ND SatCom SKYWAN IDU 7000, Manual

Page: 106 / 154

102 Network Design and Engineering Guide 2010-10-26
Outdoor Unit and Satellite Link Design
Link Budget Examples
For the stations as a first try we use 2.4m antennas on every site. Then the station parameters
are given by:
Figure 3-36 Scenarion 1 - 2 Carrier Solution Stations
Now we calculate the link budget under the constraint that the power requirement for every site
should not exceed 30 W. That allows the use of following modulation and coding choices and
resulting bandwidths:
Table 3-6 Scenario 1 - Carrier Coding and Bandwidth
The power requirements for the individual earth stations can be summarized in following table:
Table 3-7 Scenario 1 - Summarized Power Requirements
Meshed Network Carrier 1 Carrier 2 Total bandwidth re-
quired ( carrier spac-
ing = 1.2) [KHz]
Modulation 8PSK QPSK
FEC 2/3 2/3
7096
Estimated Symbol
Rate [ksps] 2713 3200
Meshed Network Madrid Berlin Rome Casablanca Tunis
Home Channel 1 1 2 2 2
Power requirement [W] 9.5 6.6 9.3 25.2 12.8
Amplifier power class [W] 20 8 20 30 20
Power equivalent band-
width [kHz]
with UPC (Home Channel) 1064 983 552 1125 542
Carrier bandwidth [kHz]
(Home Channel) 3256 3256 3840 3840 3840