Symmetric Data Rate Link - Radyne DMD20 Installation And Operation Manual

DMD20/20LBST Universal Satellite Modem
3.15.8.1

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 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
MN-DMD20-20LBST Revision 14
Galaxy 18 @ 123º W, 13K/13K
Phoenix, AZ – 4.6 m
Phoenix, AZ – 2.4 m
512 kbps / 512 kbps
Theory of Operation
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