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DMD50 Universal Satellite Modem
3.14.9.1
Symmetric Data Rate Link
Consider the following example:
Satellite & Transponder
Earth Station 1
Earth Station 2
Data Rate
The traditional link was based on QPSK TPC 3/4 and required 0.96 MHz of leased BW. The
1
LST
summary for the traditional link is as follows:
Carrier-in-Carrier link design involved trying different Modulation & FEC Code Rates to find the
optimal combination:
•
8-QAM, LDPC 2/3 with Carrier-in-Carrier
•
QPSK, LDPC 3/4 with Carrier-in-Carrier
•
QPSK, LDPC 2/3 with Carrier-in-Carrier
•
QPSK, LDPC 1/2 with Carrier-in-Carrier
1
LST is Intelsat's Lease Transmission Plan Program.
MN-DMD50 Revision 4
Galaxy 18 @ 123º W, 13K/13K
Phoenix, AZ – 4.6 m
Phoenix, AZ – 2.4 m
512 kbps / 512 kbps
Theory of Operation
3–29
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