C/N Ratio at Low Carrier Frequencies in R&S®SFQ

The main parameter for determining transmission quality is the C/N ratio, C representing the carrier power in the transmission channel and N the noise power added to the IF/RF signal. The noise normally has a Gaussian distribution and can be considered to be white noise. Since the noise is added to the total channel bandwidth during the transmission, there is no correlation between the noise components in the upper and the lower sidebands in the case of DVB. After demodulation, white noise is again obtained.