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CDM-Qx Satellite Modem
Revision 6
Table of Contents
MN/CDMQx.IOM
Figure 6-1. Viterbi Decoding .....................................................................................................6–9
Figure 6-2. Viterbi with concatenated R-S Outer Code...........................................................6–10
Figure 6-3. 8-PSK/TCM Rate 2/3 with and without concatenated R-S Outer Code................6–11
Figure 6-4. Comtech EF Data Turbo Product Codec Rate 3/4 QPSK, 8-PSK and 16-QAM .....6–12
Figure 6-5. Comtech EF Data Turbo Product Codec Rate 7/8 QPSK, 8-PSK and 16-QAM .....6–13
Figure 6-6. Rate 1/2 QPSK, Rate 17/18 QPSK and Rate 17/18 8-PSK .................................6–14
Figure 6-7. Rate 21/44 BPSK and Rate 5/16 BPSK Turbo .....................................................6–15
Figure 6-8. 16-QAM Viterbi, Rate 3/4 and Rate 7/8 with 220,200 R-S Outer Code................6–16
Figure 9-1. Transponder Utilization with and without CnC........................................................9–3
Figure A-1. Power Spectral Density Chart .............................................................................. A–2
Figure D-1. Adjacent Carrier: A (As Tested) and B(As Plotted) ............................................... D–2
Figure D-2. QPSK 3/4 Turbo degradation versus relative carrier spacing .............................. D–4
Figure D-3. 8-PSK 3/4 Turbo degradation versus relative carrier spacing ............................. D–4
Figure D-4. 16-QAM 3/4 Turbo degradation versus relative carrier spacing .......................... D–4
Figure D-5. Adjacent Carrier Cases......................................................................................... D–5
Figure D-6. CnC Ratio ............................................................................................................. D–6
Figure D-7. CnC Ratio For QPSK and 8-PSK.......................................................................... D–7
Figure D-8. CnC Ratio For 16-QAM......................................................................................... D–8
Figure D-9. CnC Example........................................................................................................ D–9
Figure D-10. Link With Fading At Site A ................................................................................ D–10
Figure D-11. Asymmetric Link with the Same Data Rate but Different Antennas .................. D–11
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