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Comtech EF Data CDM-625 - Estimating PSD Ratio; Estimating PSD Ratio from LST

Comtech EF Data CDM-625
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CDM-625 Advanced Satellite Modem Revision 13
DoubleTalk
Carrier-in-Carrier Option MN-CDM625
1018
10.5.2 Estimating PSD Ratio
PSD can be estimated from a link budget using Downlink EIRP and Symbol Rate:
PSD = Downlink EIRP – 10 * Log (Symbol Rate)
PSD Ratio Example:
Carrier
Downlink EIRP
Symbol Rate
Power Spectral Density
A to B
27 dBW
500 ksps
-29.99 dBW/Hz
B to A
24 dBW
375 ksps
-31.74 dBW/Hz
PSD Ratio (@ A) = -29.99 – (-31.74) = 1.75 dB
PSD Ratio (@ B) = -31.74 – (-29.99) = -1.75 dB
10.5.2.1 Estimating PSD Ratio from LST

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