Operational References; Carrier-In-Carrier Link Budget Calculation - Comtech EF Data DMD-2050E Installation And Operation Manual

DMD2050E Universal Satellite Modem

3.11.12 Operational References

3.11.12.1
The following steps are required for calculating the link budget for a Carrier-in-Carrier Link:
Step Procedure
1 Calculate the link budget for both carriers in the duplex link, with required CnC margin:
2 Verify that the PDS ration is within spec for the DMD2050E
3 Calculate the Allocated Bandwidth (BW) and Power Equivalent Bandwidth (PEB) for the duplex link:
BW
Duplex Link
PEB
Leased BW
4 For an optimal link, the Leased Bandwidth and the Power Equivalent Bandwidth should be equal / nearly
equal.
5 Repeat the link budget process by selecting different Modulation and FEC, until the BW and PEB is nearly
balanced.
MN-DMD2050E Revision 2

Carrier-in-Carrier Link Budget Calculation

= Greater of (BW
= PEB + PEB
Duplex Link Carrier 1
= Greater of (BW
Duplex Link
Find the Eb/No corresponding
to the desired BER
Add CnC Margin
Add any other margin
Use this compiled value as
the Threshold Eb/No for the
link budget
, BW )
Carrier 1 Carrier 2
Carrier 2
, PEB
Duplex Link Duplex Link
Theory of Operation
)
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