Comtech EF Data CDM-570A Installation And Operation Manual page 601

CnC Ratio
Ratio of Interfering Carrier Power to Desired Carrier Power (unit in dB).
The Interfering Carrier is the Tx Carrier from local modulator; the Desired Carrier is the carrier
from the distant end received by the local demodulator.
At the station transmitting C1: CnC Ratio (in dB) = PowerC1 (in dBm) – PowerC2 (in dBm)
Eb/No
Ratio of Energy per bit (Eb) to Noise density (No) (unit in dB):
•
Eb/No = C/No – 10log(DR) [where DR is the Data Rate]
•
Eb/No = Es/No – 10log(SE) [where SE is Spectral Efficiency]
Es/No
Ratio of Energy per symbol (Es) to Noise density (No) (unit in dB):
•
Es/No = C/No – 10log(SR) [where SR is the Symbol Rate]
•
Es/No = Eb/No + 10log(SE) [where SE is Spectral Efficiency]
C/N
Ratio of Carrier Power (C) to Noise (N) (unit in dB):
Equivalent to Es/No when calculated in the Symbol Rate bandwidth.
C/No
Ratio of Carrier Power (C) to Noise Density (N
Co+No/No
Ratio of Carrier Density (C
C/N = C/N – 10log(B) [where B is bandwidth in Hz]
o
E /N = C/N – 10log(DR) [where DR is data rate in bits/sec]
b o o
= C/N + 10log(B) – 10log(DR)
= C/N – 10log(SE) [where SE is Spectral Efficiency]
E /N = 10log (10
b o
[Note: Spectral Efficiency is in bps / Hz]
DoubleTalk Carrier-in-Carrier Option
CDM-570A/570AL Satellite Modem with Optional Packet Processor
) + Noise (N
o
((Co+No/No)/10)
– 1) – 10log(SE) [where SE is Spectral Efficiency]
) (unit in dBHz)
o
) to Noise Density (N
o o
G–35
Revision 5
) (unit in dB):
MN-CDM570A