2 estimating psd ratio, 3 estimating psd ratio from lst – Comtech EF Data DMD-2050E User Manual
Page 88
DMD2050E Universal Satellite Modem
Theory of Operation
MN-DMD2050E Revision 2
3–46
3.11.12.2
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) = 01.74 – (-29.99) = -1.75 dB
3.11.12.3
Estimating PSD Ratio from LST