dedicated carrier to reach
another station. In SkyWAN
specific points:
®
- A SkyWAN station in a meshed network communicates not only with one remote station
but with up to 509 remote stations.
®
- A SkyWAN carrier is typically not only used by a single station but by a whole group of
stations.
®
- A SkyWAN station may use not only one carrier but different carriers which may be locat-
ed on different transponders on a satellite.
To calculate the power requirement for a SkyWAN
82
®
Link Budget Calculations
= EIRP + Downlink rain fade
S S,clear Sky
= EIRP + Downlink rain fade + Uplink rain fade
S S,clear Sky
= EIRP + Downlink rain fade + Uplink rain fade
T T,clear Sky
®
networks however, we have to take into account the following
Network Design and Engineering Guide
®
Link Budget Calcu-
®
earth station, the individual power require-
is
T
2010-10-26